what values in the projection matrix define the far clipping plane? If I had a 4x4 matrix like this: |m0 m1 m2 m3| |m4 m5 m6 m7| |m8 m9 m10 m11| |m12 m13 m14 m15| Any help will be greatly appreciated!

Look in Chapter 2 of the OpenGL specs (Coordinate Transforms) under the glFrustum function. It is probably in the Red Book too but I don''t have that to hand.

The actual projection matrix is slightly more complex but:

m10 = - (f+n) / (f-n)
m11 = - (2*f*n) / (f-n)

Where f is the far plane value and n is the near plane value.

p.s.

You matrix layout is actually transposed for OpenGL.

Alright, thanks JuNC!