Some parts of ground disappear

[TacoDeBoss]

Sometimes while looking in a certain direction, parts of the ground will disappear

[ghost]

I don't think it's problem with our frustum culling function, but parameters passed into that function.

I tried to use: http://www.flipcode.com/archives/Harmless_Algorithms-Issue_03_Design_Patterns_And_3D_Gaming.shtml The same result.