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Read Static Mesh Data into Procedural Mesh

Hey Guys, So I'm currently working on reading in the render data from a static mesh and using it to create a procedural mesh so I can deform it at runtime, but running into issues with getting the mesh to render properly. Here's the current function I have for reading in the render data using it:

 void AProceduralLandscape::GenerateLandscape()
     TArray<FVector> vertices;
     TArray<int32> triangles;
     TArray<FVector> normals;
     TArray<FVector2D> UV0;
     TArray<FColor> vertexColors;
     TArray<FProcMeshTangent> tangents;
     if (LandscapeReference)
         FPositionVertexBuffer* vertexPositionBuffer = &LandscapeReference->RenderData->LODResources[0].PositionVertexBuffer;
         FRawStaticIndexBuffer* indexBuffer = &LandscapeReference->RenderData->LODResources[0].IndexBuffer;
         FStaticMeshVertexBuffer* vertexBuffer = &LandscapeReference->RenderData->LODResources[0].VertexBuffer;
         if (vertexPositionBuffer)
             const int32 vertexCount = vertexPositionBuffer->GetNumVertices();
             for (int32 i = 0; i < vertexCount; i++)
                 normals.Add(FVector(1, 0, 0));
                 vertexColors.Add(FColor(100, 100, 100, 100));
                 tangents.Add(FProcMeshTangent(vertexBuffer->VertexTangentX(i).Vector.X, vertexBuffer->VertexTangentX(i).Vector.Y, vertexBuffer->VertexTangentX(i).Vector.Z));
         LandscapeMesh->CreateMeshSection(1, vertices, triangles, normals, UV0, vertexColors, tangents, false); 
         UE_LOG(LogTemp, Warning, TEXT("CREATED LANDSCAPE"));


Currently it'll render only the first 1/3 of the mesh. My hunch is the hard-coded normals I'm using for generation, but I can't really find any normal info inside FStaticMeshLODResources. Any ideas? Thanks

Product Version: UE 4.11
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asked May 09 '16 at 04:25 AM in C++ Programming

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1 answer: sort voted first

You're not getting all of the indices. With a triangle list that actually uses the indices correctly it will have quite a few more indices than vertices. Best thing to do is a separate loop that looks at indexBuffer.GetNumIndices() and copies all of them to the triangles array you have.

For an example, it's possible to have a cube with only 8 vertices but still need 36 indices to makeup all 12 triangles.

To copy the indices, something like this should get them all.

 for (int32 = 0; i < indexBuffer.GetNumIndices(); i++)
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answered May 09 '16 at 05:07 AM

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avatar image Regalith May 09 '16 at 05:57 AM

That was exactly the issue, thanks! I should probably find a book on graphics since I never realized the reason behind indices.

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