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OpenGL Whats this supposed to look like? OpenGL jaggiesQ.

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Im learning OpenGL and I have the book "The OpenGL Superbible v2" and im having problems with one of the tutorial programs. Basically its supposed to create a water effect by intersecting a semi-transparent plane across a landscape at a certain Y value. Obviously this causes alot of polygon to intersect. The problem is that all I see is some really funked up jagged edges where the water should be. Is this normal? I assume this isnt what it looks like for everone. My card is a TNT2 and I thought it could render simple stuff like this. If anybody has any clues to whats going on let me know. Heres the program http://www.members.home.com/x-frog/terrain6.zip Please help me solve this crappy jaggies mystery.

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Well, I sort of solved the problem.
For some reason the tutorial .exe that came on the cd has the jaggies, but when I compiled the source myself (never thought that would make a difference) they arent there....
oh well...dont bother responding to this I guess.....
thanks anyways

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there was a simular post in the nehe forum a couple of days ago it concerns lack for z buffer precision

http://members.xoom.com/myBollux

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