Geometry Scripting Reference

Copy Mesh From Static Mesh

Extracts a Dynamic Mesh from a Static Mesh Asset.

Copy Mesh To Static Mesh

Updates a Static Mesh Asset with new geometry converted from a Dynamic Mesh.

Copy Mesh From Component

Extracts a Dynamic Mesh Actor from any supported Component type, in World or Local space.

Create New Volume From Mesh

Creates a new Volume Actor, such as a Blocking Volume, from a Dynamic Mesh Actor.

Create New Static Mesh Asset From Mesh

Creates a new Static Mesh Asset from a Dynamic Mesh Actor.

Set Static Mesh Collision From Mesh

Generates Simple Collision shapes for a Static Mesh Asset based on the input Mesh.

Set Dynamic Mesh Collision From Mesh

Generate Simple Collision shapes for a Dynamic Mesh Component based on the input Mesh.

Copy Collision Meshes From Object

Extracts the Collision Geometry from From Object and copies it with meshes stored in To Dynamic Mesh.

• For Simple Collision, From Object can be a Static Mesh Asset or any Primitive Component.

• For Complex Collision, From Object can be a Static Mesh Asset, Static Mesh Component, or Dynamic Mesh Component.

Reset Dynamic Mesh Collision

Clears Simple Collisions from the Dynamic Mesh Component.

Copy Mesh From Skeletal Mesh

Copies the Skeletal Mesh into the target Dynamic Mesh.

Copy Mesh To Skeletal Mesh

Copies the given Dynamic Mesh to the Skeletal Mesh.

Create New Skeletal Mesh Asset From Mesh

Create a new Skeletal Mesh Asset from the Target Mesh.

Check Static Mesh Has Available LOD

Checks if a Static Mesh Asset has the RequestedLOD available. That is if Copy Mesh From Static Mesh will be able to succeed for the given LODType and LODIndex.

Get Num Static Mesh LODs Of Type

Determines the number of available LODs of the requested LODType in a static mesh asset.

Determine Mesh Occlusion

Determines which meshes are entirely hidden by other meshes in the set, when viewed from outside.

Get LOD Material List From Skeletal Mesh

Extracts the Material List and corresponding Material Indices from the specified LOD of the skeletal mesh asset.

Get Material List From Static Mesh

Gets the asset materials from the static mesh asset.

Get Material List From Skeletal Mesh

Get the asset materials from the skeletal mesh asset.

Convert Material Map To Material List

Converts material map to a material list and a slot names list. Null materials will be kept in the list, and the list will have the same number of elements as the map.

Convert Material List To Material Map

Converts material list and slot names list to material map, which is the format expected by CreateNewSkeletalMeshAssetFromMesh.

Copy Morph Target To Skeletal Mesh

Add a Dynamic Mesh morph target to a skeletal mesh asset.

Copy Skin Weight Profile To Skeletal Mesh

Add a Dynamic Mesh skin weight profile to a Skeletal Mesh Asset.

Append Box

Adds a 3D box to a specified Dynamic Mesh.

Append Sphere Lat Long

Adds a 3D Sphere triangulated using latitude/longitude topology to a Dynamic Mesh.

Append Sphere Box

Adds a 3D sphere triangulated using box topology to a Dynamic Mesh.

Append Capsule

Adds a 3D Capsule to a Dynamic Mesh.

Append Cylinder

Adds a 3D Cylinder (with optional end caps) to a Dynamic Mesh.

Append Cone

Adds a 3D cone to a Dynamic Mesh.

Append Torus

Adds a 3D torus (donut) or partial torus to a Dynamic Mesh.

Append Rectangle XY

Adds a planar Rectangle to a Dynamic Mesh.

Append Round Rectangle XY

Adds a planar Rectangle with Rounded Corners (RoundRect) to a Dynamic Mesh.

Append Disc

Adds a planar disc to a Dynamic Mesh.

Append Triangulated Polygon

Adds a Delaunay triangulation of a planar 2D polygon to a Dynamic Mesh.

Append Revolve Polygon

Adds the surface-of-revolution of a 2D polygon, full or optionally-capped partial revolution to a Dynamic Mesh.

Append Spiral Revolve Polygon

Revolves a 2D polygon on a helical path, like one used to create a vertical spiral.

Append Revolve Path

Revolves an open 2D path, with optional top and bottom end caps.

Append Simple Extrude Polygon

Extrudes a 2D polygon along a vertical path using a selected Dynamic Mesh.

Append Simple Swept Polygon

Sweeps a 2D polygon along an arbitrary 3D path using a selected Dynamic Mesh.

Append Linear Stairs

Adds a linear staircase using a selected Dynamic Mesh.

Append Curved Stairs

Adds a rising circular staircase using a selected Dynamic Mesh.

Append Mesh Transformed

Applies each transform to Append Mesh, then adds its geometry to the Target Mesh.

Append Sweep Polygon

Sweeps and rotates a 2D polygon along the Sweep Path to create a 3D mesh that appends to the provided mesh.

Append Voronoi Diagram 2D

Generates triangulated Voronoi Cells from the provided Voronoi Sites, identifying each with PolyGroups, and appends to the provided mesh.

Append Sweep Polyline

Sweep the given 2D Polyline Vertices along the Sweep Path specified as a set of FTransforms. If the 2D vertices are (U,V), then in the coordinate space of the FTransform, X points "along" the path, Y points "right" (U), and Z points "up" (V).

Append Bounding Box

Adds a 3D box to the Target Mesh with dimensions and origin taken from the input Box.

Append Delaunay Triangulation 2D

Generates a Delaunay Triangulation of the provided vertices, and appends it to the Target Mesh.

Append Polygon List Triangulation

Generates a Delaunay Triangulation of the provided Polygon List, and appends it to the Target Mesh.

Append Triangulated Polygon 3D

Appends a Triangulated Polygon (with vertices specified in 3D) to the Target Mesh. Uses Ear Clipping-based triangulation. Output vertices will always be 1:1 with input vertices. Polygon endpoint is not repeated.

Append Simple Collision Shapes

Appends Simple Collision shapes to the Target Mesh, triangulated as specified by Triangulation Options.

Append Sphere Covering

Appends the spheres in the Sphere Covering to the Target Mesh.

Append Box With Collision

Appends a 3D box to the Target Mesh and creates matching simple collision.

Append Bounding Box With Collision

Appends a 3D box to the Target Mesh with dimensions and origin taken from the input Box. Also creates matching simple collision.

Append Sphere Lat Long With Collision

Appends a 3D Sphere triangulated using latitude/longitude topology to the Target Mesh. Also creates matching simple collision.

Append Sphere Box With Collision

Appends a 3D sphere triangulated using box topology to the Target Mesh. Also creates matching simple collision.

Append Capsule With Collision

Appends a 3D Capsule to the Target Mesh. Also creates matching simple collision.

Create Constrained Edges Loop

Intended for use with Append Delaunay Triangulation 2D. Create a loop of edges through sequential vertices. For example, a Loop (3,0) constructs edges (2,0), (0,1) and (1,2).

Create Constrained Edges Chain

Intended for use with Append Delaunay Triangulation 2D. Create a chain of edges through sequential vertices. For example, a Chain (3,0) will construct edges (0,1) and (1,2).

Translate Mesh

Applies a translation to the vertices of a Mesh.

Scale Mesh

Applies a scale transformation to the vertices of a Mesh.

Transform Mesh

Applies an arbitrary FTransform to the vertices of a Mesh.

Apply Bend Warp To Mesh

Applies a bend warp around an axis defined by a Transform.

Apply Twist Warp To Mesh

Applies a twist warp around an axis defined by a Transform.

Apply Flare Warp To Mesh

Applies a Flare or Bulge warp.

Apply Math Warp To Mesh

Applies various simple math-function-based warps, currently a 1D or 2D sine-wave with arbitrary orientation.

Apply Perlin Noise To Mesh

Applies a 3D Perlin noise displacement to the entire mesh or regions of the mesh defined by optional Selection.

Apply Iterative Smoothing To Mesh

Applies several mesh smoothing iterations to the entire mesh or a subset defined by the optional Selection

Apply Displace From Texture Map

Applies a displacement to a Dynamic Mesh based on a Texture2D and a UV channel.

Rotate Mesh

Rotates the mesh relative to the specified origin.

