GR-exact Schwarzschild null-geodesic ray tracer — gravitationally lensed accretion-disk renders
Lensed thin accretion disk, 80° inclination — far side bent over the shadowLensed accretion disk, 20° inclinationKerr disk a=0.9, 78° — relativistic Doppler beaming asymmetryKerr shadow a=0.99, 80°Shadow and photon ring