ARKit：球沒有穿過SCNTorus洞

我在ARKit上遇到問題，我需要幫助。我正在做一個小演示，我在場景中放置一個簡單的SCNTorus幾何體，並且試圖將一個小球（SCNSphere）扔進圓環孔。問題在於球在中間彈跳而不是通過。沒有爲環面的代碼：ARKit：球沒有穿過SCNTorus洞

 let ring = SCNTorus(ringRadius: 0.4, pipeRadius: 0.1) 
    ring.ringSegmentCount = 100 

    let ringMaterial = SCNMaterial() 
    ringMaterial.diffuse.contents = UIImage(named: "art.scnassets/Ball/BeachBallColor.jpg") 

    ring.materials = [ringMaterial] 

    let ringNode = SCNNode() 
    ringNode.position = SCNVector3(
     x: location.worldTransform.columns.3.x, 
     y:location.worldTransform.columns.3.y + 0.8, 
     z: location.worldTransform.columns.3.z 
    ) 

    ringNode.geometry = ring 

    let body = SCNPhysicsBody(type: SCNPhysicsBodyType.kinematic, 
           shape: nil) 
    body.categoryBitMask = CollisionTypes.wall.rawValue 
    body.collisionBitMask = CollisionTypes.beachball.rawValue 
    // body.contactTestBitMask = CollisionTypes.beachball.rawValue 
    body.isAffectedByGravity = false 
    body.mass = 0.5 

    ringNode.physicsBody = body 

    sceneView.scene.rootNode.addChildNode(ringNode)

而對於球：

let node = SCNNode(geometry: sphere!) 
    node.renderingOrder = 10 

    let body = SCNPhysicsBody(type: SCNPhysicsBodyType.dynamic,shape: nil) 
    body.categoryBitMask = CollisionTypes.beachball.rawValue 
    body.collisionBitMask = CollisionTypes.solid.rawValue|CollisionTypes.wall.rawValue|CollisionTypes.beachball.rawValue 
    // body.contactTestBitMask = CollisionTypes.fireball.rawValue|CollisionTypes.wall.rawValue 
    body.isAffectedByGravity = true 
    body.mass = 0.5 
    body.restitution = 0.75 
    body.damping = 0.1 
    body.friction = 0.8 

    node.physicsBody = body

來源

2017-10-17 El Barji Ayoub

可能的重複：https：//stackoverflow.com/q/27391763/957768 – rickster

使用創建physicsbody（體型kinametic和形狀無）以簡化的「凸結果的代碼船體「幾何形狀的表示。簡而言之，您看到的幾何體是圓環面，但用於碰撞檢測的幾何體不是。

的（OBJ C）這行代碼實際上是從蘋果的示例代碼項目之一：

_torus.physicsBody = [SCNPhysicsBody bodyWithType:SCNPhysicsBodyTypeStatic shape:[SCNPhysicsShape shapeWithGeometry:_torus.geometry options: @{SCNPhysicsShapeTypeKey : SCNPhysicsShapeTypeConcavePolyhedron} ] ];

換句話說，你需要根據幾何自己創建一個靜態類型的身體和形狀使用SCNPhysicsShapeTypeConcavePolyhedron鍵值（僅適用於靜態物體）最終以環體幾何形狀的更精確表示作爲物理體。

有關詳細信息，請參閱：https://developer.apple.com/documentation/scenekit/scnphysicsshape

來源

2017-10-18 15:35:11 Xartec

謝謝！這行得通！有代碼：

let ring = SCNTorus(ringRadius: 0.4, pipeRadius: 0.1) 
    ringNode.geometry = ring 

    let shapeOptions = [ SCNPhysicsShape.Option.type : SCNPhysicsShape.ShapeType.concavePolyhedron] 
    let physicShape = SCNPhysicsShape(geometry: ring, options: shapeOptions) 

    let body = SCNPhysicsBody(type: SCNPhysicsBodyType.kinematic, 
           shape: physicShape) 
    body.categoryBitMask = CollisionTypes.wall.rawValue 
    body.collisionBitMask = CollisionTypes.beachball.rawValue 
    body.isAffectedByGravity = false 
    body.mass = 0.5 
    ringNode.physicsBody = body

來源

2017-10-18 22:39:05

ARKit：球沒有穿過SCNTorus洞

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