Translate Pivot To Location

Set the Pivot Location for the Mesh. Since the Pivot of a Mesh object is always the point at (0,0,0), this function simply translates the mesh by -PivotLocation.

Make Transform From Z Axis

Create a transform at the given location, with the ZAxis vector as the Z-axsis of the transform, and the X or Y axis oriented to the tangent vector, based on the bTangentIsX parameter.

Make Transform From Axes

Create a transform at the given location, with the ZAxis vector as the Z-axsis of the transform, and the X or Y axis oriented to the Tangent vector, based on the bTangentISX parameter.

Get Transform Axis Vector

Get the vector for the direction of the X, Y, and Z axis of the transform.

Get Transform Axis Ray

Get the ray at the transform location aligned with the direction of the X,Y, and Z-axis of the transform.

Get Transform Axis Plane

Get the plane at the transform location with the plane normal aligned with the direction of the X,Y, and Z-axis of the transform.

Copy Mesh To Mesh

Copies the mesh from one Dynamic Mesh into another.

Get Sub Mesh From Mesh

Copies a list of triangles from one Dynamic Mesh to another.

Split Mesh By Components

Separates a mesh into parts, one for each connected component, drawn from a Dynamic Mesh Pool.

Split Mesh By Material IDs

Separates a mesh into parts, one for each Material ID, drawn from a Dynamic Mesh Pool.

Append Mesh

Adds the geometry from one mesh to another, with optional Transform.

Append Mesh Repeated

Adds the geometry from one mesh to another based on the number of times it should repeat, accumulating a transform each time. This operation is useful for making patterns.

Split Mesh By Vertex Overlap

Creates a new mesh for each vertex-connected or vertex-overlapping part of Target Mesh.

Sort Meshes By Volume

Sorts meshes by their volume.

Sort Meshes By Area

Sorts meshes by their surface area.

Sort Meshes By Bounds Volume

Sorts meshes by their axis-aligned bounding box volume.

Sort Meshes By Custom Values

Sorts meshes according to the values in a second array, which must have the same length as the Meshes array.

For example, if the values array is [3, 2, 1], with Ascending Sort Order, the Meshes array would be reversed.

Apply Mesh Boolean

Applies a Boolean operation (such as, Union, Intersect, and Subtract) to a Dynamic Mesh based on a second mesh.

Apply Mesh Plane Cut

Applies a plane cut to a mesh, optionally filling any holes created.

Apply Mesh Plane Slice

Slices a mesh into two halves, with optional hole filling.

Apply Mesh Mirror

Mirrors a mesh across a plane, with optional cutting and welding of triangles.

Apply Mesh Offset

Moves the vertices of a mesh to an offset surface.

Apply Mesh Shell

Moves a copy of the mesh's triangles to an offset surface, and stitches them to the original triangles. For example, to create a thickened shell.

Apply Mesh Extrude

Extrudes the triangles of a mesh along a constant direction. For example, it creates a solid from an open triangulated polygon.

Apply Mesh Solidify

Replaces the mesh with a voxelized-and-meshed approximation (VoxWrap operation).

Apply Mesh Morphology

Replaces the mesh with an SDF-based offset mesh approximation.

Apply Mesh Self Union

An object performs a Boolean Union operation with itself, computing actions such as repairing self-intersections and removing floating geometry.

Apply Mesh PolyGroup Bevel

Applies Mesh Bevel operation to all PolyGroup Edges.

Apply Mesh Disconnect Faces Along Edges

Disconnects triangles of Target Mesh along the edges of the Selection. The input Selection still identifies the same geometric elements after disconnecting.

Apply Mesh Bevel Edge Selection

Applies a Mesh Bevel operation to parts of Target Mesh using the Bevel Options settings.

  Apply Mesh Iso Curves

Inserts edges along the curve where the interpolated per-vertex values match a given iso value.

Invert Mesh Selection

Invert the selection on the Target Mesh.

Create Select All Mesh Selection

Creates a selection of the given selection type containing all the elements of the Target Mesh

Convert Mesh Selection

Converts a mesh selection to a different type.

By default, vertices map to triangles within a one-ring neighborhood, and triangles to all contained vertices.

Combine Mesh Selections

Combines two mesh selections into a new mesh selection. The two inputs, Selection A and Selection B must have the same type.

Convert Index Array To Mesh Selection

Creates a mesh selection from the Index Array.

Convert Index Set To Mesh Selection

Creates a mesh selection from the Index Set.

Convert Mesh Selection To Index Array

Converts a mesh selection to an Index Array.

Convert Index List To Mesh Selection

Creates a mesh selection from the Index List. For cases where the Index List Type does not match the Selection Type, Convert mesh selection with bAllowPartialInclusion=true is used to convert.

Convert Mesh Selection To Index List

Converts a mesh selection to an Index List.

Select Mesh Elements In Box

Creates a new mesh selection of the Selection Type for the Target Mesh by finding all elements contained in the Box.

Select Mesh Elements In Box With BVH

Create a new Mesh Selection of the Selection Type for the Target Mesh by finding all elements contained in the Box. Similar to Select Mesh Elements In Box but takes a BVH to make it work faster.

Select Mesh Elements In Sphere

Creates a new mesh selection of the Selection Type for the Target Mesh by finding all elements contained in the Sphere.

Select Mesh Elements With Plane

Creates a new mesh selection of the Selection Type for the Target Mesh by finding all elements on one side of the plane, particularly the side that the surface normal of a Plane points towards.

Select Mesh Elements By Normal Angle

Creates a new mesh selection of the Selection Type for the Target Mesh by finding all elements that have a normal vector that is within an angular deviation threshold from the given Normal.

For Triangle and PolyGroup selections the triangle facet normal is used, for Vertex selections the per-vertex averaged normal is used.

Select Mesh Elements Inside Mesh

Creates a new mesh selection of the Selection Type for the Target Mesh by finding all elements inside a second Selection Mesh.

Expand Mesh Selection To Connected

Expands the Selection on the Target Mesh to connected regions and returns the New Selection.

Get Mesh Selection Bounding Box

Gets the 3D Bounding Box of a mesh selection.

Get Mesh Selection Boundary Loops

Computes the set of Vertex Loops bordering a mesh selection. Both the 3D polylines and lists of vertex indices are returned for each Loop.

Get Mesh Selection Info

Queries information about a mesh selection.

Debug Print Mesh Selection

Prints information about the mesh selection to the Output Log.

Expand Contract Mesh Selection

Grow or shrink the Selection on the Target Mesh to connected neighbors.

Get Mesh Unique Selection Info

Queries information about a Mesh Selection, and get a count of unique selected elements

Select Mesh Elements By Material ID

Creates a Selection of the Selection Type that contains all mesh elements referencing triangles with the given Material ID.

Select Mesh Elements By Polygroup

Creates a Selection of the SelectionType that contains all mesh elements referencing triangles with the given PolyGroup ID in the given GroupLayer.

Select Mesh Sharp Edges

Creates a new Selection, for the Target Mesh, of all sharp edges where the edge's adjacent triangle normals differ by at least MinAngleDeg.

Select Mesh Boundary Edges

Create a new Selection, for the TargetMesh, of all mesh boundary edges.

Select Selection Boundary Edges

Create a new BoundarySelection, for the TargetMesh, of the edges on the boundary of another Selection.

Select Mesh Split Normal Edges

Creates a new Selection, for the Target Mesh, of all edges seams in the mesh normal topology. That is, where normals can be different across the edge.

Select Mesh UV Seam Edges

Creates a new Mesh Selection of UV seam edges for the Target Mesh.

  Select Mesh PolyGroup Boundary Edges

Creates a new Mesh Selection of PolyGroup boundary edges for the Target Mesh. 

Transform Mesh Selection

Applies the given transform to the selected part of the mesh.

Translate Mesh Selection

Applies the given translation to the selected part of the mesh.

Rotate Mesh Selection

Rotates the selected part of the mesh relative to the specified origin.

Scale Mesh Selection

Applies the given scale to the selected part of the mesh.

Inverse Transform Mesh

Applies the inverse of the provided transform to the Target Mesh.

Inverse Transform Mesh Selection

Applies the inverse of the given transform to the vertices identified by the Selection of the Target Mesh.

Set Material ID For Mesh Selection

Sets a new Material ID on all the triangles of the given Selection.

Set PolyGroup For Mesh Selection

Sets a new PolyGroup on all the triangles of the given Selection, for the given Group Layer.

