Can't limit the camera pitch angle between [-90º, 90º] in OpenGL using vectors?

Problem 1 : The code belew "// Makes sure all vectors are perpendicular all the time" makes sure that your UP camera vector is actually up (with respect to WORLD_SKY_VECTOR). So.

You can't take the cross product of two parallel vectors. I think that's where it's failing, i.e. When accumPitchAngle is ±90°.

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