Collection of balls in the 3-sphere $S^3$, visible from multiple directions via great circle geodesics
Raymarching in the 3-sphere (S3), the positively curved Thurston geometry. Multiple balls are placed at various positions in S3. The spherical geometry means geodesics are great circles, and objects behind the viewer can be seen by light that has traveled more than halfway around S3.
Controls: WASD to rotate, arrow keys to translate.
