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Fixed an issue with mesh normals when Unity exports them to Houdini #35

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Fixed an issue with mesh normals when Unity exports them to Houdini #35

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7 changes: 6 additions & 1 deletion Plugins/HoudiniEngineUnity/Scripts/Utility/HEU_InputInterfaceMesh.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -285,6 +285,7 @@ public bool UploadData(HEU_SessionBase session, HAPI_NodeId inputNodeID, HEU_Inp
{
Vector3[] meshVertices = inputDataMeshes._inputMeshes[i]._mesh.vertices;
Matrix4x4 localToWorld = rootInvertTransformMatrix * inputDataMeshes._inputMeshes[i]._transform.localToWorldMatrix;
Matrix4x4 worldToLocalTransposed = localToWorld.inverse.transpose;

List<Vector3> uniqueVertices = new List<Vector3>();

Expand Down Expand Up @@ -366,7 +367,11 @@ public bool UploadData(HEU_SessionBase session, HAPI_NodeId inputNodeID, HEU_Inp

if (meshNormals != null && (originalIndex < meshNormals.Length))
{
normals.Add(meshNormals[originalIndex]);
Vector3 normalLocalSpace = meshNormals[originalIndex];
Vector3 normalWorldSpace = worldToLocalTransposed * normalLocalSpace;
if (normalWorldSpace.sqrMagnitude > 0f)
normalWorldSpace.Normalize();
normals.Add(normalWorldSpace);
}

for (int u = 0; u < NumUVSets; ++u)
Expand Down