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1134 lines
32 KiB
C++
1134 lines
32 KiB
C++
// Copyright 1998-2019 Epic Games, Inc. All Rights Reserved.
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#include "DynamicMeshEditor.h"
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#include "DynamicMeshAttributeSet.h"
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#include "Util/BufferUtil.h"
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#include "MeshRegionBoundaryLoops.h"
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void FMeshIndexMappings::Initialize(FDynamicMesh3* Mesh)
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{
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if (Mesh->HasAttributes())
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{
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FDynamicMeshAttributeSet* Attribs = Mesh->Attributes();
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UVMaps.SetNum(Attribs->NumUVLayers());
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NormalMaps.SetNum(Attribs->NumNormalLayers());
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}
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}
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void FDynamicMeshEditResult::GetAllTriangles(TArray<int>& TrianglesOut) const
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{
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BufferUtil::AppendElements(TrianglesOut, NewTriangles);
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int NumQuads = NewQuads.Num();
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for (int k = 0; k < NumQuads; ++k)
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{
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TrianglesOut.Add(NewQuads[k].A);
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TrianglesOut.Add(NewQuads[k].B);
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}
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int NumPolys = NewPolygons.Num();
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for (int k = 0; k < NumPolys; ++k)
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{
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BufferUtil::AppendElements(TrianglesOut, NewPolygons[k]);
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}
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}
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bool FDynamicMeshEditor::StitchVertexLoopsMinimal(const TArray<int>& Loop1, const TArray<int>& Loop2, FDynamicMeshEditResult& ResultOut)
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{
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int N = Loop1.Num();
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checkf(N == Loop2.Num(), TEXT("FDynamicMeshEditor::StitchLoop: loops are not the same length!"));
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if (N != Loop2.Num())
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{
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return false;
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}
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ResultOut.NewQuads.Reserve(N);
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ResultOut.NewGroups.Reserve(N);
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int i = 0;
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for (; i < N; ++i)
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{
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int a = Loop1[i];
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int b = Loop1[(i + 1) % N];
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int c = Loop2[i];
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int d = Loop2[(i + 1) % N];
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int NewGroupID = Mesh->AllocateTriangleGroup();
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ResultOut.NewGroups.Add(NewGroupID);
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FIndex3i t1(b, a, d);
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int tid1 = Mesh->AppendTriangle(t1, NewGroupID);
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FIndex3i t2(a, c, d);
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int tid2 = Mesh->AppendTriangle(t2, NewGroupID);
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ResultOut.NewQuads.Add(FIndex2i(tid1, tid2));
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if (tid1 < 0 || tid2 < 0)
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{
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goto operation_failed;
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}
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}
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return true;
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operation_failed:
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// remove what we added so far
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if (ResultOut.NewQuads.Num())
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{
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TArray<int> Triangles; Triangles.Reserve(2*ResultOut.NewQuads.Num());
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for (const FIndex2i& QuadTriIndices : ResultOut.NewQuads)
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{
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Triangles.Add(QuadTriIndices.A);
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Triangles.Add(QuadTriIndices.B);
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}
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if (!RemoveTriangles(Triangles, false))
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{
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checkf(false, TEXT("FDynamicMeshEditor::StitchLoop: failed to add all triangles, and also failed to back out changes."));
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}
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}
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return false;
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}
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bool FDynamicMeshEditor::StitchSparselyCorrespondedVertexLoops(const TArray<int>& VertexIDs1, const TArray<int>& MatchedIndices1, const TArray<int>& VertexIDs2, const TArray<int>& MatchedIndices2, FDynamicMeshEditResult& ResultOut)
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{
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int CorrespondN = MatchedIndices1.Num();
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if (!ensureMsgf(CorrespondN == MatchedIndices2.Num(), TEXT("FDynamicMeshEditor::StitchSparselyCorrespondedVertices: correspondence arrays are not the same length!")))
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{
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return false;
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}
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// TODO: support case of only one corresponded vertex & a connecting a full loop around?
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// this requires allowing start==end to not immediately stop the walk ...
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if (!ensureMsgf(CorrespondN >= 2, TEXT("Must have at least two corresponded vertices")))
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{
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return false;
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}
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ResultOut.NewGroups.Reserve(CorrespondN);
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int i = 0;
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for (; i < CorrespondN; ++i)
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{
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int Starts[2] { MatchedIndices1[i], MatchedIndices2[i] };
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int Ends[2] { MatchedIndices1[(i + 1) % CorrespondN], MatchedIndices2[(i + 1) % CorrespondN] };
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auto GetWrappedSpanLen = [](const FDynamicMesh3* M, const TArray<int>& VertexIDs, int StartInd, int EndInd)
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{
