In order to create the Tanglu logo I used POV-Ray, ImageMagick and GIMP.
You need these files:
heightfield.pov
The POV-Ray file that creates a fancy ray
spot.pov
The POV-Ray file that creates the border-softening mask
tanglu.pov
The POV-Ray file that create the triangle-shaped ray that we twist
tanglu.ini
The POV-Ray control file
tanglu.scm
The GIMP script that colorizes the swirl
tanglu.sh
The sh script that controls the whole process
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