Apply Mesh Disconnect Faces

Disconnects the triangles of the Target Mesh identified by the Selection.

Apply Mesh Duplicate Faces

Duplicates the triangles of the Target Mesh identified by the Selection input.

Apply Mesh Linear Extrude Faces

Applies Linear Extrusion to the triangles of Target Mesh identified by the Selection.

Apply Mesh Offset Faces

Applies an Offset to the faces of the Target Mesh identified by the Selection, or all faces if Selection is empty.

Apply Mesh Inset Outset Faces

Applies an Inset or Outset to the faces of Target Mesh identified by the Selection, or all faces if the Selection is empty.

Apply Mesh Bevel Selection

Applies a Mesh Bevel operation to parts of Target Mesh using the Bevel Options settings.

Apply PolyGroup Catmull Clark SubD

Apply Catmull Clark Subdivision to the PolyGroup Topology of the mesh (discards input triangulation).

Apply Triangle Loop SubD

Apply Loop Subdivision to the input mesh.

Apply Selective Tessellation

Tessellate the specified mesh selection using the indicated Pattern Type.

Apply PN Tessellation

Apply point-normal tessellation to the input mesh.

Apply Uniform Tessellation

Apply a uniform tessellation to the input mesh.

Apply Simplify To Triangle Count

Simplifies the mesh until a target triangle count is reached.

Apply Simplify To Vertex Count

Simplifies the mesh until a target vertex count is reached.

Apply Simplify To Tolerance

Simplifies the mesh to a target geometric tolerance. For example, any further simplification would result in a deviation from the input mesh larger than the tolerance.

Apply Simplify To Planar

Simplifies planar areas of the mesh that have more triangles than necessary.

Apply Simplify To PolyGroup Topology

Simplifies the mesh down to the PolyGroup Topology. For example, the high-level faces of the mesh PolyGroups. Another example would be on a default Box-Sphere where simplifying to PolyGroup topology produces a box.

  Apply Editor Simplify To Triangle Count

Simplifies the mesh until a target triangle count is reached, using the UE Editor's standard mesh simplifier. Editor only.

  Apply Editor Simplify To Vertex Count

Simplifies the mesh until a target vertex count is reached, using the UE Editor's standard mesh simplifier. Editor only.

Make Box From Center Size

Create a box from a center point, and X, Y, and Z dimensions.

Make Box From Center Extents

Create a box from a center point and X, Y, and Z extents. Extents are half-dimensions.

Get Box Center Size

Get the center point, and X, Y, and Z dimensions of a box.

Get Box Corner

Get the position of a corner of the box. Corners are indexed from 0 to 7, using an ordering where:

• 0 is the Min corner

• 1/2/3 are +Z/+Y/+X from the Min corner

• 7 is the Max corner

• 4/5/6 are -Z/-Y/-X from the Max corner

Get Box Face Center

Get the position of the center of a face of a box. Faces are indexed from 0 to 5, using an ordering where:

• 0 and 1 are the MinZ and MaxZ faces

• 2 and 3 are MinY and MaxY

• 4 and 5 are MinX and MaxX

Get Box Volume Area

Get the volume and surface area of a box.

Get Expanded Box

Get the input box expanded by adding the Expand By parameter to both the Min and Max. Dimensions will be clamped to the center point if any of the Expand By parameters are larger than half the box size.

Get Transformed Box

Apply the input transform to the corners of the input box, and return the new box containing those points.

Test Box Box Intersection

Test if box 1 and box 2 intersect.

Find Box Box Intersection

Find the box formed by the intersection of box 1 and box 2.

Get Box Box Distance

Calculate the minimum distance between box 1 and box 2.

Test Point Inside Box

Test if a point is inside the box; returning true if so, otherwise false.

Find Closest Point On Box

Find the point on the faces of the box that is closest to the input point. If the point is inside the Box, it is returned.

Get Box Point Distance

Calculate the minimum distance between the box and the point.

Test Box Sphere Intersection

Check if the box intersects a sphere defined by the Sphere Center and Sphere Radius.

Flip Normals

Flips the mesh normals by reversing the orientation of each face.

Set Per Vertex Normals

Sets the mesh normals to per-vertex normals. For example, no split normals at any vertex.

Set Mesh To Facet Normals

Sets the mesh normals to per-face/triangle normals. For example, split normals along every edge of the mesh.

Compute Split Normals

Computes split-normals for the mesh based on an angle tolerance and/or other factors such as PolyGroup topology.

Recompute Normals

Recomputes the existing mesh normals. Preserves existing split normals. For use after mesh deformations, for example.

Compute Tangents

Recomputes tangents for the mesh (various methods).

Set Mesh Per Vertex Normals

Set all normals in the Target Mesh Normals Overlay to the specified per-vertex normals.

Get Mesh Has Tangents

Check if the target mesh has a Tangents Attribute Layer enabled.

Discard Tangents

Remove any existing Tangents Attribute Layer from the Target Mesh.

Compute Tangents

Recompute tangents for the Target Mesh, using the method specified by

Set Mesh Per Vertex Tangents

Set all tangents in the Target Mesh Tangents Overlays to the specified per-vertex tangents.

Get Mesh Per Vertex Tangents

Compute the interpolated Position, A * Vertex1 + B * Vertex2 + C * Vertex3, where (A,B,C) = BarycentricCoords and the Vertex positions are taken from the specified TriangleID of the target mesh.

Update Vertex Normal

Update the Normals and Tangents at VertexD of the Target Mesh.

Recompute Normals For Mesh Selection

Recompute the normals of Target Mesh on all the triangles/vertices of the given Selection using the given Calculate Options. This method will preserve any existing hard edges, that is each shared triangle-vertex normal is recomputed by averaging the face normals of triangles that reference that shared triangle-vertex normal.

Set Split Normals Along Selected Edges

Set or remove split normals (aka sharp normals) for all edges in the Selection.

Flip Triangle Selection Normals

Inverts the normal vectors of the triangles in a given selection of Target Mesh. For edge or vertex selections, normals for the triangles touching the selected edges or vertices will be flipped.

Compact Mesh

Compacts the mesh's vertices and triangles to remove any "holes" in the Vertex ID or Triangle ID lists (see discussion in Low-Level Mesh Queries section).

Discard Mesh Attributes

Removes the Attribute Set from a Dynamic Mesh, such as all UVs, Normals, Material IDs, Vertex Colors, and extended PolyGroup Layers. Note that this may prevent many functions from working.

Auto Repair Normals

This function tries to automatically reorient the Normals of a mesh so that they are consistent, such as fixing flipped normals.

Weld Mesh Edges

Welds any open boundary edges of the mesh together if possible in order to remove "cracks."

Fill All Mesh Holes

Tries to fill all open boundary loops (such as holes in the geometry surface) of a mesh.

Remove Small Components

Removes connected components of the mesh that have a volume, area, or triangle count below a threshold.

Remove Hidden Triangles

Removes any triangles in the mesh that are not visible from the exterior view, under various definitions of "visible" and "outside."

Resolve Mesh TJunctions

Attempts to resolve t-junction in the Target Mesh.

Split Mesh Bowties

Splits vertices in the Target Mesh that otherwise produce a bowtie where only a single vertex connects regions of the mesh.

Repair Mesh Degenerate Geometry

Modifies the Target Mesh by deleting small triangles or merging triangles until all edges are greater than a specified minimum length.

Remove Unused Vertices

Remove vertices that are not used by any triangles.

Snap Mesh Open Boundaries

Snap vertices on open edges to the closest compatible open boundary, if found within the tolerance distance.

Get Vertex Count

Gets the number of vertices in the mesh.

Get Num Vertex IDs

Gets the number of Vertex IDs in the mesh, which may be larger than the Vertex Count, if the mesh is not dense. For example, after deleting vertices.

Is Valid Vertex ID

Returns true if a Vertex ID refers to a valid vertex.

Get All Vertex IDs

Returns an IndexList of all Vertex IDs in mesh.

Get Vertex Position

Gets the 3D position of a mesh vertex, by Vertex ID.

Get All Vertex Positions

Returns a Vector List of all the mesh vertex positions. This list may be extensive.

Get Triangle Count

Returns the number of triangles in the mesh. Note that this is a function on the Dynamic Mesh directly.

Get Num Triangle IDs

Gets the number of Triangle IDs in the mesh. The number may be larger than the Triangle Count if the mesh is not dense, even after deleting triangles.

