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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 > API/Plugins/DynamicMesh/Operations

References

   
Module DynamicMesh
Header /Engine/Plugins/Runtime/GeometryProcessing/Source/DynamicMesh/Public/Operations/RemoveOccludedTriangles.h
Include #include "Operations/RemoveOccludedTriangles.h"

Syntax

template<typename OccluderTriangleMeshType>  
class TRemoveOccludedTriangles

Remarks

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)

Variables

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

Constructors

  Type Name Description
Public function    

Destructors

  Type Name Description
Public function Virtual    

Functions

  Type Name Description
Public function Virtual bool

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

 Remove the occluded triangles single instance case w/out precomputed winding tree
Public function 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
Public function Virtual bool

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

 Remove the occluded triangles single instance case
Public function 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
Protected function Virtual bool If this returns true, abort computation.
Public function Virtual bool Remove triangles that were selected (the triangle IDs in the RemoveT array)
Public function Virtual bool

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

 Select the occluded triangles single instance case w/out precomputed winding tree
Public function 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
Public function Virtual bool

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

 Select the occluded triangles single instance case
Public function 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.
Public function Virtual EOperationValidationResult  

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