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  3. FPatchBasedMeshUVGenerator

FPatchBasedMeshUVGenerator

[FPatchBasedMeshUVGenerator](API\Plugins\DynamicMesh\Parameterization\FPatchBasedMeshUVGenerator) is an automatic UV generator for a triangle mesh that, generally, works by first decomposing the mesh into small patches for which a "known good" parameterization can be computed, and then incrementally merging those patches into larger ones to create final UV islands.

API > API/Plugins > API/Plugins/DynamicMesh > API/Plugins/DynamicMesh/Parameterization

References

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

Syntax

class FPatchBasedMeshUVGenerator

Remarks

FPatchBasedMeshUVGenerator is an automatic UV generator for a triangle mesh that, generally, works by first decomposing the mesh into small patches for which a "known good" parameterization can be computed, and then incrementally merging those patches into larger ones to create final UV islands.

The various steps of the generator can be called independently, eg if one already has a patch decomposition, then the initial steps can be skipped

Variables

  Type Name Description
Public variable bool bAutoAlignPatches Packing parameters (used in AutoComputeUVs)
Public variable bool bAutoPack  
Public variable bool bNormalWeightedPatches  
Public variable double CompactnessThreshold  
Public variable FPolygroupSet * GroupConstraint If this is set, then the output patches will respect the borders of the input polygroups, eg as if they were disconnected components.
Public variable double MaxNormalDeviationDeg  
Public variable double MergingThreshold Parameters for island merging (ComputeIslandsByRegionMerging)
Public variable int32 MinPatchSize  
Public variable double NormalSmoothingAlpha  
Public variable int32 NormalSmoothingRounds ExpMap parameters (ComputeUVsFromTriangleSets)
Public variable float PackingGutterWidth  
Public variable int32 PackingTextureResolution  
Public variable double PatchNormalWeight  
Public variable int32 TargetPatchCount Parameters for patch generation (ComputeInitialMeshPatches)

Functions

  Type Name Description
Public function FGeometryResult

AutoComputeUVs ( FDynamicMesh3& TargetMesh,
FDynamicMeshUVOverlay& TargetUVOverlay,
FProgressCancel* Progress
)

 Top-level driver function, automatically computes UVs on the given TargetMesh and stores in the given TargetUVOverlay, using the steps below, based on the parameters above
Public function bool

ComputeInitialMeshPatches ( FDynamicMesh3& TargetMesh,
FMeshConnectedComponents& InitialComponentsOut,
FProgressCancel* Progress
)

 Compute a decomposition of TargetMesh into many small patches (driven by TargetPatchCount).
Public function bool

ComputeIslandsByRegionMerging ( FDynamicMesh3& TargetMesh,
FDynamicMeshUVOverlay& TargetUVOverlay,
const FMeshConnectedComponents& InitialComponents,
TArray< TArray< int32 >>& IslandsOut,
FProgressCancel* Progress
)

 Incrementally combine existing mesh patches into larger patches that meet the various criteria defined by the parameters above
Public function int32

ComputeUVsFromTriangleSets ( FDynamicMesh3& TargetMesh,
FDynamicMeshUVOverlay& TargetUVOverlay,
const TArray< TArray< int32 >>& TriangleSets,
TArray< bool >& bValidUVsComputedOut,
FProgressCancel* Progress
)

 Calculate UVs for the input mesh patches of TargetMesh and store in TargetUVOVerlay

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