Hey all, Hope the title explain it a bit but imagine we have a BSP render, but right now it renders the inside world( e.g. game space ) but also the samepolygons that have their normals inverted( pointing towards the void ) but should these really be renderen, the quake engine don''t render these( water is an exception where both sides need to be rendered ) and how can i dispose ''em? cheers, Gorgorath

Assuming you've already excluded tris not in the view frustrum, and that you've rotated them all according to the camera's angles etc. etc.

let n = the normal of the tri to check

if( n.z > cos( gfFov / 2.0f ) )
dont_render();
else
render();

edit:
That method won't exclude all tris not visible, but it's definately faster than something like this:

let p = the center of the tri
n = the normal

if( n.Dot( p.Normalize() > some_number ) //somenumber ~= 0.1
dont_render();
else
render();

Which should get all non-visible tris away. Do keep in mind that very large tris might or might not be visible.. I just whipped this up really quick.

[edited by - Tjoppen on January 14, 2003 11:40:16 AM]