69 lines
2.4 KiB
C++
69 lines
2.4 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#include "MeshPaintSplineMeshAdapter.h"
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#include "StaticMeshResources.h"
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#include "Components/SplineMeshComponent.h"
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//////////////////////////////////////////////////////////////////////////
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// FMeshPaintGeometryAdapterForSplineMeshes
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bool FMeshPaintGeometryAdapterForSplineMeshes::InitializeVertexData()
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{
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// Cache deformed spline mesh vertices for quick lookup during painting / previewing
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USplineMeshComponent* SplineMeshComponent = Cast<USplineMeshComponent>(StaticMeshComponent);
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check(SplineMeshComponent);
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bool bValid = false;
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if (LODModel)
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{
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// Retrieve vertex and index data
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const int32 NumVertices = LODModel->VertexBuffers.PositionVertexBuffer.GetNumVertices();
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MeshVertices.Reset();
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MeshVertices.AddDefaulted(NumVertices);
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// Apply spline vertex deformation to each vertex
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for (int32 Index = 0; Index < NumVertices; Index++)
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{
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FVector Position = (FVector)LODModel->VertexBuffers.PositionVertexBuffer.VertexPosition(Index);
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const FTransform SliceTransform = SplineMeshComponent->CalcSliceTransform(USplineMeshComponent::GetAxisValueRef(Position, SplineMeshComponent->ForwardAxis));
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USplineMeshComponent::GetAxisValueRef(Position, SplineMeshComponent->ForwardAxis) = 0;
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MeshVertices[Index] = SliceTransform.TransformPosition(Position);
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}
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const int32 NumIndices = LODModel->IndexBuffer.GetNumIndices();
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MeshIndices.Reset();
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MeshIndices.AddDefaulted(NumIndices);
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const FIndexArrayView ArrayView = LODModel->IndexBuffer.GetArrayView();
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for (int32 Index = 0; Index < NumIndices; Index++)
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{
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MeshIndices[Index] = ArrayView[Index];
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}
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bValid = (MeshVertices.Num() > 0 && MeshIndices.Num() > 0);
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}
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return bValid;
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}
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//////////////////////////////////////////////////////////////////////////
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// FMeshPaintGeometryAdapterForSplineMeshesFactory
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TSharedPtr<IMeshPaintGeometryAdapter> FMeshPaintGeometryAdapterForSplineMeshesFactory::Construct(class UMeshComponent* InComponent, int32 MeshLODIndex) const
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{
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if (USplineMeshComponent* SplineMeshComponent = Cast<USplineMeshComponent>(InComponent))
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{
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if (SplineMeshComponent->GetStaticMesh() != nullptr)
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{
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TSharedRef<FMeshPaintGeometryAdapterForSplineMeshes> Result = MakeShareable(new FMeshPaintGeometryAdapterForSplineMeshes());
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if (Result->Construct(InComponent, MeshLODIndex))
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{
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return Result;
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}
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}
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}
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return nullptr;
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}
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