pioneerspacesim/pioneer — pull request #971 by Luomu (2012-02-14 23:26:54+00:00)
Title: Change perspective matrix calculation

Fix perspective matrix calculation so the result matches gluPerspective, or the math here:
http://www.opengl.org/resources/faq/technical/transformations.htm
http://www.songho.ca/opengl/gl_transform.html

Also reduce the default FOV so it matches the original setting (83)