Surface Properties Functions

• SurfFlatNormal
  Calculates the flat surface normals.
• SurfSmoothNormal
  Calculates the smooth surface normals.
• HitPoint3DEpsSO
  Calculates coordinates of the hit points for a block of rays from the single origin.
• HitPoint3DEpsMO
  Calculates coordinates of the hit points for a block of rays from the multiple origins.

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