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This one has an astronomical simulation purpose, but I did not get much of it, so I will just copy-paste the accompanying text :
"It simulates gravitational lensing by a point mass in the usual weak-field, small-angle, and thin-screen approximation. Built-in sliders can be used to adjust the position of the lens within an image, the Einstein radius and the RGB color of the Einstein ring and the undefined area around the lens, where the filter tries to map the region outside the image's edges."
In the end, you come up with a really nice warp filter. |
