This is a ray tracer in Schwarzschild spacetime. Rays are sent from the camera to the scene, and at each time t, the position and velocity for t+1 is calculated following the orbit equation of said spacetime.
Results are acceptable. However, the geometry of spacetime only affects camera rays, which means that light is wrong. I will work on fixing this with photon mapping, which should work with a very similar approach.
The latest version of this repository produces images like:
