feat(scene): support whole-model transparency - #21
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Port of upstream gpu commit a88ac64d5: fold Model.getTransparency() into each face's packed alpha via the stock faceTransparency blend, and force the sorted/alpha capture path when it is non-zero. Without this, models using the new whole-model fade render fully opaque. Model transparency is per-renderable and mutable, so it stays out of the ModelFaceCache key.
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Port of upstream gpu commit a88ac64d5: fold Model.getTransparency() into each face's packed alpha via the stock faceTransparency blend, and force the sorted/alpha capture path when it is non-zero. Without this, models using the new whole-model fade render fully opaque.
Model transparency is per-renderable and mutable, so it stays out of the ModelFaceCache key.