Hi!
Thank you for your reply.
I can have the viewpoint window rectangular or squared, (that we can control with the fovH, or fovV, or h2vRatio).
I think I was not very clear with my problem.
If the "frame size"/"sensor size" is fixed in Vizard, than the focal length is easy to estimate/set with the fov.
http://en.wikipedia.org/wiki/Angle_o..._angle_of_view
For instance, it seems that openGL uses the tipical frame size:24mm x 36mm,
http://www.opengl.org/discussion_boa...&Number=193124
is Vizard also using this values?
Thank you in advance,