Hello,

I think that I have come across a bug in POV-Ray. Try to render the
following scene:

background { color rgb 1 }

camera {
  sky z
  location <1757,792,798>+<0,800,0>
  look_at <1757,792,798>
}

light_source { <-50,800,0>+<1757,792,798> color rgb 1.5 }

bicubic_patch {
  type 1 flatness 0.0 u_steps 4 v_steps 4
 
<1277.46,645.096,730.238><1273.35,640.857,678.616><1271.38,636.003,630.537><1271.54,630.534,585.999>
 
<1275.19,678.859,731.733><1315.94,664.298,681.323><1317.52,659.516,632.745><1279.95,664.515,585.999>
 
<1323.73,702.723,730.807><1358.35,687.334,681.949><1355.24,682.46,633.679><1314.41,688.101,585.999>
 
<1423.09,716.687,727.459><1400.58,709.966,680.493><1384.54,704.834,633.34><1374.95,701.292,586>
  pigment{color rgb 1}
}

If you replace "type 1" by "type 0". The patch will look quite different.
In my opinion the surface normal is not correct. Can some one confirm that
this is a bug and check whether it is corrected in version 3.1b? (Since
I use Unix I can not do it.) I will then email a bug report to Chris.

Thomas

-- 
Tho### [at] uni-konstanzde
http://www.fmi.uni-konstanz.de/~willhalm/
Tschieses lavs ju

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