"SharkD" wrote:
> OK, I think I accomplished what I set out to do.
>
> Compare the isometric image of a cube:
> http://img134.imageshack.us/img134/6726/cubeisometricot0.png
> with the oblique image of the same cube:
> http://img141.imageshack.us/img141/639/cubeobliquedl4.png

If you just want to create the effect of that second image, then the below 
code works perfectly and is far simpler than the math you were using:

#declare CameraDistance = 20;
#declare CameraArea = 5/2;
#declare CameraSkewed = 0.7;
#declare AspectRatio = image_width/image_height;

camera {
   orthographic
   location <-CameraSkewed,1,-CameraSkewed>*CameraDistance
   direction <CameraSkewed,-1,CameraSkewed>
   up (x+z)*CameraArea
   right (x-z)*CameraArea*AspectRatio
}

light_source {
   <0,0,-100> color rgb 1
   rotate <60,30,0>
   parallel
   shadowless
}

box {-0.5,0.5 pigment {rgb 1}}

#declare Arrow = union {cylinder {-x, x, 0.02} cone {x, 0.1, 1.2*x, 0}}
object {Arrow pigment {red 1}}
object {Arrow rotate 90*z pigment {green 1}}
object {Arrow rotate -90*y pigment {blue 1}}

plane {y, 0
   pigment {
      boxed translate x+z warp {repeat x*2} warp {repeat z*2}
      scale 0.05
      color_map {[0.1, rgb 0.3][0.1, transmit 1]}
   }
}


Rune
-- 
http://runevision.com

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