如何在iOS SceneKit中将.dae文件加载到SCNNode中？ [英] How do you load a .dae file into an SCNNode in iOS SceneKit?

问题描述

我无法理解如何将 .dae 文件中的几何图形加载到iOS SceneKit场景图中。

I am having trouble understanding how geometry from .dae files should be loaded into an iOS SceneKit scene graph.

我知道您可以将 .dae 文件直接加载到SCNScene中：

I know that you can load .dae files directly into an SCNScene:

// create a new scene
let scene = SCNScene("test.scnassets/test.dae")

我也知道你可以创建一个空的SCNScene并将内置的3D对象作为子节点添加到其中：

I also know that you can create an empty SCNScene and add built-in 3D objects into it as child nodes:

let scene = SCNScene()
var sphereNode = SCNNode()
sphereNode.geometry = SCNSphere(radius: 1.0)
scene.rootNode.addChildNode(sphereNode)

在第二种情况下，您可以加载 .dae 文件进入SCNNode而不是使用内置对象？或者是否需要首先将所有 .dae 文件加载到SCNScene？

In the second case, can you load a .dae file into SCNNode instead of using built in objects? Or is it expected that all .dae files need to be loaded into the SCNScene first?

如果后者为真，那么如何将SCNNode对象放置在SCNScene下的场景图层次结构中的正确位置？编辑＃1：

If the latter is true, how then do you place the SCNNode objects into the right place in the scene graph hierarchy under SCNScene?EDIT #1:

现在这对我有用，这是@FlippinFun建议的修改版本。

This is working for me now, which is modified version of what @FlippinFun suggested.

let url = NSBundle.mainBundle().URLForResource("test.scnassets/test", withExtension: "dae")
let source = SCNSceneSource(URL: url, options: nil)
let block = source.entryWithIdentifier("ID10", withClass: SCNGeometry.self) as SCNGeometry
scene.rootNode.addChildNode(SCNNode(geometry: block))

但也许有更好的方法？以上涉及从.dae树手动加载每个标识符。在我的文件中，有一个带有子标识符ID2和ID10的节点SketchUp。此方法不允许您加载根SketchUp。 （我收到运行时错误。）

But perhaps there's a better way? The above involves manually loading each identifier from the .dae tree. In my file, there's a node "SketchUp" with child identifiers "ID2" and "ID10". This method will not let you load the root "SketchUp". (I get a runtime error.)

推荐答案

通常的模式是加载场景并检索您感兴趣的节点其名称使用

The usual pattern is to load your scene and retrieve the node you are interested in with its name using

[scene.rootNode childNodeWithName:aName recursively:YES];

然后你可以将这个节点重新显示到你的主场景。

Then you can reparent this node to your main scene.

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