Projections

Perspective

Most Common. The default perspective camera which simulates the classic pinhole camera.

Orthographic

Uses parallel camera rays to create an image of the scene. The size of the image is determined by the lengths of the right and up vectors.

Fisheye

A spherical projection. The viewing angle is specified by the angle keyword. An angle of 180 degrees creates the "standard" fisheye. You should get a circular image.