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  3. FMeshSelfUnion

FMeshSelfUnion

MeshSelfUnion perform a "Mesh Boolean" style union of a mesh on itself, resolving any self intersections and welding the new boundaries as needed

API > API/Runtime > API/Runtime/GeometryCore > API/Runtime/GeometryCore/Operations

References

   
Module GeometryCore
Header /Engine/Source/Runtime/GeometryCore/Public/Operations/MeshSelfUnion.h
Include #include "Operations/MeshSelfUnion.h"

Syntax

class FMeshSelfUnion

Remarks

MeshSelfUnion perform a "Mesh Boolean" style union of a mesh on itself, resolving any self intersections and welding the new boundaries as needed

Variables

  Type Name Description
Public variable TSet< int32 > AllNewEdges All edges created by mesh boolean algorithm. Only populated if bTrackAllNewEdges = true
Public variable bool bCollapseDegenerateEdgesOnCut Inputs Whether to do additional processing to try to remove degenerate edges
Public variable bool bPreserveOverlayUVs Prevent simplification from distorting overlay UVs
Public variable bool bPreserveTriangleGroups Prevent simplification from distorting triangle groups
Public variable bool bPreserveVertexNormals Prevent simplification from distorting vertex normals
Public variable bool bPreserveVertexUVs Prevent simplification from distorting vertex UVs
Public variable bool bSimplifyAlongNewEdges Control whether we attempt to auto-simplify the small planar triangles that the boolean operation tends to generate
Public variable bool bTrackAllNewEdges Control whether new edges should be tracked
Public variable bool bTrimFlaps Whether to remove visible "open" geometry
Public variable bool bWeldSharedEdges Weld newly-created cut edges where the mesh is unioned with itself.
Public variable TArray< int > CreatedBoundaryEdges Output Boundary edges created by the mesh boolean algorithm failing to cleanly weld (doesn't include boundaries that already existed in source mesh)
Public variable double DegenerateEdgeTolFactor Tolerance factor (multiplied by SnapTolerance) for removing short edges created by the cutting process; should be no more than 2
Public variable FDynamicMesh3 * Mesh The input mesh, to be modified.
Public variable float NormalDistortTolerance When preserving normals, sets maximum allowed change in normals from collapsing an edge, measured at the removed vertex in degrees
Public variable double NormalOffset Amount we nudge samples off the surface when evaluating winding number, to avoid numerical issues
Public variable FProgressCancel * Progress Set this to be able to cancel running operation
Public variable double SimplificationAngleTolerance Simplification-specific settings (only relevant if bSimplifyAlongNewEdges==true): Degrees of deviation from coplanar that we will still simplify
Public variable double SnapTolerance Tolerance distance for considering a point to be on a vertex or edge, especially during mesh-mesh cutting
Public variable double TryToImproveTriQualityThreshold If triangle quality (aspect ratio) is worse than this threshold, only simplify in ways that improve quality.
Public variable float UVDistortTolerance When preserving UVs, sets maximum allowed change in UV coordinates from collapsing an edge, measured at the removed vertex
Public variable double WindingThreshold Threshold to determine whether triangle in one mesh is inside or outside of the other

Constructors

  Type Name Description
Public function    

Destructors

  Type Name Description
Public function Virtual    

Functions

  Type Name Description
Protected function Virtual bool If this returns true, abort computation.
Public function bool

Compute ()

 Compute the plane cut by splitting mesh edges that cross the cut plane, and then deleting any triangles on the positive side of the cutting plane.
Public function EOperationValidationResult  

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