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float LenTotal = 0;
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FVector3d V = M->GetVertex(VertexIDs[StartInd]);
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for (int Ind = StartInd, IndNext; Ind != EndInd;)
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{
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IndNext = (Ind + 1) % VertexIDs.Num();
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FVector3d VNext = M->GetVertex(VertexIDs[IndNext]);
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LenTotal += V.Distance(VNext);
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Ind = IndNext;
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V = VNext;
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}
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return LenTotal;
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};
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float LenTotal[2] { GetWrappedSpanLen(Mesh, VertexIDs1, Starts[0], Ends[0]), GetWrappedSpanLen(Mesh, VertexIDs2, Starts[1], Ends[1]) };
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float LenAlong[2] { FMathf::Epsilon, FMathf::Epsilon };
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LenTotal[0] += FMathf::Epsilon;
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LenTotal[1] += FMathf::Epsilon;
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int NewGroupID = Mesh->AllocateTriangleGroup();
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ResultOut.NewGroups.Add(NewGroupID);
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int Walks[2]{ Starts[0], Starts[1] };
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FVector3d Vertex[2]{ Mesh->GetVertex(VertexIDs1[Starts[0]]), Mesh->GetVertex(VertexIDs2[Starts[1]]) };
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while (Walks[0] != Ends[0] || Walks[1] != Ends[1])
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{
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float PctAlong[2]{ LenAlong[0] / LenTotal[0], LenAlong[1] / LenTotal[1] };
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bool bAdvanceSecond = (Walks[0] == Ends[0] || (Walks[1] != Ends[1] && PctAlong[0] > PctAlong[1]));
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FIndex3i Tri(VertexIDs1[Walks[0]], VertexIDs2[Walks[1]], -1);
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if (!bAdvanceSecond)
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{
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Walks[0] = (Walks[0] + 1) % VertexIDs1.Num();
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Tri.C = VertexIDs1[Walks[0]];
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FVector3d NextV = Mesh->GetVertex(Tri.C);
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LenAlong[0] += NextV.Distance(Vertex[0]);
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Vertex[0] = NextV;
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}
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else
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{
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Walks[1] = (Walks[1] + 1) % VertexIDs2.Num();
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Tri.C = VertexIDs2[Walks[1]];
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FVector3d NextV = Mesh->GetVertex(Tri.C);
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LenAlong[1] += NextV.Distance(Vertex[1]);
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Vertex[1] = NextV;
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}
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int Tid = Mesh->AppendTriangle(Tri, NewGroupID);
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ResultOut.NewTriangles.Add(Tid);
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if (Tid < 0)
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{
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goto operation_failed;
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}
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}
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}
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return true;
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operation_failed:
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// remove what we added so far
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if (ResultOut.NewTriangles.Num())
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{
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ensureMsgf(RemoveTriangles(ResultOut.NewTriangles, false), TEXT("FDynamicMeshEditor::StitchSparselyCorrespondedVertexLoops: failed to add all triangles, and also failed to back out changes."));
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}
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return false;
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}
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bool FDynamicMeshEditor::AddTriangleFan_OrderedVertexLoop(int CenterVertex, const TArray<int>& VertexLoop, int GroupID, FDynamicMeshEditResult& ResultOut)
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{
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if (GroupID == -1)
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{
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GroupID = Mesh->AllocateTriangleGroup();
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ResultOut.NewGroups.Add(GroupID);
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}
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int N = VertexLoop.Num();
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ResultOut.NewTriangles.Reserve(N);
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int i = 0;
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for (i = 0; i < N; ++i)
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{
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int A = VertexLoop[i];
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int B = VertexLoop[(i + 1) % N];
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FIndex3i NewT(CenterVertex, B, A);
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int NewTID = Mesh->AppendTriangle(NewT, GroupID);
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if (NewTID < 0)
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{
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goto operation_failed;
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}
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ResultOut.NewTriangles.Add(NewTID);
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}
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return true;
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operation_failed:
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// remove what we added so far
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if (!RemoveTriangles(ResultOut.NewTriangles, false))
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{
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checkf(false, TEXT("FDynamicMeshEditor::AddTriangleFan: failed to add all triangles, and also failed to back out changes."));
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}
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return false;
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}
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bool FDynamicMeshEditor::RemoveTriangles(const TArray<int>& Triangles, bool bRemoveIsolatedVerts)
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{
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return RemoveTriangles(Triangles, bRemoveIsolatedVerts, [](int) {});
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}
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bool FDynamicMeshEditor::RemoveTriangles(const TArray<int>& Triangles, bool bRemoveIsolatedVerts, TFunctionRef<void(int)> OnRemoveTriFunc)
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{
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bool bAllOK = true;
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int NumTriangles = Triangles.Num();
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for (int i = 0; i < NumTriangles; ++i)
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{
