Hi, all
   I am now reading a sample pov file ( \\ POV-Ray for Windows v3.5 \\
scenes \\ advanced \\ sunsethf.pov ). The following is a piece of code:
height_field {
   png "fract003.png"
   water_level 0.4

   pigment {
      image_map { png "fract003.png" }
      quick_color White
      rotate 90*x
      scale <320.0, 1.0, 200.0>
      translate <0.0, 0.0, -1.0>
   }

   scale <320, 256, 200>
   scale <2.0, 0.5, 2.0>
   translate <-160.0, -63.5, -100.0>
   rotate 10*y
   translate <-80.0, 0.0, -30.0>
}

I do not know what "rotate 90*x" means in pigment definition. I tried to
find in the help pages, but I did not find it. Could someone explain it to
me? Thanks

Best Regards
Wu Yang

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