Is Valid Triangle ID

Returns true if a TriangleID refers to a valid Triangle.

Get All Triangle IDs

Returns an Index List of all Triangle IDs in a mesh.

Get Triangle Indices

Returns the vertex indices triplet for a Triangle.

Get All Triangle Indices

Returns a TriangleList of all Triangle indices triplets in a mesh.

Get Triangle Positions

Returns the three corner positions for a Triangle.

Get Triangle Face Normal

Returns the face/facet normal of a Triangle.

Get Triangle UVs

Returns the three corner UVs for a Triangle.

Get Triangle Material ID

Returns the current Material ID for a Triangle.

Get All Triangle Material IDs

Returns an Index List of all triangle Material IDs.

Get Triangle PolyGroup ID

Returns the current PolyGroup ID for a Triangle, in a given PolyGroup layer.

Get Has Vertex ID Gaps

Returns true if there are gaps in the Vertex ID list. For example, Get Number of Vertex IDs is greater than Get Vertex Count.

Get Has Triangle ID Gaps

Returns true if there are gaps in the Triangle ID list, such that Get Num Triangle IDs is greater than Get Triangle Count.

Get Is Dense Mesh

Returns true if the mesh is dense. For example, no gaps in Vertex IDs or Triangle IDs.

Get Mesh Has Attribute Set

Returns true if the mesh has an Attribute Set enabled to store UVs, Normals, Material IDs, and Vertex Colors. This is generally enabled by default.

Get Interpolated Triangle Position

Compute the interpolated Position, A * Vertex1 + B * Vertex2 + C * Vertex3, where (A,B,C) = BarycentricCoords and the Vertex positions are taken from the specified TriangleID of the target mesh.

Compute Triangle Barycentric Coords

Compute the barycentric coordinates (A,B,C) of the Points relative to the specified TriangleID of the Target Mesh.

Get Interpolated Triangle UV

Compute the interpolated UV, A * UV1 + B * UV2 + C * UV3, where (A,B,C) = BarycentricCoords and the UV positions are taken from the specified TriangleID in the specified UV Channel of the Target Mesh.

Get Triangle Normals

For the specified TriangleID of the Target Mesh, get the Normal and Tangent vectors at each vertex of the Triangle. These Normals and Tangents will be taken from the Normal and Tangents Overlays.

Get Interpolated Triangle Normal

Compute the interpolated Normal, A * Normal1 + B * Normal2 + C * Normal3, where (A,B,C) = BarycentricCoords and the Normals are taken from the specified TriangleID in the Normal layer of the Target Mesh.

Get Triangle Normal Tangents

For the specified TriangleID of the Target Mesh, get the Normal and Tangent vectors at each vertex of the Triangle. These Normals and Tangents will be taken from the Normal and Tangents Overlays.

Get Interpolated Triangle Normal Tangents

Compute the interpolated Normal and Tangents for the specified TriangleID in the Normal and Tangent attributes of the Target Mesh.

Get Has Vertex Colors

Return true if the Target Mesh has the Vertex Colors attribute enabled.

Get Triangle Vertex Colors

For the specified TriangleID of the Target Mesh, get the Vertex Colors at each vertex of the Triangle. These Colors will be taken from the Vertex Color Attribute.

Get Interpolated Triangle Vertex Color

Compute the interpolated Vertex Color, A * Color1 + B * Color2 + C * Color3, where (A,B,C) = BarycentricCoords and the Colors are taken from the specified TriangleID in the Vertex Color layer of the Target Mesh.

Get All Vertex Positions At Edges

Returns the vertex positions for each edge in the given index list.

Get Mesh UV Area

Gets the area of triangles in UV space for the given UV Channel.

Get All UV Seam Edges

Returns all edge element IDs that are UV seam edges for a given UV channel.

Get Num UV Islands

Returns the number of UV islands in a given UV channel.

Set Vertex Position

Sets the 3D position of a mesh vertex.

Add Vertex To Mesh

Adds a new vertex to the mesh and returns a new Vertex ID.

Add Vertices To Mesh

Adds a list of vertices to the mesh.

Delete Vertex From Mesh

Removes a vertex from the mesh.

Delete Vertices From Mesh

Removes a list of vertices from the mesh.

Add Triangle To Mesh

Adds a triangle (3-element Vertex ID tuple) to the mesh.

Add Triangles To Mesh

Adds a list of triangles to the mesh.

Delete Triangle From Mesh

Removes a triangle from the mesh.

Delete Triangles From Mesh

Removes a list of triangles from the mesh.

Delete Triangles In PolyGroup

Deletes all triangles from the mesh that have a particular PolyGroup, in a specific PolyGroup layer.

Append Buffers To Mesh

Adds a set of vertices/triangles to the mesh, with attributes such as Normals and UVs. Similar to Create Mesh Section in Proc Mesh Component.

Set Mesh Triangle Normals

Sets the Normals of a mesh triangle.

Set Mesh Triangle UVs

Sets the UVs of a mesh triangle.

Set Triangle Material ID

Sets the Material ID of a mesh triangle.

Set All Mesh Vertex Positions

Set all vertex positions in the Target Mesh to the specified positions.

Append Mesh With Materials

Apply Append Transform to Append Mesh and then add its geometry to the Target Mesh. Also combines materials lists of the Target and Append meshes, and updates the output mesh materials to reference the combined list.

Append Mesh Transformed With Materials

For each transform in AppendTransforms, apply the transform to AppendMesh and then add its geometry to the TargetMesh Also combines materials lists of the Target and Append meshes, and updates the output mesh materials to reference the combined list.

Append Mesh Repeated With Materials

Repeatedly apply AppendTransform to the AppendMesh, each time adding the geometry to TargetMesh. Also combines materials lists of the Target and Append meshes, and updates the output mesh materials to reference the combined list.

Merge Mesh Vertex Pair

Attempts to merge together two vertices, and report whether they were merged.  

Merge Mesh Vertices In Selections

Attempts to merge together vertices in one selection to their closest vertices in the second selection, within a distance threshold.

Get Index List Length

Returns the number of items in the Index List.

Get Index List Last Index

Returns the index of the last item in the Index List.

Get Index List Item

Returns the item stored in the Index List at the specified location.

Set Index List Item

Updates the value of the item stored in the Index List at the specified location.

Convert Index List To Array

Converts an Index List to an array of integers.

Convert Array To Index List

Converts an array of integers to an Index List.

Duplicate Index List

Duplicates the contents Index List into Duplicate List.

Clear Index List

Resets all the items in the Index List to the Clear Value.

Get Scalar List Length

Returns the number of items in the Scalar List.

Get Scalar List Last Index

Returns the index of the last item in the Scalar List.

Get Scalar List Item

Returns the Scalar (double) stored in the Scalar List at the specified location.

Set Scalar List Item

Updates the value of the Scalar stored in the Scalar List at the specified location.

Convert Scalar List To Array

Converts a Scalar List to an array of doubles.

Convert Array To Scalar List

Converts an array of doubles to a Scalar List.

Duplicate Scalar List

Copies the contents of Scalar List into Duplicate List.

Clear Scalar List

Reset all the items in the Scalar List to the Clear Value.

Get Vector List Length

Returns the number of items in the Vector List.

Get Vector List Last Index

Return the index of the last item in the Vector List.

Get Vector List Item

Return the FVector stored in the VectorList at the specified location.

Set Vector List Item

Updates the value of the FVector stored in the Vector List at the specified location.

Convert Vector List To Array

Converts a Vector List to an array of FVectors.

Convert Array To Vector List

Converts an Array of FVectors to a Vector List.

Duplicate Vector List

Copies the contents of Vector List into Duplicate Vector List.

Clear Vector List

Resets all the items in the Vector List to the Clear Value.

Get UV List Length

Returns the number of items in the UV List.

Get UV List Last Index

Returns the index of the last item in the UV List.

Get UV List Item

Returns the FVector2D stored in the UV List at the specified location.

Set UV List Item

Updates the value of the FVector2D stored in the UV List at the specified location.

Convert UV List To Array

Converts a UV List to an array of FVector2Ds.

Convert Array To UV List

Converts an array of FVector2D to UVList.

Duplicate UV List

Duplicates the contents of UV List into Duplicate List.

Get Color List Length

Returns the number of items in the Color List.

Get Color List Last Index

Returns the index of the last item in the Color List.

Get Color List Item

Returns the FLinearColor stored in the Color List at the specified location.

