Reflections on a Curved Surface

Just move the mouse inside the box.

This is the core of the collision handler I wrote for my Gravitation and Collision demos. This calculates an intersection between X=B and R²=X²+Y² at Y=sqrt(R²-B²), then uses the point (B,sqrt(R²-B²)) to create the angle 2*arctangent(Y/X)-90. The other scripts use the velocity direction instead of 90 degrees.

Modified:

Original: 28.06.09