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#rb Jimmy.Andrews #preflight 621526880f71e491cccb88a4 [CL 19393298 by nathan mitchell in ue5-main branch]
66 lines
1.9 KiB
C++
66 lines
1.9 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#pragma once
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#include "DynamicMesh/DynamicMesh3.h"
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#include "DynamicMesh/DynamicMeshAttributeSet.h"
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namespace UE
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{
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namespace Geometry
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{
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struct FUVOverlayView;
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class FMeshConnectedComponents;
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/**
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* FDynamicMeshUVPacker implements various strategies for packing UV islands in a
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* UV Overlay. The island topology and UV unwraps must already be created, this
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* class simply scales/rotates/translates the islands to fit.
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*/
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class DYNAMICMESH_API FDynamicMeshUVPacker
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{
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public:
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/** The UV Overlay we will be repacking */
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FDynamicMeshUVOverlay* UVOverlay = nullptr;
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/** The explicit triangle ids to repack, repack all triangles if null */
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TUniquePtr<TArray<int32>> TidsToRepack;
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/** Resolution of the target texture. This is used to convert pixel gutter/border thickness to UV space */
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int32 TextureResolution = 512;
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/** Thickness of gutter/border in pixel dimensions. Not supported by all packing methods */
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float GutterSize = 1.0;
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/** If true, islands can be flipped in addition to rotate/translate/scale */
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bool bAllowFlips = false;
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explicit FDynamicMeshUVPacker(FDynamicMeshUVOverlay* UVOverlay);
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explicit FDynamicMeshUVPacker(FDynamicMeshUVOverlay* UVOverlay, TUniquePtr<TArray<int32>>&& TidsToRepackIn);
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/**
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* Standard UnrealEngine UV layout, similar to that used for Lightmap UVs.
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* All UV islands are packed into standard positive-unit-square.
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* Only supports single-pixel border size.
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*/
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bool StandardPack();
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/**
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* Uniformly scale all UV islands so that the largest fits in positive-unit-square,
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* and translate each islands separately so that it's bbox-min is at the origin.
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* So the islands are "stacked" and all fit in the unit box.
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*/
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bool StackPack();
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protected:
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FMeshConnectedComponents CollectUVIslandsToPack(const FUVOverlayView& MeshView);
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};
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} // end namespace UE::Geometry
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} // end namespace UE
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