Set Color List Item

Updates the value of the FLinearColor stored in the Color List at the specified location.

Convert Color List To Array

Converts the Color List to an array of FLinearColor.

Convert Array To Color List

Converts an array of FLinearColor to a Color List.

Extract Color List Channel

Creates a Scalar List that corresponds to the 0,1, or 2 channel of a Color List.

Extract Color List Channels

Creates a Vector List from a Color List. The channels in the Color List are mapped to vector components by means of X Channel Index, Y Channel Index, and Z Channel Index.

Vector Length

Computes the length of each vector in Vector List A and returns the value in the Scalar List.

Vector Dot

Computes the dot-product between each pair of vectors in Vector List A and Vector List B, and returns the value in the new Scalar List.

Vector Cross

Computes the cross-product between each pair of vectors in Vector List A and Vector List B and returns the value in the new Vector List.

Vector Normalize In Place

Normalizes each vector in Vector List, and stores the value in a Vector List. If a vector is degenerate, set the normal to the Set On Failure vector.

Vector Blend

Computes ConstantA * A + ConstantB * B for each pair of vectors in Vector List A and Vector List B, and returns the value in the new Vector List.

By default this (constants = 1) adds the two vectors. Set ConstantB = -1 to subtract B from A.

You can also use the function to Linear Interpolate, by setting ConstantB = 1 - ConstantA.

Vector Blend In Place

Computes ConstantA * A + ConstantB * B for each pair of vectors in Vector List A and Vector List B, and stores the value in Vector List B.

By default this (constants = 1) adds the two vectors. Set ConstantB = -1 to subtract B from A.

You can also use the function to Linear Interpolate, by setting ConstantB = 1 - ConstantA.

Scalar Vector Multiply

Computes Scalar Multiplier * Scalar * Vector for each scalar/vector pair in the two input lists, and returns the value in a new Vector List.

Scalar Vector Multiply In Place

Computes Scalar Multiplier * Scalar * Vector for each scalar/vector pair in the two input lists, and stores the value in the input Vector List.

Constant Vector Multiply

Computes Constant * Vector for each element in the Vector List and returns the value in a new list.

Constant Vector Multiply In Place

Computes Constant * Vector for each element in Vector List, and stores the value in Vector List.

Vector To Scalar

Converts each Vector in Vector List to a Scalar by computing ConstantX * Vector.X + ConstantY * Vector.Y + ConstantZ * Vector.Z , and returns the value in a new Scalar List.

You can use it to extract the X, Y, and Z values from a Vector, or other component-wise math.

Scalar Invert

Computes Numerator / Scalar for each element of the Scalar List and returns the value in a new Scalar List.

If Abs(Scalar) < Epsilon, set to Set On Failure value.

Scalar Invert In Place

Computes Numerator / Scalar for each element of the Scalar List and stores the value in input Scalar List.

If Abs(Scalar) < Epsilon, set to Set On Failure value.

Scalar Blend

Computes ConstantA * A + ConstantB * B for each pair of values in Scalar List A and Scalar List B and returns the value in the new Scalar List.

By default this (constants = 1) just adds the two values. Set ConstantB = -1 to subtract B from A.

The function can also be used to Linear Interpolate, by setting ConstantB = 1 - ConstantA.

Scalar Blend In Place

Computes ConstantA * A + ConstantB * B for each pair of values in ScalarListA and ScalarListB and return in ScalarListB.

By default this (constants = 1) just adds the two values. Set ConstantB = -1 to subtract B from A.

Can also be used to Linear Interpolate, by setting ConstantB = ( 1 - ConstantA ).

Scalar Multiply

Computes Scalar Multiplier * A * B for each pair of values in Scalar List A and Scalar List B, and returns the values in the new Scalar List.

Scalar Multiply In Place

Computes Scalar Multiplier * A * B for each pair of values in Scalar List A and Scalar List B, and returns the values in Scalar List B.

Constant Scalar Multiply

Computes Constant * Scalar for each value in Scalar List, and returns the values in the new Scalar List.

Constant Scalar Multiply In Place

Computes Scalar Multiplier A * B for each pair of values in Scalar List A and Scalar List B, and returns the values in the current Scalar List.

Transform In Place

Transform each vector in VectorList, and store in VectorList

Vector Inverse Transform In Place

Inverse transform each vector in VectorList, and store in VectorList.

Vector Plane Project In Place

Project each vector in VectorList to the given Plane, and store in VectorList.

Compute Point Sampling

Compute a set of sample points lying on the surface of Target Mesh based on the provided sampling Options. Samples are approximately uniformly distributed, and non-overlapping relative to the provided Options.

Compute NonUniform Point Sampling

Compute a set of sample points lying on the surface of Target Mesh based on the provided sampling Options and NonUniform Options.

Compute Vertex Weighted Point Sampling

Compute a set of sample points lying on the surface of TargetMesh based on the provided sampling Options and NonUniform Options.

Compute Render Capture Cameras For Box

Compute a set of Render Capture Cameras to capture a scene within the given Box.

Compute Render Capture Point Sampling

Compute oriented sample points on the visible surfaces of the given Actors. The Samples are computed using Render Capture from the given virtual cameras.

Compute Uniform Random Point Sampling

Computes a uniform random (not uniform spacing) point sampling over the mesh surface.

Set Active Sculpt Layer

Sets the requested Layer Index as the current active sculpt layer, if possible.

Set Sculpt Layer Weight

Sets the weight of the layer at Layer Index to the requested Weight.

Set Sculpt Layer Weights Array

Sets the weights of multiple layers to match the given Weights array.Note: If the Weights array length is larger than the number of layers, will just set the weights of the existing layers. Will not add or remove layers.

Get Sculpt Layer Weights Array

Gets the weights of all sculpt layers on the mesh.

Get Num Sculpt Layers

Gets the number of sculpting layers active on the mesh.

Get Active Sculpt Layer

Gets the current sculpting layers active on the mesh, or -1 if the mesh does not have sculpting layers.

Discard Sculpt Layers

Discards all sculpt layer data, leaving current vertex positions unchanged.

Merge Sculpt Layers

Merges a range of sculpt layers together. May change the Active Sculpt Layer.

Make Ray From Points

Create a ray from two points, placing the origin at A and the direction as Normalize (B-A).

Make Ray From Point Direction

Create a ray from an origin and direction, with optionally non-normalized direction.

Get Transformed Ray

Apply the given transform to the given ray, or optionally the Transform Inverse, and return the new transformed ray.

Get Ray Point

Get a point at the given distance along the Ray, Origin + Distance * Direction.

Get Ray Start End

Get two points along the ray.

Get Ray Parameter

Project the given point onto the closest point along the ray, and return the ray parameter and distance at that point.

Get Ray Point Distance

Get the distance from the given point to the closest point on the ray.

Get Ray Closest Point

Get the closest point on the Ray to the given point.

Get Ray Sphere Intersection

Check if the ray intersects a sphere defined by the Sphere Center and Sphere Radius. This function returns two intersection distances (ray parameters). If the ray grazes the sphere, both distances will be the same. If it misses, they will be MAX_FLOAT. Use the function Get Ray Point to convert the distances to points on the ray and sphere.

Get Ray Box Intersection

Check if the ray intersects a sphere defined by the Sphere Center and Sphere Radius.

Get Ray Plane Intersection

Find the intersection of a ray and a plane.

Get Ray Line Closest Point

Compute the pair of closest points on a 3D ray and line. The line is defined by an origin and direction, but extends infinitely in both directions.

Get Ray Segment Closest Point

Compute the pair of closest points on a 3D ray and line segment. The line segment is defined by its two endpoints.

KMeans Cluster To IDs

Use K-Means clustering to cluster the given points into a target number of clusters, and return an array with a cluster index per point.

KMeans Cluster To Arrays

Use K-Means clustering to cluster the given points into a target number of clusters, and return the clusters as an array of lists of point indices.

Downsample Points

Find a subset of the given Points of a specified size. You can optionally specify a priority weighting and/or request uniform spacing for the downsampled points.

Transforms To Points

Create an array of the positions of the input Transforms.

Offset Transforms

Offset the location of all Transforms by Offset in the given Direction, either locally in the space of the transform or in world space. For example, this can offset mesh surface samples along the surface normal direction.

