3D transforms simply explained - m34 is key
This is mostly a note for an iOS development environment. M_PI is half the diameter, so M_PI * 2 (6.28) is full circle (in radians). Zero would be no rotation, which would also yield the same effect as M_PI * 2, because it is rotating twice. M_PI would yield a half rotation. Negative values (for the m34 or radians) rotate towards 6.28 or zero (orthographic) counter-clock-wise. If both values are negative (or positive), then it will rotate clock-wise. Changing m34 adds to the effect of (or enhances) the rotations. The transform.m34 value will always be a percentage of 1.0 (flat). Hence dividing 1 by N (1.0f / 1200). 1.f represents "full perspective", but looks huge to the user because its the full size. Closer to 1, the flatter the look, but the larger the view. Think of a train track. 1 would be like viewing the tracks from the top, flat. But, as you reduce/divide 1 by something, you change one of the ends of the track to be more triangular. Negative or positive focuse