Bouncing ball slowing down over time
- by user46610
I use the unreal engine 4 to bounce a ball off of walls in a 2D space, but over time the ball gets slower and slower.
Movement happens in the tick function of the ball
FVector location = GetActorLocation();
location.X += this->Velocity.X * DeltaSeconds;
location.Y += this->Velocity.Y * DeltaSeconds;
SetActorLocation(location, true);
When a wall gets hit I get a Hit Event with the normal of the collision.
This is how I calculate the new velocity of the ball:
FVector2D V = this->Velocity;
FVector2D N = FVector2D(HitNormal.X, HitNormal.Y);
FVector2D newVelocity = -2 * (V.X * N.X + V.Y * N.Y) * N + V;
this->Velocity = newVelocity;
Over time, the more the ball bounced around, the velocity gets smaller and smaller.
How do I prevent speed loss when bouncing off walls like that? It's supposed to be a perfect bounce without friction or anything.
