- gl
- a GL10 interface
- fovy
- specifies the field of view angle, in degrees, in the Y direction.
- aspect
- specifies the aspect ration that determins the field of view in the x direction. The aspect ratio is the ratio of x (width) to y (height).
- zNear
- specifies the distance from the viewer to the near clipping plane (always positive).
- zFar
- specifies the distance from the viewer to the far clipping plane (always positive).
Set up a perspective projection matrix