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  • $Cs, Source image color (vector)
  • $u$v -texture coords (scalars)
  • $P - surface point (vector). Note: $P is sampled from the Pref geometry (if available)
  • $Nn - surface normal
  • $Vn - vector
  • $objectId - per-surface unique object Id, typically a small integer
  • $frame - current frame number

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