   Polygons aren't being filled mid-range
  The title says it all.  In my program I have a rather large draw distance (8192 units), and triangles in the midrange aren''t being filled all the way.  It looks like there''s a big rip in the terrain that gradually disappears as you get closer.  Could it have to do with depth testing not working at that range because the Z increment is too large?  (I hope I used the right terminology).  If so, how do I change this? 
  What are you gluPerspective settings? With such a far far plane i''d suggest you use at least a 1.0 far near plane (maybe you''ll need even more). Could you post a screenshot or something? ;  I took your advice and moved the draw distance forward to 6144 and it seems to work ok, so problem solved ^_^.  Hah yeah I had the near-plane distance at 0.1F because my skybox is only 0.5F from each side of the camera (don''t ask).   ;  Hehehe, why ? 