private static void UpdateDecalPositions(InstancingId id, List <MyCubeInstanceData> instanceData, List <MyCubeInstanceDecalData> decals)
{
m_tmpDecalsUpdate.Clear();
for (int it1 = 0; it1 < decals.Count; it1++)
{
MyCubeInstanceDecalData decal = decals[it1];
MyCubeInstanceData cubeData = instanceData[decal.InstanceIndex];
if (!cubeData.EnableSkinning)
{
break;
}
MyDecalTopoData decalTopo;
bool found = MyScreenDecals.GetDecalTopoData(decal.DecalId, out decalTopo);
if (!found)
{
continue;
}
Matrix localCubeMatrix;
Matrix skinningMatrix = cubeData.ConstructDeformedCubeInstanceMatrix(ref decalTopo.BoneIndices, ref decalTopo.BoneWeights, out localCubeMatrix);
Matrix localCubeMatrixInv;
Matrix.Invert(ref localCubeMatrix, out localCubeMatrixInv);
// TODO: Optimization: it would be cool if we keep original cube coordiates local intersection
// and avoid matrix inversion here. Refer to MyCubeGrid.GetIntersectionWithLine(), MyCubeGridHitInfo
Matrix invBinding = decalTopo.MatrixBinding * localCubeMatrixInv;
Matrix transform = invBinding * skinningMatrix;
m_tmpDecalsUpdate.Add(new MyDecalPositionUpdate()
{
ID = decal.DecalId, Transform = transform
});
}
MyScreenDecals.UpdateDecals(m_tmpDecalsUpdate);
}
