Le_Forgeron <lef### [at] freefr> wrote:

> Now, If I could only understood the "inward tilted" thing applied to a
> torus...

actually the inward/outward is superfluous (depends only if you look at the
torus from top or bottom).

here is a code snippet for a the tilted torus...
camera {location <0, 36, -48> look_at <0, 0, 0>}

#declare myTiltedInwardQuartTorus =
intersection {
  torus {24, 0.4 sturm on scale <1, 2, 1> matrix < 1,0,0,  1,1,1,   0,0,1,
0,0,0>}
  box {<-25, -1, -25> <0, 1, 0>}
}

// inward tilted torus
union {
  object {myTiltedInwardQuartTorus}
  object {myTiltedInwardQuartTorus rotate <0,  90, 0>}
  object {myTiltedInwardQuartTorus rotate <0, 180, 0>}
  object {myTiltedInwardQuartTorus rotate <0, 270, 0>}
  texture {pigment {color rgb<0.8, 0.8, 0.2>} finish {ambient 0.2 phong 1}}
}

Regards, Peter.

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