Rotating Gap
The wall is a circle with a rotating angular gap.
Browser physics toy
Bouncy Balls
A small browser-based physics toy. Balls bounce inside a rotating circular wall until they find the moving gap and escape.
0/20 live balls
Vector Reflection
Collisions bounce by reflecting velocity around the wall normal.
Escape Test
Escape compares the ball boundary angle with the current gap angle.
Canvas Port
The simulation runs directly in the browser with web-native Canvas.