Specifies the field of view angle, in degrees, in the y direction.
Specifies the aspect ratio that determines the field of view in the x direction. The aspect ratio is the ratio of x (width) to y (height).
Specifies the distance from the viewer to the near clipping plane (always positive).
Specifies the distance from the viewer to the far clipping plane (always positive).
4x4 perspective projection matrix (see Mat4.perspective for the Mat4 variant)
creates a perspective projection matrix