Hi,
I’ve got a question about some parameters in the projectionmatrix.
A typical call to glFrustrum gives you a matrix like this :
|E 0 A 0|
|0 F B 0|
|0 0 C D|
|0 0 1 0|
My question is about A and B. In most cases these will be 0 since left,right and top,bottom are the same except from the minus sign.
But i work with a matrix i calculated from a camera callibration. And in this matrix those values aren’t zero.
I know these values stand for the optical centre, but what is their actual effect on the view i get? When i vary them manually my camera seems to move but the perspective doesn’t change the way you would expect it to.
Any help would be much appreciated
jo