CGAL users discussion list

[shebbycat <>]

Hi everyone,

I'm new to CGAL and quite grateful for its existence!  I've built an
application that iteratively clips a 3D Nef Polyhedra with a plane, for a
specific application.  For example, I define a clipping plane which
intersects a polyhedron (with its center at 0,0,0) and clip, rotate by some
degrees, clip again, and so on.  When its done I convert it back to a 3D
polyhedron and render it in OpenGL.

My first question is that this process is really slow.. like taking a couple
seconds per clip.  My kernel is:
typedef CGAL::Extended_cartesian< CGAL::Gmpq> K2;

My second question is that sometimes after my clip process Ive inadvertently
clipped the origin side of the polyhedron instead of the "outer" side of the
intersection.  Id like to always preserve the portion of the poly that
contains the origin.  Ive tried grabbing the volume handle for the origin
point, but not sure how to use it properly.

Is there anything I can do to speed the clipping up, and whats the best way
to check that my intersection will preserve the correct side of the poly?

Thanks!



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