Hello, Can anyone explain or point me to a place that explains methods to check if the user can see something, how would you do that for example with terrain, how would you check to see if a user can see a patch of terrain and if he doesnt, there is no point to draw it.... Thanks in advance

Google->Frustum culling

(if you can''t find anything sensible at first glance, type in Mark Morley - you''ll know what I mean)