Shaders Support Functions

• Dot
  Calculates the dot product of two vectors.
• DotChangeNorm
  Calculates the dot product of two vectors and changes the sign of the surface normal.
• Mul
  Multiplies accumulator and source vectors.
• AddMulMul
  Multiplies two source vectors and adds product to the accumulator.
• Divi
  Divides two vectors.
• DistAttenuationSO
  Calculates the distance between the source point and intersection points.

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