Ray is a project mainly written in C and C++, it's free.
A simple stereoscopic raytracer in C99.
A stereoscopic raytracer in C99. The only mode supported so far is cross-eyed 3D. To compile:
make
To run:
./ray
To see it in 3D, just cross your eyes, so that your left eye is looking at the right image, and your right eye is looking at the left image. Watch a youtube tutorial on cross-eyed 3D.