POV-Ray Insert Menu
mady by Christoph Hormann
http://www.imagico.de/

wood

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// pattern for use in texture/pigment/normal/density
// create a concentric cylindrical wood-like texture,
// grain along Z axis
  wood
  //wood 0.5         // for use with normal{} (0...1 or more)
  //turbulence 0.1   // should have some!