🔒 Locked

A geometry viewer

Started by gooky Oct 13, 2004 at 6:06 PM 0 replies 500+ views

Original Post

Oct 13, 2004 at 6:06 PM

I need to make a viewer - a simplified version of the viewpoint media viewer. To start with I restricted the object count in the scene to 1. My goal was to be able to spin around the object, zoom and pan. I would like to not backfacecull any faces, and it would be nice if I could antialias the edges (edges between object and empty space) I started out using directX to show the object. It worked fine with very little code as long as I showed with backfaceculling. When I turned on that, it started to go extremely slow. The reason was ofcause the amount of faces in the object - around 100000. Now to my question... What can I do about this... I need to somehow QUICKLY filter away triangles that can not be seen anyway. There must be some algorithms for that...

WarAmp

Oct 14, 2004 at 12:28 AM

backface culling does that...culls away triangles that point away from the camera...kind of ideal for what you want, isn't it?

If, for whatever reason, you cannot backface cull, I recommend using some sort of spatial partitioning (an octree for this case, perhaps?) and then do occlusion culling against the octtree. Google is your friend here.

Occlusion culling is not a trivial task to do in the general case. Hardware extensions may help you. (google for occlusion_query)

Topic Locked

This topic has been locked by a moderator. New replies are not allowed.