This is a CUDA port of evert, a C++ program that turns the sphere inside out. Written by Nathaniel Thurston and based on ideas of William Thurston, evert was used for the movie Outside In.

This fork comes with a Youtube video.

It tries to "simplify" the original implementation by keeping only first-order differential data.

evert-cuda.cu generates the geometry of the eversion (as an array of triangles) and renders it to a PPM image (via path tracing).

evert-cli.cu generates the geometry of the eversion (as an array of triangles) and prints it out to the console.

You can find out more about evert at the Geometry Center's website.