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if (Mesh->IsTriangle(Triangles[i]) == false)
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{
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continue;
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}
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OnRemoveTriFunc(Triangles[i]);
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EMeshResult result = Mesh->RemoveTriangle(Triangles[i], bRemoveIsolatedVerts, false);
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if (result != EMeshResult::Ok)
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{
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bAllOK = false;
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}
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}
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return bAllOK;
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}
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/**
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* Make a copy of provided triangles, with new vertices. You provide IndexMaps because
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* you know if you are doing a small subset or a full-mesh-copy.
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*/
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void FDynamicMeshEditor::DuplicateTriangles(const TArray<int>& Triangles, FMeshIndexMappings& IndexMaps, FDynamicMeshEditResult& ResultOut)
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{
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ResultOut.Reset();
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IndexMaps.Initialize(Mesh);
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for (int TriangleID : Triangles)
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{
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FIndex3i Tri = Mesh->GetTriangle(TriangleID);
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int NewGroupID = FindOrCreateDuplicateGroup(TriangleID, IndexMaps, ResultOut);
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FIndex3i NewTri;
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NewTri[0] = FindOrCreateDuplicateVertex(Tri[0], IndexMaps, ResultOut);
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NewTri[1] = FindOrCreateDuplicateVertex(Tri[1], IndexMaps, ResultOut);
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NewTri[2] = FindOrCreateDuplicateVertex(Tri[2], IndexMaps, ResultOut);
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int NewTriangleID = Mesh->AppendTriangle(NewTri, NewGroupID);
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IndexMaps.SetTriangle(TriangleID, NewTriangleID);
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ResultOut.NewTriangles.Add(NewTriangleID);
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CopyAttributes(TriangleID, NewTriangleID, IndexMaps, ResultOut);
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//Mesh->CheckValidity(true);
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}
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}
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bool FDynamicMeshEditor::DisconnectTriangles(const TArray<int>& Triangles, TArray<FLoopPairSet>& LoopSetOut)
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{
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check(Mesh->HasAttributes() == false); // not supported yet
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// find the region boundary loops
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FMeshRegionBoundaryLoops RegionLoops(Mesh, Triangles, false);
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bool bOK = RegionLoops.Compute();
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check(bOK);
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if (!bOK)
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{
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return false;
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}
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TArray<FEdgeLoop>& Loops = RegionLoops.Loops;
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// need to test Contains() many times
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TSet<int> TriangleSet;
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TriangleSet.Reserve(Triangles.Num() * 3);
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for (int TriID : Triangles)
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{
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TriangleSet.Add(TriID);
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}
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// process each loop island
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int NumLoops = Loops.Num();
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LoopSetOut.SetNum(NumLoops);
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for ( int li = 0; li < NumLoops; ++li)
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{
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FEdgeLoop& Loop = Loops[li];
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FLoopPairSet& LoopPair = LoopSetOut[li];
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LoopPair.LoopA = Loop;
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// duplicate the vertices
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int NumVertices = Loop.Vertices.Num();
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TMap<int, int> LoopVertexMap; LoopVertexMap.Reserve(NumVertices);
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TArray<int> NewVertexLoop; NewVertexLoop.SetNum(NumVertices);
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for (int vi = 0; vi < NumVertices; ++vi)
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{
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int VertID = Loop.Vertices[vi];
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int NewVertID = Mesh->AppendVertex(*Mesh, VertID);
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LoopVertexMap.Add(Loop.Vertices[vi], NewVertID);
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NewVertexLoop[vi] = NewVertID;
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}
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// for each border triangle, rewrite vertices
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int NumEdges = Loop.Edges.Num();
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for (int ei = 0; ei < NumEdges; ++ei)
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{
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int EdgeID = Loop.Edges[ei];
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FIndex2i EdgeTris = Mesh->GetEdgeT(EdgeID);
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int EditTID = TriangleSet.Contains(EdgeTris.A) ? EdgeTris.A : EdgeTris.B;
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if (EditTID == FDynamicMesh3::InvalidID)
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{
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continue; // happens on final edge, and on input boundary edges
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}
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FIndex3i OldTri = Mesh->GetTriangle(EditTID);
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FIndex3i NewTri = OldTri;
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int Modified = 0;
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for (int j = 0; j < 3; ++j)
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{
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const int* NewVertID = LoopVertexMap.Find(OldTri[j]);
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if (NewVertID != nullptr)
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{
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NewTri[j] = *NewVertID;
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++Modified;
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}
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}
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if (Modified > 0)
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{
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Mesh->SetTriangle(EditTID, NewTri, false);
