Bouncing Balls with Soundcolorsis a much enlarged version of:http://scratch.mit.edu/projects/Canthiar/7369by Canthiar You now have colors an sounds and many parameters to play with:Up / Down = -/+ GravityLeft / Right = -/+ Emitter SpeedB / A = -/+ more Balls1 = switch Edges2 = switch Turn Effect3 = switch Random4 = switch Drawing5 = switch SoundSpace = start Balls againDragDrop Collision ObjectsDragDrop BallsDragDrop EmitterTurn Emitter by pulling it's tipH = Help (english)G = Help (german)Chantiers original description:You can move the object emitter around with the mouse and change the direction by clicking on the pointed end.This is what I consider a production version since I've inlined a few things. I have a more academic version that is a little easier to read. The whole thing is also dumbed down a little to make the math a little easier.How it works:When a ball encounters a collision object it uses the [ point towards[ Collision ] ] command block and then uses sin and cos to calculate a colliion normal. That normal is used to calculate a resulting velocity perpendicular to the surface and velocity tangent to the surface. Friction and restitution are applied to make the ball bounce.
