ios - SceneKit 中的场景渲染不正确

Question

我在场景中创建了一个地板并将 collada 文件 (.dae) 加载到我的场景中，并尝试在该模型下方创建一个平面。但是我有如下问题。

此问题仅在使用自定义相机时出现。使用系统相机时场景渲染正确，即如果没有添加自定义相机我的代码如下:

import UIKit import SceneKit

class TestVC: UIViewController, SCNSceneRendererDelegate {

var cameraNode: SCNNode!
var modelNode: SCNNode!
var scnView: SCNView!
var camNode: SCNNode!

var cameraPosition: SCNVector3!

override func viewDidLoad() {
    super.viewDidLoad()

    scnView = SCNView(frame: self.view.frame)
    scnView.delegate = self
    view.addSubview(scnView)
    scnView.delegate = self

    let scene = SCNScene()
    scnView.scene = scene

    //camera
    let camera = SCNCamera()
    cameraNode = SCNNode()
    cameraNode.camera = camera
    camera.zFar = 1000
    cameraPosition = SCNVector3(0, 100, 150)
    cameraNode.position = cameraPosition
    scene.rootNode.addChildNode(cameraNode)

    //floor
    let floor = SCNFloor()
    floor.reflectivity = 0
    let floorNode = SCNNode(geometry: floor)
    let firstmaterial = SCNMaterial()
    firstmaterial.diffuse.contents = UIImage(named: "art.scnassets/grass.jpg")
    firstmaterial.diffuse.wrapS = SCNWrapMode.Repeat
    firstmaterial.diffuse.wrapT = SCNWrapMode.Repeat
    floor.materials = [firstmaterial]
    scene.rootNode.addChildNode(floorNode)

    let light = SCNLight()
    let lightNode = SCNNode()
    lightNode.light = light
    light.type = SCNLightTypeAmbient
    light.color = UIColor.darkGrayColor()
    scene.rootNode.addChildNode(lightNode)

    let light1 = SCNLight()
    let light1Node = SCNNode()
    light1Node.light = light1
    light1Node.position = SCNVector3(0, 200, -100)
    light1.type = SCNLightTypeOmni
    scene.rootNode.addChildNode(light1Node)

    let modelScene = SCNScene(named: "Barcelona Chair.dae")
    let solNode = modelScene?.rootNode
    solNode?.eulerAngles = SCNVector3(GLKMathDegreesToRadians(-90), 0, 0)
    scene.rootNode.addChildNode(solNode!)
    scnView.allowsCameraControl = true

    let plane = SCNPlane(width: 100, height: 100)
    let planeNode = SCNNode(geometry: plane)
    planeNode.pivot = SCNMatrix4MakeRotation(Float(M_PI_2), 1, 0, 0)//(CGFloat(M_PI_2), 1, 0, 0)
    planeNode.position = SCNVector3(0, 1, 0)
    plane.firstMaterial?.diffuse.contents = UIColor.redColor()
    scene.rootNode.addChildNode(planeNode)

}

Answer 1

您可能看到的是所谓的“z-fighting”。基本上，你的地板和你的平面是共存的——它们是共面的——所以它们的渲染是不明确的。尝试将平面的位置设置得比地板平面高一点，将其抬高一点，您应该会看到这个问题消失了。