I have very complex objext with 500 000 number of faces, and i need rotate, move and scale it. It is intolerable slow. DO anyone know haw to simplify it during oparation to about 5000 faces? Thanx

Use LOD''s with your model or work on a culling / hidden surface removal routine.

DC

Start with :
http://research.microsoft.com/~hoppe/

It can be a little tough to get through, but at least try to get a high-level view of what''s going on, even if you can''t get the specifics.

From there http://www.cbloom.com/3d/techdocs/vipm.txt and
http://www.cbloom.com/3d/techdocs/vipm_topics.txt

Those should be understandable, but they do expect that you''ve at least browsed hoppe''s work.