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Why not EvaluateGlobalTransform at render stage?

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I'm trying to deal with FBX format and FBX SDK, importing fbx into my engine. I'm reading node by node, gathering their transform matricies.

Then, during render process, I will have to apply eache appropriate matrix on eache node, walking through the node's hierarchy. But is it a right way? Why not using "cluster->GetLink()->EvaluateGlobalTransform( Time) " at render stage? Will it be slower? Does it apply interpolation between frames?

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