Symmetric view frustum (vertical and horizontal)
- Pinhole camera (no lens)
- Distance to projection plane doesn't matter, can even be negative

Asymmetric view frustum
- Generally poor support in application software
- Projection plane always perpendicular to the view direction
- Object projection differences
- Image

- Similar to looking through a window at an angle
- Object visibility

- Can also apply vertically


3 wall example
- Sweet spot for undistorted visuals
- Head tracking
- Examples
- Image

- 3 asymmetric frustums
- Not the same as rotations
- View direction always perpendicular to projection plane (may not even intersect it)


Asymmetric fisheye projection
- Example
- Image



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