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}
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}
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LoopPair.LoopB.InitializeFromVertices(Mesh, NewVertexLoop, false);
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}
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return true;
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}
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FVector3f FDynamicMeshEditor::ComputeAndSetQuadNormal(const FIndex2i& QuadTris, bool bIsPlanar)
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{
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FVector3f Normal(0, 0, 1);
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if (bIsPlanar)
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{
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Normal = (FVector3f)Mesh->GetTriNormal(QuadTris.A);
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}
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else
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{
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Normal = (FVector3f)Mesh->GetTriNormal(QuadTris.A);
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Normal += (FVector3f)Mesh->GetTriNormal(QuadTris.B);
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Normal.Normalize();
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}
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SetQuadNormals(QuadTris, Normal);
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return Normal;
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}
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void FDynamicMeshEditor::SetQuadNormals(const FIndex2i& QuadTris, const FVector3f& Normal)
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{
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check(Mesh->HasAttributes());
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FDynamicMeshNormalOverlay* Normals = Mesh->Attributes()->PrimaryNormals();
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FIndex3i Triangle1 = Mesh->GetTriangle(QuadTris.A);
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FIndex3i NormalTriangle1;
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NormalTriangle1[0] = Normals->AppendElement(Normal, Triangle1[0]);
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NormalTriangle1[1] = Normals->AppendElement(Normal, Triangle1[1]);
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NormalTriangle1[2] = Normals->AppendElement(Normal, Triangle1[2]);
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Normals->SetTriangle(QuadTris.A, NormalTriangle1);
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if (Mesh->IsTriangle(QuadTris.B))
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{
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FIndex3i Triangle2 = Mesh->GetTriangle(QuadTris.B);
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FIndex3i NormalTriangle2;
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for (int j = 0; j < 3; ++j)
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{
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int i = Triangle1.IndexOf(Triangle2[j]);
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if (i == -1)
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{
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NormalTriangle2[j] = Normals->AppendElement(Normal, Triangle2[j]);
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}
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else
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{
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NormalTriangle2[j] = NormalTriangle1[i];
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}
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}
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Normals->SetTriangle(QuadTris.B, NormalTriangle2);
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}
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}
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void FDynamicMeshEditor::SetTriangleNormals(const TArray<int>& Triangles, const FVector3f& Normal)
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{
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check(Mesh->HasAttributes());
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FDynamicMeshNormalOverlay* Normals = Mesh->Attributes()->PrimaryNormals();
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TMap<int, int> Vertices;
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for (int tid : Triangles)
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{
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FIndex3i BaseTri = Mesh->GetTriangle(tid);
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FIndex3i ElemTri;
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for (int j = 0; j < 3; ++j)
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{
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const int* FoundElementID = Vertices.Find(BaseTri[j]);
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if (FoundElementID == nullptr)
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{
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ElemTri[j] = Normals->AppendElement(Normal, BaseTri[j]);
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Vertices.Add(BaseTri[j], ElemTri[j]);
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}
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else
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{
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ElemTri[j] = *FoundElementID;
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}
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}
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Normals->SetTriangle(tid, ElemTri);
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}
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}
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void FDynamicMeshEditor::SetTriangleUVsFromProjection(const TArray<int>& Triangles, const FFrame3d& ProjectionFrame, float UVScaleFactor, const FVector2f& UVTranslation, int UVLayerIndex)
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{
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if (!Triangles.Num())
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{
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return;
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}
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check(Mesh->HasAttributes() && Mesh->Attributes()->NumUVLayers() > UVLayerIndex);
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FDynamicMeshUVOverlay* UVs = Mesh->Attributes()->GetUVLayer(UVLayerIndex);
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TMap<int, int> BaseToOverlayVIDMap;
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TArray<int> AllUVIndices;
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FAxisAlignedBox2f UVBounds(FAxisAlignedBox2f::Empty());
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for (int TID : Triangles)
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{
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FIndex3i BaseTri = Mesh->GetTriangle(TID);
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FIndex3i ElemTri;
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for (int j = 0; j < 3; ++j)
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{
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const int* FoundElementID = BaseToOverlayVIDMap.Find(BaseTri[j]);
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if (FoundElementID == nullptr)
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{
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FVector2f UV = (FVector2f)ProjectionFrame.ToPlaneUV(Mesh->GetVertex(BaseTri[j]), 2);
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UVBounds.Contain(UV);
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ElemTri[j] = UVs->AppendElement(UV, BaseTri[j]);
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AllUVIndices.Add(ElemTri[j]);
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BaseToOverlayVIDMap.Add(BaseTri[j], ElemTri[j]);
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}