Flatten Points

Convert an array of points from 3D to 2D, by transforming into the given ReferenceFrame and taking the X,Y coordinates Note that to transform into the ReferenceFrame, we apply the inverse of the ReferenceFrame's transform.

Unflatten Points

Convert an array of points from 2D to 3D, by transforming out of the given ReferenceFrame, with the given Height for the non-flat axis (default Z).

Make Bounding Box From Points

Make a Axis Aligned Bounding Box that bounds the given Points, optionally expanded by some additional amount on each side.

Get Points From Index List

Create an array of the subset of AllPoints indicated by the Indices list.

Get Has Material IDs

Returns true if the mesh has Material IDs available/enabled.

Enable Material IDs

Enables Material IDs on a mesh, initialize to 0.

Clear Material IDs

Resets all Material IDs on a mesh to 0.

Get Max Material ID

Returns the maximum Material ID currently set on a mesh.

Remap Material IDs

For all triangles with a Material ID matching a given value, and sets the Material ID to a new value.

Set All Triangle Material IDs

Sets the Material ID of all triangles in a mesh to the values in an input Index List.

Set PolyGroup Material ID

Sets the Material ID of all triangles in a mesh that have a specified PolyGroup ID (in a given PolyGroup layer) to the specified Material ID.

Remap To New Material IDs By Material

Remap the Material IDs of the Target Mesh to a new set of Material IDs based on a From/Current Material List, and a New Material List. For each triangle, the current Material is determined as FromMaterialList[MaterialID], and then the first index of this Material is found in the ToMaterialList, and this index is used as the new MaterialID. If a Material cannot be found in ToMaterialList, a warning will be printed and the MaterialID left unmodified, unless MissingMaterialID is set to a value >= 0, in which case MissingMaterialID will be assigned.

Remap And Combine Materials

Remap material IDs to be consistent with a Required Materials list. The Target Mesh material IDs will be remapped to reference the Combined Materials list, which will always start with the Required Materials.

Static Mesh Has Customized Collision

Returns true if the static mesh has customized collision. If no editor data is available, returns false.

Get Simple Collision From Component

Get the simple collision from a Primitive Component.

Set Simple Collision Of Dynamic Mesh Component

Set the simple collision on a Dynamic Mesh Component.

Get Simple Collision From Static Mesh

Get the simple collision from a Static Mesh.

Set Simple Collision Of Static Mesh

Set the simple collision on a Static Mesh.

Get Simple Collision Shape Count

Count of number of simple collision shapes.

Transform Simple Collision Shapes

Transform simple collision shapes.

Combine Simple Collision

Add simple collision shapes from Append Collision to Collision To Update.

Simplify Convex Hulls

Simplify any convex hulls in the given simple collision representation. Updates the passed-in Simple Collision.

Approximate Convex Hulls With Simpler Collision Shapes

Attempt to approximate any convex hulls in the given simple collision representation. Updates the passed-in Simple Collision. Convex hulls that aren't well approximated (to tolerances set in ApproximateOptions) will remain as convex hulls.

Merge Simple Collision Shapes

Attempt to merge collision shapes to create a representation with fewer overall shapes.

Compute Negative Space

Compute the negative space of an input mesh surface that should be protected when merging simple collision shapes.

Sphere Covering To Array Of Spheres

Return an array of the spheres in the given Sphere Covering.

Array Of Spheres To Sphere Covering

Return a sphere covering containing the spheres in the given Spheres array.

Set Static Mesh Custom Complex Collision

Sets a static mesh as the custom collision for another static mesh to use.

Reset Simple Collision

Clears the Simple Collision shapes.

Generate Collision From Mesh

Generates Simple Collision shapes for an input Dynamic Mesh shape.

Combine Simple Collision Array

Combines the SimpleCollisionArray collision shapes into a single SimpleCollision.

Compute Navigable Convex Decomposition

Computes the 'navigable' convex decomposition of an input mesh surface. That is a convex decomposition appropriate for a character of (or larger than) a given size.

Compute Mesh Convex Hull

Computes the Convex Hull of a given Target Mesh, or part of the mesh if an optional Selection is provided, and puts the result in Hull Mesh.

Compute Mesh Swept Hull

Computes the Swept Hull of a given Target Mesh for a given 3D Plane defined by ProjectionFrame, and puts the result in Hull Mesh. The Swept Hull is a linear sweep of the 2D convex hull of the mesh vertices projected onto the plane (the sweep precisely contains the mesh extents along the plane normal)

Compute Mesh Convex Decomposition

Compute a Convex Hull Decomposition of the given TargetMesh. Assuming more than one hull is requested, multiple hulls will be returned that attempt to approximate the mesh.

Set Mesh Constant Vertex Color

Sets all vertex colors to a specific color.

Set Mesh Per Vertex Colors

Sets the color for every vertex using a Color List.

Get Mesh Per Vertex Colors

Gets a list of single vertex colors for each mesh vertex in the Target Mesh, derived from the Vertex Color Overlay.

Set Mesh Selection Vertex Color

Sets the colors in the Target Mesh's Vertex Color Overlay, identified by the Selection, to a constant value.

• For a Vertex Selection, each existing Vertex Color Overlay Element for the vertex is updated.

• For a Triangle or PolyGroup Selection, all Overlay elements in the identified Triangles are updated.

Convert Mesh Vertex Colors SRGB To Linear

Apply an SRGB to Linear color transformation on all vertex colors.

Convert Mesh Vertex Colors Linear To SRGB

Apply a Linear to SRGB color transformation on all vertex colors.

Get Mesh Per Vertex Normals

Get a list of single normal vectors for each mesh vertex in the Target Mesh, derived from the Normals Overlay.

Get Mesh Per Vertex UVs

Get a list of single vertex UVs for each mesh vertex in the Target Mesh, derived from the specified UV Overlay.

Blur Mesh Vertex Colors

Blur the color attribute of the mesh. If the mesh has no color attribute, the function returns the mesh unchanged.

Transfer Vertex Colors From Mesh

Transfers the vertex colors from the Source Mesh to the Target Mesh.

 Assumes that the meshes are aligned. Otherwise, use the Transform Mesh geometry script function to align them.

Sample Texture 2D At UV Positions

Sample the given Texture Map at the list of UV positions and return the color at each position in the Color List output.

Create New Texture 2D Asset

Create a serialized Texture 2D Asset from a temporary UTexture2D.

Sample Texture Render Target 2D At UV Positions

Sample the given Texture Map at the list of UV positions and return the color at each position in Color List output. This function fetches GPU data before sampling, so, depending on your application, it can be inefficient and slow.

Bake Texture

Creates textures for the Target Mesh from data sampled in the Source Mesh.

Bake Vertex

Populates the vertex colors in the Target Mesh with the results of the baking properties of the given Source Mesh.

Bake Texture From Render Captures

Bakes textures for a target mesh from render captures.

Make Bake Type UV Shell

Generate the bake options for UV Shell.

Bake Signed Distance To Volume Texture

Write a distance field to the given existing volume texture.

Make Bake Type Height

Generates the bake options for Height data.

Get Num UV Channels

Gets the number of UV Channels on a mesh.

Set Num UV Channels

Sets the number of UV Channels on a mesh.

Get UV Set Bounding Box

Gets the 2D bounding box of all UVs in a UV Channel.

Copy UV Channel

Replaces target UV Channel with values from source UV Channel.

Translate Mesh UVs

Applies 2D Translation to all UVs, or a subset of UVs if you provide a Selection, in the UVSet Index.

Scale Mesh UVs

Applies 2D Scale to all UVs, or a subset of UVs if you provide a Selection, in the UVSet Index.

Rotate Mesh UVs

Apples 2D Rotation to all UVs, or a subset of UVs if you provide a Selection, in the UVSet Index.

Recompute Mesh UVs

Recomputes UVs for a Mesh based on different types of well-defined UV islands, such as existing UV islands, PolyGroups, or the Selection input.

Repack Mesh UVs

Packs the existing UV islands into standard UV space.

Set Mesh UVs From Planar Projection

Using Planar projection, set UVs for an entire mesh or a subset you define by the Selection input.

Set Mesh UVs From Box Projection

Using Box Projection, set UVs for an entire mesh or a subset you define by the Selection input.

Set Mesh UVs From Cylinder Projection

Using Cylinder Projection, set UVs for an entire mesh or a subset you define by the Selection input.

Auto Generate Patch Builder Mesh UVs

Computes new UVs using PatchBuilder method, and optionally pack.

