Hello,
I am working on a fisheye distortion, and am having an issue with the mapping. I would like to draw a disk similar to what is show here(middle of the page, ctrl+f tess):
http://local.wasp.uwa.edu.au/~pbourke/projection/dometexture/
http://local.wasp.uwa.edu.au/~pbourke/projection/dometexture/texturecoord.jpg
Any ideas on how this could be done?