This scene, which has a far away camera, creates artifacts in the torus:

// The /100 and *100 things move the camera away, closer to orthographic.
// Remove them and the problem disappears.
// Change them to 1000 and you'll notice a very strange pattern.
camera {
 right 1.3333*x/2  /100
 up y/2     /100

 location -15*z  *100
 look_at z

 // switching to the equivalent orthographic camera doesn't solve the
problem;
 // the farther away the camera is, the worse the artifacts get.
 /*
 orthographic
 location -z*1000
 right 1.3333*x*7.5
 up y*7.5
 look_at 0
 */
}

light_source {
 <.5,.7,-1>*9999
 rgb 1
}

torus {
 1,.5
 rotate 90*x
 pigment {rgb 1}
}

Render the scene at 320 x 240 with or without AA.

Beta 6, Win 98, PIII 900, 256 MB RAM

- Slime
[ http://www.slimeland.com/ ]
[ http://www.slimeland.com/images/ ]

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