Planar fan of light rays bending in a variable-index-of-refraction medium that is mathematically identical to a charged black hole, this time in a sphere.
Visualizes a spray of null geodesics passing near a single extremally charged black hole in a Majumdar-Papapetrou spacetime. Each ray is numerically integrated and rendered as a tube geometry, with the color indicating whether it escapes to infinity or falls into the event horizon. Slider controls adjust the beam position, angle, ray count, and angular spread.
Controls: Click and drag to orbit, scroll to zoom.
