Question

I currently have a method that checks to see if I go out of bounds either from either the top/bottom/sides. The object itself is a ball, and I have a question about getting the ball bouncing off the edges correctly? How do I go about this?

// The behavior is not quite what I want.

if ( InsideOfBounds )
{
     Vector3 mCenter = Ball.getCenter();
     Vector3 normalizeV = tempCenter;
     normalizeV.Normalize();
     mHeroBall.setVelocity(-testSpeed * normalizeV);
}

Answer 1

I can provide you with an example from a Breakout-clone written in XNA:

Ball.cs

Basically, you flip the right component of velocity to make a ‘perfect’ rebound. If you want, you can add friction or elasticity by multiplying by a coefficient like 0.95 or 1.1 so your ball speed change.