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else
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{
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ElemTri[j] = *FoundElementID;
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}
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}
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UVs->SetTriangle(TID, ElemTri);
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}
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// shift UVs so that their bbox min-corner is at origin and scaled by external scale factor
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for (int UVID : AllUVIndices)
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{
|
|
FVector2f UV = UVs->GetElement(UVID);
|
|
FVector2f TransformedUV = (UV - UVBounds.Min) * UVScaleFactor;
|
|
TransformedUV += UVTranslation;
|
|
UVs->SetElement(UVID, TransformedUV);
|
|
}
|
|
}
|
|
|
|
|
|
void FDynamicMeshEditor::SetQuadUVsFromProjection(const FIndex2i& QuadTris, const FFrame3d& ProjectionFrame, float UVScaleFactor, const FVector2f& UVTranslation, int UVLayerIndex)
|
|
{
|
|
check(Mesh->HasAttributes() && Mesh->Attributes()->NumUVLayers() > UVLayerIndex );
|
|
FDynamicMeshUVOverlay* UVs = Mesh->Attributes()->GetUVLayer(UVLayerIndex);
|
|
|
|
FIndex4i AllUVIndices(-1, -1, -1, -1);
|
|
FVector2f AllUVs[4];
|
|
|
|
// project first triangle
|
|
FIndex3i Triangle1 = Mesh->GetTriangle(QuadTris.A);
|
|
FIndex3i UVTriangle1;
|
|
for (int j = 0; j < 3; ++j)
|
|
{
|
|
FVector2f UV = (FVector2f)ProjectionFrame.ToPlaneUV(Mesh->GetVertex(Triangle1[j]), 2);
|
|
UVTriangle1[j] = UVs->AppendElement(UV, Triangle1[j]);
|
|
AllUVs[j] = UV;
|
|
AllUVIndices[j] = UVTriangle1[j];
|
|
}
|
|
UVs->SetTriangle(QuadTris.A, UVTriangle1);
|
|
|
|
// project second triangle
|
|
if (Mesh->IsTriangle(QuadTris.B))
|
|
{
|
|
FIndex3i Triangle2 = Mesh->GetTriangle(QuadTris.B);
|
|
FIndex3i UVTriangle2;
|
|
for (int j = 0; j < 3; ++j)
|
|
{
|
|
int i = Triangle1.IndexOf(Triangle2[j]);
|
|
if (i == -1)
|
|
{
|
|
FVector2f UV = (FVector2f)ProjectionFrame.ToPlaneUV(Mesh->GetVertex(Triangle2[j]), 2);
|
|
UVTriangle2[j] = UVs->AppendElement(UV, Triangle2[j]);
|
|
AllUVs[3] = UV;
|
|
AllUVIndices[3] = UVTriangle2[j];
|
|
}
|
|
else
|
|
{
|
|
UVTriangle2[j] = UVTriangle1[i];
|
|
}
|
|
}
|
|
UVs->SetTriangle(QuadTris.B, UVTriangle2);
|
|
}
|
|
|
|
// shift UVs so that their bbox min-corner is at origin and scaled by external scale factor
|
|
FAxisAlignedBox2f UVBounds(FAxisAlignedBox2f::Empty());
|
|
UVBounds.Contain(AllUVs[0]); UVBounds.Contain(AllUVs[1]); UVBounds.Contain(AllUVs[2]);
|
|
if (AllUVIndices[3] != -1)
|
|
{
|
|
UVBounds.Contain(AllUVs[3]);
|
|
}
|
|
for (int j = 0; j < 4; ++j)
|
|
{
|
|
if (AllUVIndices[j] != -1)
|
|
{
|
|
FVector2f TransformedUV = (AllUVs[j] - UVBounds.Min) * UVScaleFactor;
|
|
TransformedUV += UVTranslation;
|
|
UVs->SetElement(AllUVIndices[j], TransformedUV);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void FDynamicMeshEditor::RescaleAttributeUVs(float UVScale, bool bWorldSpace, int UVLayerIndex, TOptional<FTransform3d> ToWorld)
|
|
{
|
|
check(Mesh->HasAttributes() && Mesh->Attributes()->NumUVLayers() > UVLayerIndex );
|
|
FDynamicMeshUVOverlay* UVs = Mesh->Attributes()->GetUVLayer(UVLayerIndex);
|
|
|
|
if (bWorldSpace)
|
|
{
|
|
FVector2f TriUVs[3];
|
|
FVector3d TriVs[3];
|
|
float TotalEdgeUVLen = 0;
|
|
double TotalEdgeLen = 0;
|
|
for (int TID : Mesh->TriangleIndicesItr())
|
|
{
|
|
UVs->GetTriElements(TID, TriUVs[0], TriUVs[1], TriUVs[2]);
|
|
Mesh->GetTriVertices(TID, TriVs[0], TriVs[1], TriVs[2]);
|
|
if (ToWorld.IsSet())
|
|
{
|
|
for (int i = 0; i < 3; i++)
|
|
{
|
|
TriVs[i] = ToWorld->TransformPosition(TriVs[i]);
|
|
}
|
|
}
|
|
for (int j = 2, i = 0; i < 3; j = i++)
|
|
{
|
|
TotalEdgeUVLen += TriUVs[j].Distance(TriUVs[i]);
|
|
TotalEdgeLen += TriVs[j].Distance(TriVs[i]);
|
|
}
|
|
}
|
|
if (TotalEdgeUVLen > KINDA_SMALL_NUMBER)
|
|
{
|
|
float AvgUVScale = TotalEdgeLen / TotalEdgeUVLen;
|
|
UVScale *= AvgUVScale;
|
|
}
|
|
}
|
|
|
|
for (int UVID : UVs->ElementIndicesItr())
|
|
{
|
|
FVector2f UV;
|
|
UVs->GetElement(UVID, UV);
|
|
UVs->SetElement(UVID, UV*UVScale);
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
void FDynamicMeshEditor::ReverseTriangleOrientations(const TArray<int>& Triangles, bool bInvertNormals)
|
|
{
|
|
for (int tid : Triangles)
|
|
{
|
|
Mesh->ReverseTriOrientation(tid);
|
|
}
|
|
if (bInvertNormals)
|
|
{
|
|
InvertTriangleNormals(Triangles);
|
|
}
|
|
}
|
|
|
|
|
|
void FDynamicMeshEditor::InvertTriangleNormals(const TArray<int>& Triangles)
|
|
{
|
|
// @todo re-use the TBitA
|
|
|
|
if (Mesh->HasVertexNormals())
|
|
{
|
|
TBitArray<FDefaultBitArrayAllocator> DoneVertices(false, Mesh->MaxVertexID());
|
|
for (int TriangleID : Triangles)
|
|
{
|
|
FIndex3i Tri = Mesh->GetTriangle(TriangleID);
|
|
for (int j = 0; j < 3; ++j)
|
|
{
|
|
if (DoneVertices[Tri[j]] == false)
|
|
{
|
|
Mesh->SetVertexNormal(Tri[j], -Mesh->GetVertexNormal(Tri[j]));
|
|
DoneVertices[Tri[j]] = true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
if (Mesh->HasAttributes())
|
|
{
|
|
for (FDynamicMeshNormalOverlay* Normals : Mesh->Attributes()->GetAllNormalLayers())
|
|
{
|
|
TBitArray<FDefaultBitArrayAllocator> DoneNormals(false, Normals->MaxElementID());
|
|
for (int TriangleID : Triangles)
|
|
{
|
|
FIndex3i ElemTri = Normals->GetTriangle(TriangleID);
|
|
for (int j = 0; j < 3; ++j)
|
|
{
|
|
if (DoneNormals[ElemTri[j]] == false)
|
|
{
|
|
Normals->SetElement(ElemTri[j], -Normals->GetElement(ElemTri[j]));
|
|
DoneNormals[ElemTri[j]] = true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void FDynamicMeshEditor::CopyAttributes(int FromTriangleID, int ToTriangleID, FMeshIndexMappings& IndexMaps, FDynamicMeshEditResult& ResultOut)
|
|
{
|
|
if (Mesh->HasAttributes() == false)
|
|
{
|
|
return;
|
|
}
|
|
|
|
|
|
for (int UVLayerIndex = 0; UVLayerIndex < Mesh->Attributes()->NumUVLayers(); UVLayerIndex++)
|
|
{
|
|
FDynamicMeshUVOverlay* UVOverlay = Mesh->Attributes()->GetUVLayer(UVLayerIndex);
|
|
FIndex3i FromElemTri = UVOverlay->GetTriangle(FromTriangleID);
|
|
FIndex3i ToElemTri = UVOverlay->GetTriangle(ToTriangleID);
|
|
for (int j = 0; j < 3; ++j)
|
|
{
|
|
if (FromElemTri[j] != FDynamicMesh3::InvalidID )
|
|
{
|
|
int NewElemID = FindOrCreateDuplicateUV(FromElemTri[j], UVLayerIndex, IndexMaps);
|
|
ToElemTri[j] = NewElemID;
|
|
}
|
|
}
|
|
UVOverlay->SetTriangle(ToTriangleID, ToElemTri);
|
|
}
|
|
|
|
|
|
int NormalLayerIndex = 0;
|
|
for (FDynamicMeshNormalOverlay* NormalOverlay : Mesh->Attributes()->GetAllNormalLayers())
|
|
{
|
|
FIndex3i FromElemTri = NormalOverlay->GetTriangle(FromTriangleID);
|
|
FIndex3i ToElemTri = NormalOverlay->GetTriangle(ToTriangleID);
|
|
for (int j = 0; j < 3; ++j)
|
|
{
|
|
if (FromElemTri[j] != FDynamicMesh3::InvalidID)
|
|
{
|
|
int NewElemID = FindOrCreateDuplicateNormal(FromElemTri[j], NormalLayerIndex, IndexMaps);
|
|
ToElemTri[j] = NewElemID;
|
|
}
|
|
}
|
|
NormalOverlay->SetTriangle(ToTriangleID, ToElemTri);
|
|
NormalLayerIndex++;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
int FDynamicMeshEditor::FindOrCreateDuplicateUV(int ElementID, int UVLayerIndex, FMeshIndexMappings& IndexMaps)
|
|
{
|
|
int NewElementID = IndexMaps.GetNewUV(UVLayerIndex, ElementID);
|
|
if (NewElementID == IndexMaps.InvalidID())
|
|
{
|
|
FDynamicMeshUVOverlay* UVOverlay = Mesh->Attributes()->GetUVLayer(UVLayerIndex);
|
|
|
|
// need to determine new parent vertex. It should be in the map already!
|
|
int ParentVertexID = UVOverlay->GetParentVertex(ElementID);
|
|
int NewParentVertexID = IndexMaps.GetNewVertex(ParentVertexID);
|
|
check(NewParentVertexID != IndexMaps.InvalidID());
|
|
|
|
NewElementID = UVOverlay->AppendElement(
|
|
UVOverlay->GetElement(ElementID), NewParentVertexID);
|
|
|
|
IndexMaps.SetUV(UVLayerIndex, ElementID, NewElementID);
|
|
}
|
|
return NewElementID;
|
|
}
|
|
|
|
|
|
|
|
int FDynamicMeshEditor::FindOrCreateDuplicateNormal(int ElementID, int NormalLayerIndex, FMeshIndexMappings& IndexMaps)
|
|
{
|
|
int NewElementID = IndexMaps.GetNewNormal(NormalLayerIndex, ElementID);
|
|
if (NewElementID == IndexMaps.InvalidID())
|
|
{
|
|
FDynamicMeshNormalOverlay* NormalOverlay = Mesh->Attributes()->GetNormalLayer(NormalLayerIndex);
|
|
|
|
// need to determine new parent vertex. It should be in the map already!
