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  3. FMeshDescriptionBuilder

FMeshDescriptionBuilder

Utility class to construct MeshDescription instances.

API > API/Runtime > API/Runtime/MeshConversion

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

   
Name FMeshDescriptionBuilder
Type class
Header File /Engine/Source/Runtime/MeshConversion/Public/MeshDescriptionBuilder.h
Include Path #include "MeshDescriptionBuilder.h"

Syntax

class FMeshDescriptionBuilder

Functions

Public

Name Remarks Include Path Unreal Specifiers

FVertexInstanceID AppendInstance ( const FVertexID& VertexID
)

 Append new vertex instance and return ID MeshDescriptionBuilder.h  

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. MeshDescriptionBuilder.h  
Create a new MeshDescription PolygonGroup and return it's ID. MeshDescriptionBuilder.h  

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 MeshDescriptionBuilder.h  

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 MeshDescriptionBuilder.h  

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

 Append a triangle to the mesh with the given PolygonGroup ID MeshDescriptionBuilder.h  

FUVID AppendUV ( const FVector2D& UVvalue,
int32 UVLayerIndex
)

 Append a UV 'vertex' and return a new UV ID MeshDescriptionBuilder.h  

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. MeshDescriptionBuilder.h  

FVertexID AppendVertex ( const FVector& Position
)

 Append vertex and return new vertex ID MeshDescriptionBuilder.h  

FVertexID AppendVertexWithId ( int32 NewVertexID,
const FVector& Position
)

 Append vertex with a specific ID and return it MeshDescriptionBuilder.h  

FBox ComputeBoundingBox()

 Return the current bounding box of the mesh MeshDescriptionBuilder.h  

void EnablePolyGroups()

 Enable per-triangle integer attribute named PolyTriGroups MeshDescriptionBuilder.h  

FVector GetPosition ( const FVertexID& VertexID
)

 Return position of vertex MeshDescriptionBuilder.h  

FVector GetPosition ( const FVertexInstanceID& InstanceID
)

 Return position of vertex parent of instance MeshDescriptionBuilder.h  

void ReserveNewUVs ( int32 Count,
int UVLayerIndex
)

 Pre-allocate space in the mesh description for UVs in the indicated UVLayer MeshDescriptionBuilder.h  

void ReserveNewVertices ( int32 Count
)

 Pre-allocate space in the mesh description MeshDescriptionBuilder.h  

void ResumeMeshDescriptionIndexing()

 Enable the construction of secondary data structures in the mesh description MeshDescriptionBuilder.h  

void SetAllEdgesHardness ( bool bHard
)

 Set MeshAttribute::Edge::IsHard to true for all edges MeshDescriptionBuilder.h  

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

 Set the Color of a vertex instance MeshDescriptionBuilder.h  

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

 Set the Normal of a vertex instance MeshDescriptionBuilder.h  

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 MeshDescriptionBuilder.h  

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

 Set the UV of a vertex instance. MeshDescriptionBuilder.h  

void SetMeshDescription ( FMeshDescription* Description
)

   MeshDescriptionBuilder.h  

void SetNumUVLayers ( int32 NumUVLayers
)

 Set the number of UV layers MeshDescriptionBuilder.h  

void SetPolyGroupID ( const FTriangleID& TriangleID,
int GroupID
)

 Set the PolyTriGroups attribute value to a specific GroupID for a Triangle MeshDescriptionBuilder.h  

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

 Set the position of a vertex MeshDescriptionBuilder.h  

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

 Set the specified value for the named attribute / vertex index combination. MeshDescriptionBuilder.h  

void SuspendMeshDescriptionIndexing()

 Disable the construction of secondary data structures in the mesh description MeshDescriptionBuilder.h  

void Translate ( const FVector& Translation
)

 Translate the MeshDescription vertex positions MeshDescriptionBuilder.h  

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