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Crossing polygons

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I have a problem with crossing polygons. My OpenGL doesn''t show it right. They looks like broken. Why is it happened? How may I resolve this problem?

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Not quite sure what he means either, but I have a similar (possibly same?) problem also.

Say I have two cubes which intersect one-another...
Where they meet, it err (hard to explain) sometimes draws strange artifacts where they meet.

Depthtesting is on, alpha off... Just loox screwy

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If depth testing is enabled and set up correctly, then it''s probably caused by insufficient precision in the depth buffer. Usually that happens because of a near Z plane which is too close to 0.

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