SceneKit如何在SCNSphere内部添加纹理

Question

我知道如何在SCNSphere表面添加纹理，但当我将相机移动到球体中时，球是暗的，所以我想知道如何在内表面添加纹理，以下是我现在使用的：

let boingBall = SCNSphere(radius: 4.0)
        let boingBallNode = SCNNode(geometry: boingBall)
        boingBallNode.position = SCNVector3(x: 0, y: 3, z: -10)
        scene.rootNode.addChildNode(boingBallNode)

        let material = SCNMaterial()
        material.diffuse.contents = UIImage(named: "texture.png")
        material.specular.contents = UIColor.whiteColor()
        material.shininess = 1.0
        boingBall.materials = [ material ]

谢谢

Answer 1

首先，让我们创建相机和灯光

func camAndLights(){
    let cameranode = SCNNode()
    cameranode.camera = SCNCamera()

    cameranode.position = SCNVector3(x: 0, y: 70, z: 200)
    cameranode.camera?.zFar = 1000.0



    let lightbrnl = SCNNode()
    lightbrnl.light = SCNLight()
    lightbrnl.light?.type = SCNLight.LightType.directional
    lightbrnl.position = SCNVector3(x: 0, y: 200, z: 0)
    lightbrnl.light?.zFar = 1000.0
    lightbrnl.light?.color = UIColor.cyan

    scene.rootNode.addChildNode(lightbrnl)
    scene.rootNode.addChildNode(cameranode)

注意相机和灯光的位置。因为我们将使“世界”球体的半径更大。然后创建一个名为"world“的函数来创建我们的球体。将球体的第一个材质设置为isdouble = true，并将世界节点居中(0,0,0)

   func world(){
    let world = SCNSphere(radius: 700)

    world.firstMaterial?.diffuse.contents = UIImage(named: "sky")

    world.firstMaterial?.isDoubleSided = true
    let worldnode = SCNNode(geometry: world)

    worldnode.position = SCNVector3(x: 0, y: 0, z: 0)
    scene.rootNode.addChildNode(worldnode)

}

这应该就行了。只需在did加载函数中调用camAndLights()和world()即可。享受吧！