uiimage – Swift：设置SCNMaterial适用于SCNBox但不适用于从Wings3D DAE加载的SCNGeometry

let BoxNode = SCNNode()

    // Create a Box
    BoxNode.geometry = SCNBox(width: 1,height: 1,length: 1,chamferRadius: 0.1)
    let numFaces = 6

    scene.rootNode.addChildNode(BoxNode)

    // create and configure a material for each face
    var materials: [SCNMaterial] = Array()

    for i in 1...numFaces
    {
        let material = SCNMaterial()
        material.diffuse.contents = UIImage(named: "texture")
        materials += material
    }

    // set the material to the 3d object geometry
    BoxNode.geometry.materials = materials

它会生成一个框,每个面都是方格图像.

尝试在Wings3D中创建的简单库存几何体,保存到DAE,并在应用程序中加载,给我一个合适的形状,但脸上没有阴影和图像：

let BoxNode = SCNNode()

    // Load the geometry
    let urlToColladaFile = NSBundle.mainBundle().URLForResource("Objects",withExtension:"dae")
    let scenesource = SCNScenesource(URL:urlToColladaFile,options:nil)

    BoxNode.geometry = scenesource.entryWithIdentifier("dodecahedron3-0",withClass:SCNGeometry.self) as SCNGeometry
    let numFaces = 10

    scene.rootNode.addChildNode(BoxNode)

    // create and configure a material for each face
    var materials: [SCNMaterial] = Array()

    for i in 1...numFaces
    {
        let material = SCNMaterial()
        material.diffuse.contents = UIImage(named: "texture")
        materials += material
    }

    // set the material to the 3d object geometry
    BoxNode.geometry.materials = materials

我错过了什么？