Probably same result as Ofnuts plugin and more work involved. One of gmics filters Map - Triangular Projection. http://www.gmic.eu
You need to double the canvas height - apply filter - crop back to original size.
Offered just as an alternative.
40 second example https://i.imgur.com/x5Yaavm.mp4
You need to double the canvas height - apply filter - crop back to original size.
Offered just as an alternative.
40 second example https://i.imgur.com/x5Yaavm.mp4