POV-Ray : Documentation : 2.4.3 Infinite Solid Primitives
  POV-Ray 3.6 Documentation Online View Triangle and Smooth Triangle Plane

2.4.3 Infinite Solid Primitives

There are five polynomial primitive shapes that are possibly infinite and do not respond to automatic bounding. They are plane, cubic, poly, quadric and quartic. They do have a well defined inside and may be used in CSG and inside a clipped_by statement. As with all shapes they can be translated, rotated and scaled. Triangle and Smooth Triangle Plane

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