|
|
int ParentVertexID = NormalOverlay->GetParentVertex(ElementID);
|
|
int NewParentVertexID = IndexMaps.GetNewVertex(ParentVertexID);
|
|
check(NewParentVertexID != IndexMaps.InvalidID());
|
|
|
|
NewElementID = NormalOverlay->AppendElement(
|
|
NormalOverlay->GetElement(ElementID), NewParentVertexID);
|
|
|
|
IndexMaps.SetNormal(NormalLayerIndex, ElementID, NewElementID);
|
|
}
|
|
return NewElementID;
|
|
}
|
|
|
|
|
|
|
|
int FDynamicMeshEditor::FindOrCreateDuplicateVertex(int VertexID, FMeshIndexMappings& IndexMaps, FDynamicMeshEditResult& ResultOut)
|
|
{
|
|
int NewVertexID = IndexMaps.GetNewVertex(VertexID);
|
|
if (NewVertexID == IndexMaps.InvalidID())
|
|
{
|
|
NewVertexID = Mesh->AppendVertex(*Mesh, VertexID);
|
|
IndexMaps.SetVertex(VertexID, NewVertexID);
|
|
ResultOut.NewVertices.Add(NewVertexID);
|
|
}
|
|
return NewVertexID;
|
|
}
|
|
|
|
|
|
|
|
int FDynamicMeshEditor::FindOrCreateDuplicateGroup(int TriangleID, FMeshIndexMappings& IndexMaps, FDynamicMeshEditResult& ResultOut)
|
|
{
|
|
int GroupID = Mesh->GetTriangleGroup(TriangleID);
|
|
int NewGroupID = IndexMaps.GetNewGroup(GroupID);
|
|
if (NewGroupID == IndexMaps.InvalidID())
|
|
{
|
|
NewGroupID = Mesh->AllocateTriangleGroup();
|
|
IndexMaps.SetGroup(GroupID, NewGroupID);
|
|
ResultOut.NewGroups.Add(NewGroupID);
|
|
}
|
|
return NewGroupID;
|
|
}
|
|
|
|
|
|
|
|
|
|
void FDynamicMeshEditor::AppendMesh(const FDynamicMesh3* AppendMesh,
|
|
FMeshIndexMappings& IndexMapsOut,
|
|
TFunction<FVector3d(int, const FVector3d&)> PositionTransform,
|
|
TFunction<FVector3d(int, const FVector3d&)> NormalTransform)
|
|
{
|
|
// todo: handle this case by making a copy?
|
|
check(AppendMesh != Mesh);
|
|
|
|
IndexMapsOut.Reset();
|
|
IndexMapsOut.Initialize(Mesh);
|
|
|
|
FIndexMapi& VertexMap = IndexMapsOut.GetVertexMap();
|
|
VertexMap.Reserve(AppendMesh->VertexCount());
|
|
for (int VertID : AppendMesh->VertexIndicesItr())
|
|
{
|
|
FVector3d Position = AppendMesh->GetVertex(VertID);
|
|
if (PositionTransform != nullptr)
|
|
{
|
|
Position = PositionTransform(VertID, Position);
|
|
}
|
|
int NewVertID = Mesh->AppendVertex(Position);
|
|
VertexMap.Add(VertID, NewVertID);
|
|
|
|
if (AppendMesh->HasVertexNormals() && Mesh->HasVertexNormals())
|
|
{
|
|
FVector3f Normal = AppendMesh->GetVertexNormal(VertID);
|
|
if (NormalTransform != nullptr)
|
|
{
|
|
Normal = (FVector3f)NormalTransform(VertID, (FVector3d)Normal);
|
|
}
|
|
Mesh->SetVertexNormal(NewVertID, Normal);
|
|
}
|
|
|
|
if (AppendMesh->HasVertexColors() && Mesh->HasVertexColors())
|
|
{
|
|
FVector3f Color = AppendMesh->GetVertexColor(VertID);
|
|
Mesh->SetVertexColor(NewVertID, Color);
|
|
}
|
|
}
|
|
|
|
FIndexMapi& TriangleMap = IndexMapsOut.GetTriangleMap();
|
|
bool bAppendGroups = AppendMesh->HasTriangleGroups() && Mesh->HasTriangleGroups();
|
|
FIndexMapi& GroupsMap = IndexMapsOut.GetGroupMap();
|
|
for (int TriID : AppendMesh->TriangleIndicesItr())
|
|
{
|
|
// append trigroup
|
|
int GroupID = FDynamicMesh3::InvalidID;
|
|
if (bAppendGroups)
|
|
{
|
|
GroupID = AppendMesh->GetTriangleGroup(TriID);
|
|
if (GroupID != FDynamicMesh3::InvalidID)
|
|
{
|
|
const int* FoundNewGroupID = GroupsMap.FindTo(GroupID);
|
|
if (FoundNewGroupID == nullptr)
|
|
{
|
|
int NewGroupID = Mesh->AllocateTriangleGroup();
|
|
GroupsMap.Add(GroupID, NewGroupID);
|
|
GroupID = NewGroupID;
|
|
}
|
|
else
|
|
{
|
|
GroupID = *FoundNewGroupID;
|
|
}
|
|
}
|
|
}
|
|
|
|
FIndex3i Tri = AppendMesh->GetTriangle(TriID);
|
|
int NewTriID = Mesh->AppendTriangle(VertexMap.GetTo(Tri.A), VertexMap.GetTo(Tri.B), VertexMap.GetTo(Tri.C), GroupID);
|
|
TriangleMap.Add(TriID, NewTriID);
|
|
}
|
|
|
|
|
|
// @todo support multiple UV/normal layer copying
|
|
// @todo can we have a template fn that does this?
