Colored balloons in $S^2 \times E$, focused by the positive curvature of the spherical factor
Raymarching in S2 x E, the product of the round 2-sphere with a real line. Distances in the S2 factor use sphDot (the standard inner product on the embedding 3-sphere). Colored balloons are placed in the space, demonstrating how the positive curvature of S2 focuses nearby geodesics.
Controls: WASD to rotate, arrow keys to translate.
