I have been working on one of my 3-d visualization programs where I am using quads to create an architectural scene. Out of the blue(it seems) I run my code and all of the quads seem to be showing black outlines (and diagonals from their respective triangles). Not only do these unwanted diagonals show up, but it seems as if there is no hardware acceleration and is very slow. I am mostly puzzeled by the fact that when I restart the computer the code will run fine for a while (3-5 executes) then it will revert back to the above state. I tryed running the code on another machine and had the same problem (this time there wasn’t a fix after restarting).
Any help on this would be great.