[PD] 3d boolean in gem

[james tittle]

hi,

On Jul 13, 2006, at 5:33 AM, yukio wrote:

> hi , in some tradicional 3d software like 3d studio max and cinema4d
> theres a fuction called boolean that enable for example  substract  
> areas
> from a 3d object using another ..... for example if you have 2  
> spheres ,
> you can use one to substract an area of the second one, you can  
> also add
> 2 3d object or visualize just the intersection of both objects.....
> my question is .. is it possible to make something like this in Gem  
> with
> geos?
> for example substracting an  area of a geo with a second one?

...what your looking for is called "constructive solid geometry" (1),  
and it's not natively supported in GEM:  in general, GEM's strengths  
are not as a traditional "modeler"...GEM allows fairly low-level  
access to 3D OpenGL operations which could be used to create your own  
CSG patches, but you'd have to do the math for the primitives and  
intersecting in pd, and then use GEM to upload the vertices and view...

james