Null geodesics near a black hole in full spacetime and spatial views.
Renders null geodesics near a single extremally charged black hole, displaying both the full spacetime trajectories (with time as a spatial axis) and their purely spatial projections. The two views are shown side by side, illustrating how the time component of a null geodesic changes as the ray grazes the event horizon. Controls adjust mass, beam direction, spread, ray count, thickness, and integration length.
Controls: Click and drag to orbit, scroll to zoom.
