SceneKit：观察模型的相机

Question

有没有办法让相机看一个模型？这是我尝试过的：

// Add Character
func addModel(name:String)
{
    // Remove old model
    self.modelNode.removeFromParentNode()
    modelNode = SCNNode()

    // Load COLLADA Character
    if let myScene = SCNScene(named: "Assets.scnassets/"+name+"/"+name+".dae")
    {
        // Recurse through all the child nodes in the Character and add to modelNode
        for node in myScene.rootNode.childNodes as [SCNNode]
        {
            modelNode.addChildNode(node)
        }

        // Add modelNode to scene
        self.rootNode.addChildNode(modelNode)
    }
    else
    {
        print("Error loading character: "+name)
    }
}

// Add Camera
func addCamera()
{
    // Remove old model
    self.cameraNode.removeFromParentNode()
    cameraNode = SCNNode()

    // Set up a new camera
    cameraNode.camera = SCNCamera()

    // Set up LookAtConstraint
    let constraint = SCNLookAtConstraint(target: modelNode)
    cameraNode.constraints = [constraint]

    self.rootNode.addChildNode(cameraNode)
}

这没有结果。意思是，我看不到模型。如果我不运行 addCamera()，模型就会出现。但是我不想让相机太看模特

Answer 1

改用 SCNLookAtConstraint(target: modelNode.childNodeWithName) 确实对我有用。我假设父节点不包含子节点约束。

SceneKit：观察模型的相机

SceneKit: Camera to look at model

ios

scenekit