如何使用 SceneKit 添加背面图像作为纹理 iOS

Question

我是 SceneKit 的新手并创建了一个对象我添加了一个图像作为对象的纹理但是它显示在正面和背面。我想要的是在它后面显示另一个图像。是否可以添加一个物体有两个纹理？

    let scene = SCNScene()
    var planet : SCNGeometry
    let tempScene = SCNScene(named: "FrameOBJ.obj")
    planet = tempScene!.rootNode.childNodes[0].geometry!
    let material = SCNMaterial()

    let url = URL(string: "www.imageasf.com/123.png")
    let data = try? Data(contentsOf: url!) //make sure your image in this url does exist, otherwise unwrap in a if let check / try-catch
    let image = UIImage(data: data!)

    material.diffuse.contents = image
    material.diffuse.wrapT = SCNWrapMode.mirror
    material.diffuse.wrapS = SCNWrapMode.mirror
    material.isDoubleSided = true
    planet.materials = [material]
    let planetNode = SCNNode(geometry: planet)
    scene.rootNode.addChildNode(planetNode)
    sceneView.cameraControlConfiguration.allowsTranslation = true
    sceneView.allowsCameraControl = true
    sceneView.scene = scene

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Answer 1

我已经通过添加 Material 数组完成了。

    let tempScene = SCNScene(named: "untitled.obj")
    planet = tempScene!.rootNode.childNodes[0].geometry!

    var image = UIImage()
    let url = URL(string: "https://www.images123.jpg")!
    //make sure your image in this url does exist, otherwise unwrap in a if let check / try-catch
    var node = SCNNode()

    do {
        let data = try Data(contentsOf: url)
        image = UIImage(data: data)!
        node = SCNNode(geometry: SCNBox(width: 0.05, height: 1, length:1, chamferRadius: 0.5))
        node.geometry?.firstMaterial?.diffuse.contents = image
        // do something with data
        // if the call fails, the catch block is executed
    } catch {
        print(error.localizedDescription)
    }

    let  allMaterial = SCNMaterial()
    allMaterial.diffuse.contents = UIImage(named: "woods.png")

    let smallMaterial1 = SCNMaterial()
    smallMaterial1.diffuse.contents = image
    node.scale = SCNVector3(0.5,0.5,0.5)
    node.geometry?.materials = [smallMaterial1,allMaterial,smallMaterial1,smallMaterial1,smallMaterial1,smallMaterial1];

    scene.rootNode.addChildNode(node)
    print(node.scale)
    print(scene.rootNode.scale)
    sceneView.cameraControlConfiguration.allowsTranslation = true
    sceneView.allowsCameraControl = true
    sceneView.scene = scene

如何使用 SceneKit 添加背面图像作为纹理 iOS

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