我正在使用“DAE”模型作为SCNGeometry。尝试将其用裁剪理体形:leturl=Bundle.main.url(forResource:"art.scnassets/half",withExtension:"dae")letsceneSource=SCNSceneSource(url:url!,options:nil)lettubeGeometry=(sceneSource?.entryWithIdentifier("Cube-mesh",withClass:SCNGeometry.self))!asSCNGeometrytubeNode=SCNNode(geometry:tu