Fix meshlet vertex attribute interpolation #13775
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The code is clear and reasonable, and I trust your testing and motivation here. This gets an LGTM. @atlv24 could you take a look?
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# Objective - Mikktspace requires that we normalize world normals/tangents _before_ interpolation across vertices, and then do _not_ normalize after. I had it backwards. - We do not (am not supposed to?) need a second set of barycentrics for motion vectors. If you think about the typical raster pipeline, in the vertex shader we calculate previous_world_position, and then it gets interpolated using the current triangle's barycentrics. ## Solution - Fix normal/tangent processing - Reuse barycentrics for motion vector calculations - Not implementing this for 0.14, but long term I aim to remove explicit vertex tangents and calculate them in the shader on the fly. ## Testing - I tested out some of the normal maps we have in repo. Didn't seem to make a difference, but mikktspace is all about correctness across various baking tools. I probably just didn't have any of the ones that would cause it to break. - Didn't test motion vectors as there's a known bug with the depth buffer and meshlets that I'm waiting on the render graph rewrite to fix.
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Objective
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