[Gul-developers] [Fwd: About the project]

[Norbert I. <nor...@he...>]

Norbert Irmer wrote:
> 
> Javier Martin Garcia wrote:
> >
> > I'd like to know if your project includes support for
> > solids, in particular i am interested in boolean operations
> > with solids.
> >
> 

No, currently not.
 
Perhaps some day I will be able to calculate trimmed
nurbs surfaces by intersection.
 
I did some steps in this direction. Like calculating a linear
approximation of the intersection curve of nurbs surfaces, and
doing boolean operations with 2D polygons (for combining the regions
formed by the intersection curve with already existing
trim contours).
 
But solid operations are more difficult, mainly because
you need a reliable inside/outside test for them.
(And there may be gaps between adjacent nurbs surfaces
if you store solids only as groups of trimmed
surfaces).
 
I think the best solution to avoid the gap problem is to
work with a fixed accuracy, but to store also the solids
as a CSG tree.
Then, if the user later requires a higher or lower accuracy,
the whole calculation could be repeated.
 
Best regards,
Norbert