PickFromForeignMaterial read rend.sharedMaterial, which is always slot 0, so any renderer with several materials (one per submesh) always sampled the first material's values. Resolve the submesh from the hit triangle (collider triangleIndex, or the recovered render-mesh triangle) and read sharedMaterials[submesh] (clamped) instead. Single-material renderers stay on slot 0, byte-identical to before.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
adminandClaude Opus 4.8
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