SpriteKit physics in Swift - Ball slides against wall instead of reflecting

Question

I have been creating my own very simple test game based on Breakout while learning SpriteKit (using iOS Games by Tutorials by Ray Wenderlich et al.) to see if I can apply co

Answer 1

This problem only seems to occur when the velocity is small in either direction. However to reduce the effect it is possible to decrease the speed of the physicsWorld, e.g.,

physicsWorld.speed = 0.1

and then increase the velocity of the physicsBody, e.g.,

let targetVector = (moveToward - ball.position).normalized() * 300.0 * 10
ball.physicsBody!.velocity = CGVector(point: targetVector)