Swift Scenekit 对象拖动障碍

如何解决Swift Scenekit 对象拖动障碍

我正在学习 Scenekit 并在使用框架。我已将所有内容都设置为名为“jumpBall”的 scnnode，具有动态物理特性，并位于地板对象上。目前，“jumpBall”可以基于平移手势进行水平拖动。 “jumpBall”可以从世界位置“x = -3.5”拖动到“x = 3.5”。一旦球碰到这个障碍，它就会踢出平移手势功能，除非它被拖动到障碍的相反方向。然而，这些障碍并不总是有效，快速平移手势有时可以看到球穿过这些障碍。我不希望球被夹在这些阻力障碍之外。

@objc func handlePan(panGesture: UIPanGestureRecognizer) {
    guard let jumpBall = self.jumpBall else { return }
    guard let view = view as? SCNView else { return }
    let location = panGesture.location(in: self.view)
    let ballPositionX = jumpBall.worldPosition.x
    
    switch panGesture.state {
    case .began:
        guard let hitNodeResult = view.hitTest(location,options: nil).first else { return }
        panStartZ = CGFloat(view.projectPoint(lastPanLocation).z)
        lastPanLocation = hitNodeResult.worldCoordinates

    case .changed:
        //the '380' value represents the y value CGPoint of the floor
        let worldTouchPosition = view.unprojectPoint(SCNVector3(location.x,380,panStartZ!))
        
        //this represents the direction of the ball
        //a positive dragX means the ball is moving right
        //a negative dragX means the ball is moving left
        let dragX = (worldTouchPosition.x - lastPanLocation.x) * 1.1
        
        let movementVector = SCNVector3(dragX,worldTouchPosition.y - lastPanLocation.y,0)
        
        //break out if the ball is around the right wall and moving right
        if(ballPositionX > 3.2 && ballPositionX < 3.6) {
            if(dragX > 0) {
                break
            }
        }

        //break out if the ball is around the left wall and moving left
        if(ballPositionX < -3.2 && ballPositionX > -3.6) {
            if(dragX < 0) {
                break
            }
        }

        jumpBall.localTranslate(by: movementVector)
        self.lastPanLocation = worldTouchPosition

    case .ended:
        
        //brute force the ball back inside the barriers
        if(jumpBall.worldPosition.x > 3.5) {
            jumpBall.worldPosition.x = 3.5
        } else if(jumpBall.worldPosition.x < -3.5) {
            jumpBall.worldPosition.x = -3.5
        }
        
    default:
        break
    }
}