50 spheres (configurable via --spheres N) bounce around inside an
80-unit cubic bounding box, reflecting off any of its 6 walls. Sphere
count is adjustable live with +/- (never below 1). An optional,
off-by-default all-pairs sphere/sphere check can be toggled on top of
the wall collisions -- ported faithfully from
NGL9Demos/Collisions/BoundingBox, including its slightly odd pairwise
rule where a colliding pair's response is applied per comparison rather
than per pair: each sphere gets a turn as the "current" one in the
O(n^2) sweep, so within a single tick a colliding pair typically ends up
reversing both directions anyway.
space : pause/resume, s : toggle sphere/sphere checking (off by default)
r : reset all spheres, +/- : add/remove a sphere (minimum 1)
f : fullscreen, n : windowed
Left-drag : orbit, Right-drag : pan, Wheel : zoom
main_webgpu.py reproduces the same default 50-sphere setup and
controls independently (minus f/n fullscreen, which has no WebGPU
QWidget equivalent here). The sphere count is capped at 200 -- a
fixed-size GPU buffer pool needs a ceiling, unlike the C++'s unbounded
array; the default behaviour (50 spheres, add/remove by 1) is unaffected.