In SceneKit, I had a problem on collision of two dynamic spheres, when the one strikes to another with fast speed, it was passing through inside of it. After i have reduced physicsWorld.timeStep value from 1/60 to 1/300, collision of Spheres becomes perfect. However in this moment, if sphere strikes to static wall, it started to slide along the wall (like sticky) instead of being reflected from wall. Ball started to lose so much energy after colliding to wall.

When timeStep was 1/60, ball was bouncing on the wall even in so low speeds, instead sticking to wall. What kind of parameters are affected in physicsBody of the wall or ball by the timeStep?

Wall Parameters;

let ballMass: CGFloat = 0.08
physicsWorld.timeStep = 1/300

let wallGeometry = SCNPlane(width: (maxX - minX), height: wallHeight)
wallGeometry.firstMaterial?.diffuse.contents = UIColor.red
wallGeometry.firstMaterial?.isDoubleSided = true
let shapeWallGeometry = SCNPhysicsShape(geometry: wallGeometry, options: nil) //su an lik bir ise yaramiyor

let wallNode = SCNNode(geometry: wallGeometry)

wallNode.position = SCNVector3( x: Float(xCenter), y: Float(minY-cushionHeight/2), z: Float(cushionHeight)/2 )

wallNode.physicsBody = SCNPhysicsBody(type: .static, shape: shapeWallGeometry)
wallNode.physicsBody?.restitution = 0.82
wallNode.physicsBody?.friction = 0.91

wallNode.physicsBody?.categoryBitMask = PhysicsCategory.WallType.rawValue | PhysicsCategory.GravityType.rawValue
wallNode.physicsBody?.collisionBitMask = PhysicsCategory.BallOneType.rawValue | PhysicsCategory.BallTwoType.rawValue | PhysicsCategory.BallThreeType.rawValue | PhysicsCategory.GravityType.rawValue
wallNode.physicsBody?.contactTestBitMask = PhysicsCategory.BallOneType.rawValue | PhysicsCategory.BallTwoType.rawValue | PhysicsCategory.BallThreeType.rawValue
self.rootNode.addChildNode(wallNode)

Your Answer

 
discard

By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.

Browse other questions tagged or ask your own question.