Question

在SceneKit中，我遇到了两个动态球体碰撞的问题，当一个动态球体快速碰撞到另一个时，它正在通过它的内部。当我将physicsWorld.timeStep的值从1/60增加到1/300之后，Spheres的碰撞就变得完美了。但是，在此刻，如果球体撞击到静态墙，则它开始沿墙滑动（像粘性的一样），而不是从墙反射出来。撞到墙后，球开始失去那么多能量。

当timeStep为1/60时，即使在如此低的速度下，球仍会在墙壁上弹跳，而不是粘在墙壁上。物理参数受时间步长影响的是墙或球体的什么参数？

墙壁参数；

    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)

timeStep对SceneKit中PhysicsBodies的影响

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