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The angular fisheye projects the full environment around the viewpoint on a circular image plane. This type of view may be useful for visibility checks, and to evaluate light impact at a given point in space.
![[Angular Fisheye Graphic]](images/viewedit_a.gif)
With an angular fisheye projection, the distance of a point in the image from the image center will always be determined by the angle of the associated ray from the view direction. This maps every direction in space onto a circle. However, areas behind the viewer will be very strongly distorted in the image. As the extreme, the backwards direction is mapped to the peripheral circle of the image, instead of to a single point.
The maximum horizontal and vertical opening angles for this projection are 360 degrees. The virtual diagonal opening angle of the full image may get greater, while of course the part of it that actually displays any image data is still limited to 360 degrees. The concept of focal length doesn't make sense for an angular fisheye. The area outside of the actual circular image is rendered black by Radiance.
The diagram below illustrates the mapping of all angles onto the image plane with an angular projection.
![[Angular Fisheye Diagram]](images/vta_ang.gif)
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