Auto Generate X Atlas Mesh UVs

Computes new UVs using XAtlas, and optionally packs.

Get Mesh UVSize Info

Computes information about dimensions and areas for a UV Channel of a Mesh, with an optional mesh selection.

Get Mesh Per Vertex UVs

Gets a list of single vertex UVs for each mesh vertex in the Target Mesh, derived from the specified UV Overlay.

Copy Mesh UV Channel To Mesh

Copies the 2D UVs from the given UV Channel Index in Copy From Mesh to the 3D vertex positions in Copy To UV Mesh. PolyGroup IDs and Material IDs are preserved in the UV Mesh.

Copy Mesh To Mesh UV Channel

Transfers the 3D vertex positions and triangles of Copy From UVMesh to the given UV Channel identified by To UV Channel Index of Copy To Mesh. The 3D positions (X,Y,Z) will be copied as UV positions (X,Y).

Compute Mesh Local UV Param

Compute local UV parameterization on Target Mesh vertices around the given CenterPoint / Triangle. This method uses a Discrete Exponential Map parameterization, which unwraps the mesh locally based on geodesic distances and angles. The Center Point will have a UV value (0,0), and the computed vertex UVs will be such that ` Length(UV) == geodesic distance`.

Add UV Element To Mesh

Adds a new UV Element to the specified UV Channel of the Mesh and returns a new UV Element ID.

Set Mesh Triangle UV Element IDs

Sets the UV Element IDs for a given Triangle in the specified UV Channel, that is the UV Triangle indices. This function does not create new UVs. The UV Triangle can only be set if the resulting topology would be valid. That is the elements cannot be shared between different base Mesh Vertices, so they must either be unused by any other triangles, or already associated with the same mesh vertex in other UV triangles. If any conditions are not met, bIsValidTriangle will be returned as false.

Get Mesh Triangle UV Element IDs

Returns the UV Element IDs associated with the three vertices of the triangle in the specified UV Channel. If the Triangle does not exist in the mesh or if no UVs are set in the specified UV Channel for the triangle, bHaveValidUVs will be returned as false.

Get Mesh UV Element Position

Returns the UV Position for a given UV Element ID in the specified UV Channel. If the UV Channel or Element ID does not exist, bIsValidElementID will be returned as false.

Set Mesh UV Element Position

Sets the UV position of a specific ElementID in the given UV Channel. If the UV Channel or Element ID does not exist, bIsValidElementID will be returned as false.

Set UV Seams Along Selected Edges

Converts Selection to an Edge selection, and set or remove UV seams along all of the selected edges.

Apply Texel Density UV Scaling

Rescales UVs in the UV Channel for a Mesh to match a specified texel density, described by the options passed in. Supports processing on a subset of UVs via a non-empty Selection.

Layout Mesh UVs

Packs the existing UV islands in the specified UV Channel into standard UV space based on the Repack Options.

Transfer Mesh UVs By Projection

Copies UVs from one mesh to another, by projecting along the requested direction.

Intersects UV Box 2D

Tests two Box2D bounds for intersection, with optional support for working in a wrapped space.

Get Has PolyGroups

Returns true if the mesh has a standard PolyGroup Layer.

Enable PolyGroups

Enables standard PolyGroup Layer on a Mesh.

Get Num Extended PolyGroup Layers

Returns the count of extended PolyGroup Layers.

Set Num Extended PolyGroup Layers

Sets the number of extended PolyGroup Layers on a Mesh.

Clear PolyGroups

Resets the triangle PolyGroup assignments to a constant value for a given PolyGroup Layer.

Copy PolyGroups Layer

Copies PolyGroups from one layer to another.

Convert UV Islands To PolyGroups

Creates and assigns a new PolyGroup for each disconnected UV island of a Mesh.

Convert Components To PolyGroups

Creates and assigns a new PolyGroup for each disconnected component of a Mesh.

Compute PolyGroups From Angle Threshold

Sets PolyGroups by partitioning the mesh based on an edge crease/opening-angle.

Compute PolyGroups From Polygon Detection

Identifies polygons and assigns PolyGroup IDs.

Add Named Polygroup Layer

Adds an extended PolyGroup layer with the given name. If a layer with that name is already on the mesh, that existing layer will be returned and no new layer will be added.

 Find Extended Polygroup Layer By Name

Finds an extended PolyGroup layer by its name. If there are multiple layers with the same name, returns the first such layer.

Get PolyGroup Bounding Box

Computes the bounds of a PolyGroup.

GetPoly Group UV Bounding Box

Computes the UV bounds of a PolyGroup.

Get PolyGroup UV Centroid

Computes the UV centroid of a PolyGroup.

Mesh Has Bone Weights

Check whether the Target Tesh has a per-vertex Bone Weight attribute set.

Mesh Create Bone Weights

Create a new Bone Weights attribute on the Target Mesh, if it does not already exist. If it does exist, and bReplaceExistingProfile is passed as true, the attribute will be removed and re-added, to reset it.

Get Max Bone Weight Index

Determine the largest Bone Weight index that exists on the mesh.

Get Vertex Bone Weights

Return an array of Bone Weight at a given vertex of the Target Mesh.

Get Largest Vertex Bone Weight

Return the Bone Weight of the maximum weight at a given vertex of the Target Mesh.

Set Vertex Bone Weights

Set the Bone Weight at a given vertex of the Target Mesh.

Set All Vertex Bone Weights

Set all vertices of the Target Mesh to the given Bone Weights.

Compute Smooth Bone Weights

Computes a smooth skin binding for the given mesh to the skeleton provided.

Transfer Bone Weights From Mesh

Transfer the bone weights from the SourceMesh to the TargetMesh. Assumes that the meshes are aligned. Otherwise, use the Transform Mesh geometry script function to align them.

Copy Bones From Mesh

Copy the bone attributes (skeleton) from the Source Mesh to the Target Mesh.

Discard Bones From Mesh

Discard the bone attributes (skeleton) from the Target Mesh.

Get Bone Index

Get the index of the bone with the given name.

Get Root Bone Name

Get the name of the root bone.

Get Bone Children

Get the information about the children of the bone.

Get All Bones Info

Get an array of bones representing the skeleton. Each entry contains information about the bone.

Get Bone Info

Get the index of the bone with the given name.

Mesh Copy Bone Weights

Copies all bone weights from a source profile onto a target profile, on the same mesh, replacing all.

Blend Bone Weights

Blends two bone weights using an Alpha value that ranges from 0 to 1, inclusive.

Prune Bone Weights

Prunes the given bones from any bone weight assignment on the given profile.

Get Mesh Bounding Box

Computes the bounding box of the mesh vertices.

Get Mesh Volume Area

Computes the volume and area of the mesh.

Get Is Closed Mesh

Returns true if the mesh is closed, such as no topological boundary edges.

Get Num Open Border Loops

Returns the number of open border loops, such as "holes" in the mesh.

Get Num Open Border Edges

Returns the number of topological boundary edges in the mesh.

Get Num Connected Components

Returns the number of separate connected-components in the mesh, such as "triangle patches" connected by shared edges.

Compute Mesh Convex Hull

Computes the Convex Hull of a given Mesh, or part of the mesh you define by the Selection input, and returns in a separate mesh.

Compute Mesh Swept Hull

Computes a 2D swept-hull of the input mesh and returns in a separate mesh.

Compute Mesh Convex Decomposition

Computes a Convex Hull Decomposition of the given Target Mesh. Assuming more than one hull is requested, multiple hulls will be returned that attempt to approximate the mesh. There is no guarantee that the entire mesh is contained in the hulls.

Get Mesh Volume Area Center

Computes the volume, area, and center-of-mass of the mesh.

Get Shortest Vertex Path

Computes a vertex list that represents the shortest path constrained to travel along mesh triangle edges between the prescribed start and end vertex. This can fail if the Start and End points are within separate connected components of the mesh.

Get Shortest Surface Path

Computes a polypath that represents the shortest mesh surface path between two prescribed points on the provided mesh.This can fail if the Start and End points are within separate connected components of the mesh.

Create Surface Path

Computes a polypath that represents a "straight" surface path starting at the prescribed point on the mesh, and continuing in the indicated direction until reaching the requested path length or encountering a mesh boundary, whichever comes first.

Get Global Mesh Pool

Accesses a global compute mesh pool (created on first access).

Discard Global Mesh Pool

Fully clears or destroys the current global mesh pool, allowing it and all its meshes to be garbage collected.

