1. Epic GamesDeveloper
  3. FMeshDescriptionBuilder

FMeshDescriptionBuilder

Utility class to construct MeshDescription instances.

API > API/Runtime > API/Runtime/MeshConversion

References

   
Module MeshConversion
Header /Engine/Source/Runtime/MeshConversion/Public/MeshDescriptionBuilder.h
Include #include "MeshDescriptionBuilder.h"

Syntax

class FMeshDescriptionBuilder

Remarks

Utility class to construct MeshDescription instances. NB: this will add a vertex-instance UV to the Description, if it has none.

Variables

  Type Name Description
Protected variable TPolygonGroupAttributesRef< FName > GroupMaterialSlotNames  
Protected variable TVertexInstanceAttributesRef< float > InstanceBiTangentSign  
Protected variable TVertexInstanceAttributesRef< FVector4f > InstanceColors  
Protected variable TVertexInstanceAttributesRef< FVector3f > InstanceNormals  
Protected variable TVertexInstanceAttributesRef< FVector3f > InstanceTangents  
Protected variable TVertexInstanceAttributesRef< FVector2f > InstanceUVs  
Protected variable FMeshDescription * MeshDescription  
Protected variable TPolygonAttributesRef< int > PolyGroups  
Protected variable TArray< FVertexID > TempBuffer  
Protected variable TArray< FUVID > TempUVBuffer  
Protected variable TArray< TUVAttributesRef< FVector2f > > UVCoordinateLayers  
Protected variable TVertexAttributesRef< FVector3f > VertexPositions  

Functions

  Type Name Description
Public function FVertexInstanceID

AppendInstance ( const FVertexID& VertexID
)

 Append new vertex instance and return ID
Public function FPolygonID

AppendPolygon ( const TArray< FVertexID >& Vertices,
const FPolygonGroupID& PolygonGroup
)

 Append an arbitrary polygon to the mesh with the given PolygonGroup ID Unique Vertex instances will be created for each polygon-vertex.
Public function FPolygonGroupID

AppendPolygonGroup ( FName MaterialSlotName
)

 Create a new MeshDescription PolygonGroup and return it's ID.
Public function FTriangleID

AppendTriangle ( const FVertexInstanceID& Instance0,
const FVertexInstanceID& Instance1,
const FVertexInstanceID& Instance2,
const FPolygonGroupID& PolygonGroup
)

 Append a triangle to the mesh using the given vertex instances and PolygonGroup ID
Public function FTriangleID

AppendTriangle ( const FVertexID& Vertex0,
const FVertexID& Vertex1,
const FVertexID& Vertex2,
const FPolygonGroupID& PolygonGroup
)

 Append a triangle to the mesh with the given PolygonGroup ID
Public function FTriangleID

AppendTriangle ( const FVertexID* Triangle,
const FPolygonGroupID& PolygonGroup
)

 Append a triangle to the mesh with the given PolygonGroup ID
Public function FUVID

AppendUV ( const FVector2D& UVvalue,
int32 UVLayerIndex
)

 Append a UV 'vertex' and return a new UV ID
Public function void

AppendUVTriangle ( const FTriangleID& TriangleID,
const FUVID UVverterxID0,
const FUVID UVvertexID1,
const FUVID UVvertexID2,
int32 UVLayerIndex
)

 Append a UV triangle to the specified UV layer.
Public function FVertexID

AppendVertex ( const FVector& Position
)

 Append vertex and return new vertex ID
Public function Const FBox Return the current bounding box of the mesh
Public function void Enable per-triangle integer attribute named PolyTriGroups
Public function FVector

GetPosition ( const FVertexID& VertexID
)

 Return position of vertex
Public function FVector

GetPosition ( const FVertexInstanceID& InstanceID
)

 Return position of vertex parent of instance
Public function void

ReserveNewUVs ( int32 Count,
int UVLayerIndex
)

 Pre-allocate space in the mesh description for UVs in the indicated UVLayer
Public function void Pre-allocate space in the mesh description
Public function void Enable the construction of secondary data structures in the mesh description
Public function void

SetAllEdgesHardness ( bool bHard
)

 Set MeshAttribute::Edge::IsHard to true for all edges
Public function void

SetInstanceColor ( const FVertexInstanceID& InstanceID,
const FVector4f& Color
)

 Set the Color of a vertex instance
Public function void

SetInstanceNormal ( const FVertexInstanceID& InstanceID,
const FVector& Normal
)

 Set the Normal of a vertex instance
Public function void

SetInstanceTangentSpace ( const FVertexInstanceID& InstanceID,
const FVector& Normal,
const FVector& Tangent,
float Sign
)

 Set the full tangent space of a vertex instance, this is stored as a vec3 normal, vec3 tangent, and a bitangent sign
Public function void

SetInstanceUV ( const FVertexInstanceID& InstanceID,
const FVector2D& InstanceUV,
int32 UVLayerIndex
)

 Set the UV of a vertex instance.
Public function void  
Public function void

SetNumUVLayers ( int32 NumUVLayers
)

 Set the number of UV layers
Public function void

SetPolyGroupID ( const FTriangleID& TriangleID,
int GroupID
)

 Set the PolyTriGroups attribute value to a specific GroupID for a Triangle
Public function void

SetPosition ( const FVertexID& VertexID,
const FVector& NewPosition
)

 Set the position of a vertex
Public function void

SetVertexAttributeValue ( FName AttributeName,
FVertexID VertexID,
const T& Value
)

 Set the specified value for the named attribute / vertex index combination.
Public function void Disable the construction of secondary data structures in the mesh description
Public function void

Translate ( const FVector& Translation
)

 Translate the MeshDescription vertex positions

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