SSGINode: Distinct between uv and direction sampling. #31865
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Mugen87
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Related issue: #31839
Description
The PR makes sure
SSGINodedistincts uv and direction sampling. In Unity, both could use the same values. In WebGPU however there are different uv conventions soSSGINodeneeds to compute uv offset separately.This change does not alter the visual output but it improves the code clarity.