我正在尝试在SceneKit中制作一个pipe及其物理体。letBoxGeometry=SCNTube(innerRadius:5,outerRadius:12.5,height:4)Box=SCNNode(geometry:BoxGeometry)Box.pivot=SCNMatrix4MakeRotation(Float(M_PI_2/8),0,1,0)Box.physicsBody=SCNPhysicsBody(type:SCNPhysicsBodyType.Static,shape:nil)Box.physicsBody?.mass=5Box.categoryBitMask=c

已更新我使用以下Material创建了一些SCNTube:letradius:CGFloat=0.3letheight:CGFloat=0.5letcolor:UIColor=UIColor(red:0.17,green:0.62,blue:0.76,alpha:1.0)letgeometryTube=SCNTube(innerRadius:(radius-0.1),outerRadius:radius,height:height)letmatOuter=SCNMaterial()matOuter.diffuse.contents=colormatOuter.transparency=