Request And Release Compute Mesh

Macro to request a compute mesh which can be used via the With Mesh execute pin, and then automatically released before the After Release execute pin.

Request And Release Compute Mesh From Global Pool

Macro to request and release a compute mesh using the global compute mesh pool.

Get Polygon Vertex Count

Returns the number of vertices in a simple polygon.

Get Polygon Vertex

Returns the specified vertex of a simple polygon. Vertex Index loops around, that is, -1 gives the last vertex in the polygon. If the polygon has no vertices, it returns the zero vector.

Set Polygon Vertex

Set the specified vertex of a simple polygon. Vertex Index loops around, that is, -1 gives the last vertex in the polygon. Does nothing if the polygon has no vertices.

Add Polygon Vertex

Set the specified vertex of a simple polygon. Returns the index of the added vertex.

Get Polygon Tangent

Returns a vertex's tangent of a simple polygon. Vertex Index loops around, that is, -1 gives the tangent of the last vertex in the polygon. If the polygon has no vertices, it returns the zero vector.

Get Polygon Arc Length

Returns the arc length of a simple polygon.

Get Polygon Area

Returns the area enclosed by a simple polygon.

Get Polygon Bounds

Returns the bounding box of a simple polygon.

Convert Spline To Polygon

Sample positions from a USplineComponent. into a simple polygon, based on the given Sampling Options.

Simple Polygon To Array Of Vector

Returns an array of 3D vectors with the polygon vertex locations, with Z coordinate set to zero.

Simple Polygon To Array Of Vector2D

Returns an array of 2D vectors with the polygon vertex locations.

Array Of Vector To Simple Polygon

Returns a polygon created from an array of 3D position vectors, ignoring the Z coordinate.

Array Of Vector2D To Simple Polygon

Returns a polygon created from an array of 2D position vectors.

Get Polygon Vertex Count

Returns the number of vertices in a polygon's outer shape, if Hole Index is -1, or in the specified inner hole. Returns 0 for invalid polygon or hole indices.

Get Polygon Vertex

Returns the specified vertex of a polygon — either of the outer polygon, if Hole Index is -1, or specified inner hole.Vertex are the zero vector for invalid polygon or hole indices, or if the polygon is empty. Vertex Index will loop.

Get Polygon Count

Returns the number of polygons in the Polygon List.

Get Polygon Hole Count

Returns the number of holes in a polygon. Returns zero for an invalid Polygon Index.

Get Polygon Vertices

Returns the vertices of a polygon — either of the outer polygon, if Hole Index is -1, or specified inner hole. Out Vertices are empty for invalid polygon or hole indices.

Get Polygon Area

Returns the area enclosed by a polygon. Returns zero for an invalid Polygon Index.

Get Polygon Bounds

Returns the bounding box of a polygon. Returns an empty, invalid box for an invalid Polygon Index.

Get Simple Polygon

Returns a specified simple polygon from a polygon list — either the outer polygon, if Hole Index is -1, or specified inner hole. Polygon are empty for invalid polygon or hole indices.

Get Polygon List Area

Returns the area enclosed by a polygon.

Get Polygon List Bounds

Returns the bounding box of a polygon.

Create Polygon List From Single Polygon

Create a polygon list of a single polygon, with optional holes.

Add Polygon To List

Add Polygon to a polygon list, with optional holes. Returns index of the added polygon.

Create Polygon List From Simple Polygons

Create a Polygon List from an array of Simple Polygons.

Append Polygon List

Add the polygons in Polygons to Append to Polygon List.

Polygons Union

Compute union of all polygons in Polygon List. Also resolves self-intersections within each polygon.

Polygons Difference

Compute difference of Polygon List and Polygons to Subtract.

Polygons Intersection

Compute intersection of Polygon List and Polygons to Intersect.

Polygons Exclusive Or

Compute exclusive or of Polygon List and Polygons to Exclusive Or.

Polygons Offset

Apply a single offset to a list of closed polygons.

Polygons Offsets

Apply two offsets in sequence to a list of closed polygons.

Polygons Morphology Open

Apply a morphological open operator to a list of closed polygons — first offsetting by -Offset, then by +Offset. If Offset is negative, this instead functions as a close operation.

Polygons Morphology Close

Apply a morphological close operator to a list of closed polygons — first offsetting by +Offset, then by -Offset. If Offset is negative, this instead functions as an open operation.

Create Polygons From Path Offset

Apply an offset to a single open 2D path, generating closed polygons as a result.

Get Poly Path Num Vertices

Returns the number of vertices in the poly path.

Get Poly Path Last Index

Returns the index of the last vertex in the poly path.

Get Poly Path Vertex

Returns the 3D location of the specified vertex.

Get Poly Path Tangent

Returns the local tangent vector of the poly path at the specified vertex index.

Get Poly Path Arc Length

Returns the length of the poly path.

Get Nearest Vertex Index

Returns the index of the nearest poly path vertex to the specified point in 3D.

Flatten To 2D On Axis

Creates a 2D flatten copy of the path, by dropping the given axis and using the other two coordinates as the new X, Y coordinates.

Convert Spline To Poly Path

Samples the positions from a USplineComponent into a Poly Path, based on the given Sampling Options.

Convert Poly Path To Array

Populates an array of 3D vectors with the poly path vertex locations.

Convert Array To Poly Path

Creates a poly path from an array of 3D position vectors.

Convert Poly Path To Array Of Vector 2D

Creates an array of 2D Vectors with the poly path vertex locations projected onto the XY plane.

Convert Array Of Vector 2D To Poly Path

Creates a poly path from an array of 2D position vectors. The Z-coordinate of the corresponding Poly Path vertices is zero.

Create Circle Path 3D

Creates a closed circle around the origin on the XY plane, then is repositioned by the Transform input.

Create Circle Path 2D

Creates a closed circle on the XY plane around the given Center.

Create Arc Path 3D

Creates an open arc around the origin on the XY plane, then is repositioned by the Transform input.

Create Arc Path 2D

Creates an open arc on the XY plane around the given Center.

Is Same Mesh As

Returns true if the two input meshes are equivalent under the comparisons defined by the input options.

Measure Distances Between Meshes

Measures the min/max and average closest-point distances between two meshes.

Is Intersecting Mesh

Returns true if the two input meshes (with optional transforms) are geometrically intersecting.

Build BVH For Mesh

Builds a BVH object for a mesh that can be used by Is BVH Valid For Mesh, Rebuild BVH for Mesh, Find Nearest Point On Mesh, Find Nearest Ray Intersection With Mesh, and Is Point Inside Mesh nodes. The function returns a Geometry Script dynamic mesh BVH struct.

Is BVH Valid For Mesh

Checks if the BVH object can still be used with the Mesh — it generally returns false if the mesh has been changed.

Rebuild BVH For Mesh

Rebuilds the BVH object for the mesh in-place, which can reduce memory allocations, compared to building a new BVH.

Find Nearest Point On Mesh

Finds the nearest point on the mesh/BVH to a given 3D point.

Find Nearest Ray Intersection With Mesh

Finds the nearest intersection of a 3D ray with the mesh or BVH.

Is Point Inside Mesh

Tests if a point is inside the mesh/BVH using the Fast Winding Number query.

Create Dynamic Mesh Pool

Creates a new dynamic mesh pool object.

Create Unique New Asset Path Name

Create a new unique asset name given a base path and base asset name, which is useful with functions such as Create New Static Mesh Asset From Mesh.

Get Mesh Info String

Returns a debug string that contains mesh statistics and other information.

Sample Spline To Transforms

Sample a USplineComponent into a list of FTransforms, based on the given Sampling Options.

Overlay

A data structure representing a type of vertex data applied to a mesh.These types include: vertex color, normal, tangent, and UV.

Multiple values of the specified type can be stored at a single vertex. In such cases, depending on the type, one of the following occurs: the last value is used, the values are averaged, or an arbitrary value is used.

One-ring

The neighboring vertices of the selected vertex, connected by an edge.

The one-ring of vertex M.

UV Set

Contains the UV coordinates of a mesh, also referred to as the UV Channel. You can use multiple UV Channels to represent different UV maps.

Extents

The half-dimensions of a box, measured along the three axes. They are used to determine how much to extend from a center point.

A center point, C, and Extent, E, results in a box with a bottom-left-near corner at C - E and a top-right-far corner at C + E.