|
|
|
|
if (AppendMesh->HasAttributes() && Mesh->HasAttributes())
|
|
{
|
|
const FDynamicMeshNormalOverlay* FromNormals = AppendMesh->Attributes()->PrimaryNormals();
|
|
FDynamicMeshNormalOverlay* ToNormals = Mesh->Attributes()->PrimaryNormals();
|
|
if (FromNormals != nullptr && ToNormals != nullptr)
|
|
{
|
|
FIndexMapi& NormalMap = IndexMapsOut.GetNormalMap(0);
|
|
NormalMap.Reserve(FromNormals->ElementCount());
|
|
AppendNormals(AppendMesh, FromNormals, ToNormals,
|
|
VertexMap, TriangleMap, NormalTransform, NormalMap);
|
|
}
|
|
|
|
|
|
int NumUVLayers = FMath::Min(Mesh->Attributes()->NumUVLayers(), AppendMesh->Attributes()->NumUVLayers());
|
|
for (int UVLayerIndex = 0; UVLayerIndex < NumUVLayers; UVLayerIndex++)
|
|
{
|
|
const FDynamicMeshUVOverlay* FromUVs = AppendMesh->Attributes()->GetUVLayer(UVLayerIndex);
|
|
FDynamicMeshUVOverlay* ToUVs = Mesh->Attributes()->GetUVLayer(UVLayerIndex);
|
|
if (FromUVs != nullptr && ToUVs != nullptr)
|
|
{
|
|
FIndexMapi& UVMap = IndexMapsOut.GetUVMap(0);
|
|
UVMap.Reserve(FromUVs->ElementCount());
|
|
AppendUVs(AppendMesh, FromUVs, ToUVs,
|
|
VertexMap, TriangleMap, UVMap);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
|
|
void FDynamicMeshEditor::AppendNormals(const FDynamicMesh3* AppendMesh,
|
|
const FDynamicMeshNormalOverlay* FromNormals, FDynamicMeshNormalOverlay* ToNormals,
|
|
const FIndexMapi& VertexMap, const FIndexMapi& TriangleMap,
|
|
TFunction<FVector3d(int, const FVector3d&)> NormalTransform,
|
|
FIndexMapi& NormalMapOut)
|
|
{
|
|
// copy over normals
|
|
for (int ElemID : FromNormals->ElementIndicesItr())
|
|
{
|
|
int ParentVertID = FromNormals->GetParentVertex(ElemID);
|
|
FVector3f Normal = FromNormals->GetElement(ElemID);
|
|
if (NormalTransform != nullptr)
|
|
{
|
|
Normal = (FVector3f)NormalTransform(ParentVertID, (FVector3d)Normal);
|
|
}
|
|
int NewElemID = ToNormals->AppendElement(Normal, VertexMap.GetTo(ParentVertID));
|
|
NormalMapOut.Add(ElemID, NewElemID);
|
|
}
|
|
|
|
// now set new triangles
|
|
for (int TriID : AppendMesh->TriangleIndicesItr())
|
|
{
|
|
FIndex3i ElemTri = FromNormals->GetTriangle(TriID);
|
|
int NewTriID = TriangleMap.GetTo(TriID);
|
|
for (int j = 0; j < 3; ++j)
|
|
{
|
|
ElemTri[j] = FromNormals->IsElement(ElemTri[j]) ? NormalMapOut.GetTo(ElemTri[j]) : FDynamicMesh3::InvalidID;
|
|
}
|
|
ToNormals->SetTriangle(NewTriID, ElemTri);
|
|
}
|
|
}
|
|
|
|
|
|
void FDynamicMeshEditor::AppendUVs(const FDynamicMesh3* AppendMesh,
|
|
const FDynamicMeshUVOverlay* FromUVs, FDynamicMeshUVOverlay* ToUVs,
|
|
const FIndexMapi& VertexMap, const FIndexMapi& TriangleMap,
|
|
FIndexMapi& UVMapOut)
|
|
{
|
|
// copy over uv elements
|
|
for (int ElemID : FromUVs->ElementIndicesItr())
|
|
{
|
|
int ParentVertID = FromUVs->GetParentVertex(ElemID);
|
|
FVector2f UV = FromUVs->GetElement(ElemID);
|
|
int NewElemID = ToUVs->AppendElement(UV, VertexMap.GetTo(ParentVertID));
|
|
UVMapOut.Add(ElemID, NewElemID);
|
|
}
|
|
|
|
// now set new triangles
|
|
for (int TriID : AppendMesh->TriangleIndicesItr())
|
|
{
|
|
FIndex3i ElemTri = FromUVs->GetTriangle(TriID);
|
|
int NewTriID = TriangleMap.GetTo(TriID);
|
|
for (int j = 0; j < 3; ++j)
|
|
{
|
|
ElemTri[j] = FromUVs->IsElement(ElemTri[j]) ? UVMapOut.GetTo(ElemTri[j]) : FDynamicMesh3::InvalidID;
|
|
}
|
|
ToUVs->SetTriangle(NewTriID, ElemTri);
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
// can these be replaced w/ template function?
|
|
|
|
// Utility function for ::AppendTriangles()
|
|
static int AppendTriangleUVAttribute(const FDynamicMesh3* FromMesh, int FromElementID, FDynamicMesh3* ToMesh, int UVLayerIndex, FMeshIndexMappings& IndexMaps)
|
|
{
|
|
int NewElementID = IndexMaps.GetNewUV(UVLayerIndex, FromElementID);
|
|
if (NewElementID == IndexMaps.InvalidID())
|
|
{
|
|
const FDynamicMeshUVOverlay* FromUVOverlay = FromMesh->Attributes()->GetUVLayer(UVLayerIndex);
|
|
FDynamicMeshUVOverlay* ToUVOverlay = ToMesh->Attributes()->GetUVLayer(UVLayerIndex);
|
|
|
|
// need to determine new parent vertex. It should be in the map already!
|
|
int ParentVertexID = FromUVOverlay->GetParentVertex(FromElementID);
|
|
int NewParentVertexID = IndexMaps.GetNewVertex(ParentVertexID);
|
|
check(NewParentVertexID != IndexMaps.InvalidID());
|
|
|
|
NewElementID = ToUVOverlay->AppendElement(
|
|
FromUVOverlay->GetElement(FromElementID), NewParentVertexID);
|
|
|
|
IndexMaps.SetUV(UVLayerIndex, FromElementID, NewElementID);
|
|
}
|
|
return NewElementID;
|
|
}
|
|
|
|
|
|
// Utility function for ::AppendTriangles()
|
|
static int AppendTriangleNormalAttribute(const FDynamicMesh3* FromMesh, int FromElementID, FDynamicMesh3* ToMesh, int NormalLayerIndex, FMeshIndexMappings& IndexMaps)
|
|
{
|
|
int NewElementID = IndexMaps.GetNewNormal(NormalLayerIndex, FromElementID);
|
|
if (NewElementID == IndexMaps.InvalidID())
|
|
{
|
|
const FDynamicMeshNormalOverlay* FromNormalOverlay = FromMesh->Attributes()->GetNormalLayer(NormalLayerIndex);
|
|
FDynamicMeshNormalOverlay* ToNormalOverlay = ToMesh->Attributes()->GetNormalLayer(NormalLayerIndex);
|
|
|
|
// need to determine new parent vertex. It should be in the map already!
