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hi marabou,
hey! thats one i can answer! difference is a constructive
solid geometry option, and that only works with "primitive"
shapes, such as cylinders, boxes, spheres, etc. all of those
shapes except the donut (toroid) are listed in the scene
language help document in section 2.2.
good luck, miker
"marabou" <not### [at] available yet> wrote in message
news:3bfbf8ed@news.povray.org...
>
> hello,
> i made a shape with bicubic_patch and failed as i tried to difference it
> from a box:
>
> difference{
> box{<0,0,0>,<1,1,1> pigment{color Green}}
> object{
> a_bicubic_object
> }
> }//difference
>
> the result was an empty scene.
> is there any way to come by this problem?
>
>
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