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#rb none #rnx #jira none #preflight 60a7e75e7d6b060001c61f47 [CL 16428413 by Ryan Schmidt in ue5-main branch]
104 lines
3.3 KiB
C++
104 lines
3.3 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#include "IndexedMeshToDynamicMesh.h"
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#include "DynamicMesh/DynamicMeshAttributeSet.h"
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#include "DynamicMesh/DynamicMeshOverlay.h"
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#include "DynamicMesh/MeshNormals.h"
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#include "DynamicMesh/Operations/MergeCoincidentMeshEdges.h"
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using namespace UE::Geometry;
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void UE::Conversion::RenderBuffersToDynamicMesh(
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const FStaticMeshVertexBuffers& VertexData,
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const FRawStaticIndexBuffer& IndexData,
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const FStaticMeshSectionArray& SectionData,
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FDynamicMesh3& MeshOut,
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bool bAttemptToWeldSeams)
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{
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const FStaticMeshVertexBuffer& VertexBuffer = VertexData.StaticMeshVertexBuffer;
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const FPositionVertexBuffer& PositionBuffer = VertexData.PositionVertexBuffer;
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const FColorVertexBuffer& ColorBuffer = VertexData.ColorVertexBuffer;
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int32 NumUVChannels = VertexBuffer.GetNumTexCoords();
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bool bHasUVs = (NumUVChannels > 0);
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NumUVChannels = FMath::Max(1, NumUVChannels);
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MeshOut.Clear();
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MeshOut.EnableAttributes();
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FDynamicMeshNormalOverlay* Normals = MeshOut.Attributes()->PrimaryNormals();
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MeshOut.Attributes()->EnableTangents();
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FDynamicMeshNormalOverlay* Tangents = MeshOut.Attributes()->PrimaryTangents();
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FDynamicMeshNormalOverlay* BiTangents = MeshOut.Attributes()->PrimaryBiTangents();
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MeshOut.Attributes()->SetNumUVLayers(NumUVChannels);
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TArray<FDynamicMeshUVOverlay*> UVs;
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for (int32 ui = 0; ui < NumUVChannels; ++ui)
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{
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UVs.Add(MeshOut.Attributes()->GetUVLayer(ui));
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}
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MeshOut.Attributes()->EnableMaterialID();
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FDynamicMeshMaterialAttribute* MaterialID = MeshOut.Attributes()->GetMaterialID();
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int32 NumVertices = PositionBuffer.GetNumVertices();
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for (int32 vi = 0; vi < NumVertices; ++vi)
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{
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FVector3f Position = PositionBuffer.VertexPosition(vi);
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int32 vid = MeshOut.AppendVertex(FVector3d(Position));
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ensure(vid == vi);
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FVector4 Normal = VertexBuffer.VertexTangentZ(vi);
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int32 nid = Normals->AppendElement(&Normal.X);
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ensure(nid == vi);
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FVector3f Tangent = VertexBuffer.VertexTangentX(vi);
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int32 tid = Tangents->AppendElement(&Tangent.X);
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ensure(tid == vi);
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FVector3f BiTangent = VertexBuffer.VertexTangentY(vi);
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int32 bid = BiTangents->AppendElement(&BiTangent.X);
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ensure(bid == vi);
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for (int32 ui = 0; ui < NumUVChannels; ++ui)
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{
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FVector2D UV = (bHasUVs) ? VertexBuffer.GetVertexUV(vi, ui) : FVector2D::ZeroVector;
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int32 uvid = UVs[ui]->AppendElement((FVector2f)UV);
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ensure(uvid == vi);
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}
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}
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int32 NumTriangles = IndexData.GetNumIndices() / 3;
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for (int32 ti = 0; ti < NumTriangles; ++ti)
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{
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int32 a = IndexData.GetIndex(3 * ti);
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int32 b = IndexData.GetIndex(3 * ti + 1);
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int32 c = IndexData.GetIndex(3 * ti + 2);
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int32 tid = MeshOut.AppendTriangle(a, b, c);
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ensure(tid == ti);
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Normals->SetTriangle(tid, FIndex3i(a, b, c));
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Tangents->SetTriangle(tid, FIndex3i(a, b, c));
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BiTangents->SetTriangle(tid, FIndex3i(a, b, c));
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for (int32 ui = 0; ui < NumUVChannels; ++ui)
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{
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UVs[ui]->SetTriangle(tid, FIndex3i(a, b, c));
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}
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}
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for (const FStaticMeshSection& Section : SectionData)
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{
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int32 MatIndex = Section.MaterialIndex;
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for (uint32 k = 0; k < Section.NumTriangles; ++k)
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{
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uint32 TriIdx = (Section.FirstIndex/3) + k;
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MaterialID->SetValue((int32)TriIdx, MatIndex);
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}
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}
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if (bAttemptToWeldSeams)
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{
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FMergeCoincidentMeshEdges Merge(&MeshOut);
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Merge.Apply();
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}
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} |