|
|
int ParentVertexID = FromNormalOverlay->GetParentVertex(FromElementID);
|
|
int NewParentVertexID = IndexMaps.GetNewVertex(ParentVertexID);
|
|
check(NewParentVertexID != IndexMaps.InvalidID());
|
|
|
|
NewElementID = ToNormalOverlay->AppendElement(
|
|
FromNormalOverlay->GetElement(FromElementID), NewParentVertexID);
|
|
|
|
IndexMaps.SetNormal(NormalLayerIndex, FromElementID, NewElementID);
|
|
}
|
|
return NewElementID;
|
|
}
|
|
|
|
|
|
|
|
|
|
// Utility function for ::AppendTriangles()
|
|
static void AppendAttributes(const FDynamicMesh3* FromMesh, int FromTriangleID, FDynamicMesh3* ToMesh, int ToTriangleID, FMeshIndexMappings& IndexMaps, FDynamicMeshEditResult& ResultOut)
|
|
{
|
|
if (FromMesh->HasAttributes() == false || ToMesh->HasAttributes() == false)
|
|
{
|
|
return;
|
|
}
|
|
|
|
// todo: if we ever support multiple normal layers, copy them all
|
|
check(FromMesh->Attributes()->NumNormalLayers() == 1);
|
|
|
|
for (int UVLayerIndex = 0; UVLayerIndex < FMath::Min(FromMesh->Attributes()->NumUVLayers(), ToMesh->Attributes()->NumUVLayers()); UVLayerIndex++)
|
|
{
|
|
const FDynamicMeshUVOverlay* FromUVOverlay = FromMesh->Attributes()->GetUVLayer(UVLayerIndex);
|
|
FDynamicMeshUVOverlay* ToUVOverlay = ToMesh->Attributes()->GetUVLayer(UVLayerIndex);
|
|
FIndex3i FromElemTri = FromUVOverlay->GetTriangle(FromTriangleID);
|
|
FIndex3i ToElemTri = ToUVOverlay->GetTriangle(ToTriangleID);
|
|
for (int j = 0; j < 3; ++j)
|
|
{
|
|
if (FromElemTri[j] != FDynamicMesh3::InvalidID)
|
|
{
|
|
int NewElemID = AppendTriangleUVAttribute(FromMesh, FromElemTri[j], ToMesh, 0, IndexMaps);
|
|
ToElemTri[j] = NewElemID;
|
|
}
|
|
}
|
|
ToUVOverlay->SetTriangle(ToTriangleID, ToElemTri);
|
|
}
|
|
|
|
|
|
const FDynamicMeshNormalOverlay* FromNormalOverlay = FromMesh->Attributes()->PrimaryNormals();
|
|
FDynamicMeshNormalOverlay* ToNormalOverlay = ToMesh->Attributes()->PrimaryNormals();
|
|
|
|
{
|
|
FIndex3i FromElemTri = FromNormalOverlay->GetTriangle(FromTriangleID);
|
|
FIndex3i ToElemTri = ToNormalOverlay->GetTriangle(ToTriangleID);
|
|
for (int j = 0; j < 3; ++j)
|
|
{
|
|
if (FromElemTri[j] != FDynamicMesh3::InvalidID)
|
|
{
|
|
int NewElemID = AppendTriangleNormalAttribute(FromMesh, FromElemTri[j], ToMesh, 0, IndexMaps);
|
|
ToElemTri[j] = NewElemID;
|
|
}
|
|
}
|
|
ToNormalOverlay->SetTriangle(ToTriangleID, ToElemTri);
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
void FDynamicMeshEditor::AppendTriangles(const FDynamicMesh3* SourceMesh, const TArray<int>& SourceTriangles, FMeshIndexMappings& IndexMaps, FDynamicMeshEditResult& ResultOut)
|
|
{
|
|
ResultOut.Reset();
|
|
IndexMaps.Initialize(Mesh);
|
|
|
|
for (int SourceTriangleID : SourceTriangles)
|
|
{
|
|
check(SourceMesh->IsTriangle(SourceTriangleID));
|
|
if (SourceMesh->IsTriangle(SourceTriangleID) == false)
|
|
{
|
|
continue; // ignore missing triangles
|
|
}
|
|
|
|
FIndex3i Tri = SourceMesh->GetTriangle(SourceTriangleID);
|
|
|
|
// FindOrCreateDuplicateGroup
|
|
int SourceGroupID = SourceMesh->GetTriangleGroup(SourceTriangleID);
|
|
int NewGroupID = IndexMaps.GetNewGroup(SourceGroupID);
|
|
if (NewGroupID == IndexMaps.InvalidID())
|
|
{
|
|
NewGroupID = Mesh->AllocateTriangleGroup();
|
|
IndexMaps.SetGroup(SourceGroupID, NewGroupID);
|
|
ResultOut.NewGroups.Add(NewGroupID);
|
|
}
|
|
|
|
// FindOrCreateDuplicateVertex
|
|
FIndex3i NewTri;
|
|
for (int j = 0; j < 3; ++j)
|
|
{
|
|
int SourceVertexID = Tri[j];
|
|
int NewVertexID = IndexMaps.GetNewVertex(SourceVertexID);
|
|
if (NewVertexID == IndexMaps.InvalidID())
|
|
{
|
|
NewVertexID = Mesh->AppendVertex(*SourceMesh, SourceVertexID);
|
|
IndexMaps.SetVertex(SourceVertexID, NewVertexID);
|
|
ResultOut.NewVertices.Add(NewVertexID);
|
|
}
|
|
NewTri[j] = NewVertexID;
|
|
}
|
|
|
|
int NewTriangleID = Mesh->AppendTriangle(NewTri, NewGroupID);
|
|
IndexMaps.SetTriangle(SourceTriangleID, NewTriangleID);
|
|
ResultOut.NewTriangles.Add(NewTriangleID);
|
|
|
|
AppendAttributes(SourceMesh, SourceTriangleID, Mesh, NewTriangleID, IndexMaps, ResultOut);
|
|
|
|
//Mesh->CheckValidity(true);
|
|
}
|
|
}
|