Hello,

Suppose I set an orthog projection :

GL.Ortho(0, 800, 800, 0, -1, 100);

I can then read back the projection matrix using:

GL.GetFloat(GetPName.ProjectionMatrix,…);

Which gives me the matrix:

(5.086263E-06, 0, 0, 0)

(0, 6.510417E-06, 0, 0)

(0, 0, 0.0003921184, 0)

(-1.043701, 0.9973958, -0.9607882, 1)

My question is, how do I get back to my “left, right, top, bottom” parameters from this matrix?

Many thanks,

James L.