Re: which is the solid modeling kernel based on csg

Yogesh,

CSG is a construction methodology, not kernal level mathematical
representation.

Some very early 3D CAD systems (pre 1985) used CSG construction exclusively.
The last one I had any experience with was IDEAS V6i (pre master series).
Even then, 1987, the models were represented by NURBS faces and boundary
curves. I seem to remember a German program, same time frame, that claimed
to represent solids without surface information. I don't remember the name,
but I believe they were affiliated with H.P.


Regards

Mark




"yogesh" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> hi all!!
>
> which is the solid modeling kernel which uses csg algorithms??
>
> both parasoid and acis are based on b-rep...
> is there any such modeler availabe which is based on csg???
>
> if not ( that is my sure speculation) then can we say that csg
> representation is obsolute..
> i posted one earlier message regarding csg and brep and someone told
> me that in autocad we can build the object using csg
> operations(union,add,and subract etc..).but autocad is based on acis
> kernel which uses brep representation..
> now i am more confused..
> so how will one differentiate between building a model using csg
> techniques and storing them in brep...
>
> regds,
> yogesh joshi