MR wrote:

> 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

miker, i fear you are right. and this confirms my results. yes. hm. smack. 
but how to come by this problem? is there another possibility?
thanks for the hint!

> 
> 
> "marabou" <not### [at] availableyet> 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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