pub fn sphere_grid_scenes<S: Scalar>() -> Vec<TestScene<S>>Expand description
Two unit-radius spheres: one fixed at the origin, the other swept across
every combination of [-0.5, 0, 0.5] along each axis, skipping the fully
coincident (0, 0, 0) case (26 scenes) — that configuration is a
degenerate coplanar (every point of one sphere’s surface touches the
other) rather than a transversal intersection, to be handled separately.