Fisheye lenses can capture ultra-wide-angle images that are circularly distorted. In some cases, the distortion can be aesthetically desirable.
How to use
Please use this link for information on how to turn a camera into a fisheye camera.
Parameters
The horizontal and vertical scales which allow 'zooming into' the distorted image. This can help get rid of the black area surrounding the image.
To demonstrate the effect of the fisheye camera, we'll use the following reference scene. The camera is pointing towards the green sphere. The red sphere is 90 degrees to the left of the camera and the blue sphere is 90 degrees to the right. The black sphere is exactly behind the camera.
Here we demonstrate the fisheye camera with an Angle of View / FOV (Field Of View) of 180 degrees. This captures the entire front hemisphere of the camera.
If the surrounding black areas are undesirable, the user can use the horizontal/vertical scales to zoom into the image and get rid of them. In this case, we used a scale of 1.41 (the square root of two) which is the scale needed to fit the image exactly into the circle.
