Incidentally, I found another bizarre texture behavior involving triangles:
Render this sample with the scale commented out and then again with it in.
Anyone understand why this happens?

camera{
  perspective
  location <0,1,-10>
}
light_source{
  <5,10,-10>
  color rgb<1,1,1>
}
triangle{
  <-1,-1,0> <1,-1,0> <0,1,0>
  texture{pigment{color rgb<1,0,0>}}
  interior_texture{pigment{color rgb<0,1,0>}}
  rotate <0,180,0>
  //scale  <1,1,1>
}

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