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  3. TRemoveOccludedTriangles

TRemoveOccludedTriangles

Remove "occluded" triangles, i.e. triangles on the "inside" of the mesh(es).

API > API/Plugins > API/Plugins/DynamicMesh

Remove "occluded" triangles, i.e. triangles on the "inside" of the mesh(es). This is a fuzzy definition, current implementation has a couple of options including a winding number-based version and an ambient-occlusion-ish version, where if face is occluded for all test rays, then we classify it as inside and remove it.

Note this class always removes triangles from an FDynamicMesh3, but can use any mesh type to define the occluding geometry (as long as the mesh type implements the TTriangleMeshAdapter fns)

   
Name TRemoveOccludedTriangles
Type class
Header File /Engine/Plugins/Runtime/GeometryProcessing/Source/DynamicMesh/Public/Operations/RemoveOccludedTriangles.h
Include Path #include "Operations/RemoveOccludedTriangles.h"

Syntax

template<typename OccluderTriangleMeshType>  
class TRemoveOccludedTriangles

Constructors

Name Remarks Include Path Unreal Specifiers

TRemoveOccludedTriangles ( FDynamicMesh3* Mesh
)

   Operations/RemoveOccludedTriangles.h  

Destructors

Name Remarks Include Path Unreal Specifiers

virtual ~TRemoveOccludedTriangles()

   Operations/RemoveOccludedTriangles.h  

Variables

Public

Name Type Remarks Include Path Unreal Specifiers
AddRandomRays int Number of additional ray directions to add to raycast-based occlusion checks, beyond the default +/- major axis directions Operations/RemoveOccludedTriangles.h  
AddTriangleSamples int Number of additional samples to add per triangle Operations/RemoveOccludedTriangles.h  
bRemoveFailed bool True if it wanted to remove triangles but the actual remove operation failed Operations/RemoveOccludedTriangles.h  
InsideMode EOcclusionCalculationMode   Operations/RemoveOccludedTriangles.h  
Mesh FDynamicMesh3 *   Operations/RemoveOccludedTriangles.h  
NormalOffset double We nudge points out by this amount to try to counteract numerical issues Operations/RemoveOccludedTriangles.h  
Progress FProgressCancel * Set this to be able to cancel running operation Operations/RemoveOccludedTriangles.h  
RemovedT TArray< int > Outputs indices of removed triangles. will be empty if nothing removed Operations/RemoveOccludedTriangles.h  
TriangleSamplingMethod EOcclusionTriangleSampling Input settings Operations/RemoveOccludedTriangles.h  
WindingIsoValue double Use this as winding isovalue for WindingNumber mode Operations/RemoveOccludedTriangles.h  

Functions

Public

Name Remarks Include Path Unreal Specifiers

virtual bool Apply ( const FTransformSRT3d& MeshLocalToOccluderSpace,
TMeshAABBTree3< OccluderTriangleMeshType >* Occluder
)

 Remove the occluded triangles single instance case w/out precomputed winding tree Operations/RemoveOccludedTriangles.h  

virtual bool Apply ( const TArrayView< const FTransformSRT3d > MeshLocalToOccluderSpaces,
TMeshAABBTree3< OccluderTriangleMeshType >* Spatial,
TFastWindingTree< OccluderTriangleMeshType >* FastWindingTree
)

 Remove the occluded triangles, considering the given occluder AABB tree (which may represent more geometry than a single mesh) See simpler invocations below for the single instance case or the case where you'd like the spatial data structures built for you Operations/RemoveOccludedTriangles.h  

virtual bool Apply ( const FTransformSRT3d& MeshLocalToOccluderSpace,
TMeshAABBTree3< OccluderTriangleMeshType >* Spatial,
TFastWindingTree< OccluderTriangleMeshType >* FastWindingTree
)

 Remove the occluded triangles single instance case Operations/RemoveOccludedTriangles.h  

virtual bool Apply ( const TArrayView< const FTransformSRT3d > MeshLocalToOccluderSpaces,
const TArrayView< TMeshAABBTree3< OccluderTriangleMeshType >* > Spatials,
const TArrayView< TFastWindingTree< OccluderTriangleMeshType >* > FastWindingTrees,
const TArrayView< const FTransformSRT3d > SpatialTransforms,
bool bTestOccludedByAny
)

 Remove the occluded triangles, considering the given occluder AABB trees (which may represent more geometry than a single mesh) See simpler invocations below for the single instance case or the case where you'd like the spatial data structures built for you Operations/RemoveOccludedTriangles.h  

virtual bool RemoveSelected()

 Remove triangles that were selected (the triangle IDs in the RemoveT array) Operations/RemoveOccludedTriangles.h  

virtual bool Select ( const FTransformSRT3d& MeshLocalToOccluderSpace,
TMeshAABBTree3< OccluderTriangleMeshType >* Occluder
)

 Select the occluded triangles single instance case w/out precomputed winding tree Operations/RemoveOccludedTriangles.h  

virtual bool Select ( const TArrayView< const FTransformSRT3d > MeshLocalToOccluderSpaces,
TMeshAABBTree3< OccluderTriangleMeshType >* Spatial,
TFastWindingTree< OccluderTriangleMeshType >* FastWindingTree
)

 Select the occluded triangles, considering the given occluder AABB tree (which may represent more geometry than a single mesh) See simpler invocations below for the single instance case or the case where you'd like the spatial data structures built for you Operations/RemoveOccludedTriangles.h  

virtual bool Select ( const FTransformSRT3d& MeshLocalToOccluderSpace,
TMeshAABBTree3< OccluderTriangleMeshType >* Spatial,
TFastWindingTree< OccluderTriangleMeshType >* FastWindingTree
)

 Select the occluded triangles single instance case Operations/RemoveOccludedTriangles.h  

virtual bool Select ( const TArrayView< const FTransformSRT3d > MeshLocalToOccluderSpaces,
const TArrayView< TMeshAABBTree3< OccluderTriangleMeshType >* > Spatials,
const TArrayView< TFastWindingTree< OccluderTriangleMeshType >* > FastWindingTrees,
const TArrayView< const FTransformSRT3d > SpatialTransforms,
bool bTestOccludedByAny
)

 Select the occluded triangles, considering the given occluder AABB trees (which may represent more geometry than a single mesh) See simpler invocations below for the single instance case or the case where you'd like the spatial data structures built for you Selection will be stored in the RemovedT array, but no triangles will be removed. Operations/RemoveOccludedTriangles.h  

virtual EOperationValidationResult Validate()

   Operations/RemoveOccludedTriangles.h  

Protected

Name Remarks Include Path Unreal Specifiers

virtual bool Cancelled()

 If this returns true, abort computation. Operations/RemoveOccludedTriangles.h  

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