January 2020
Intermediate to advanced
356 pages
6h 4m
Chinese
Content preview from Swift游戏开发经典实例
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Scene Kit
｜
257
然后我们可以检索其中的对象，如节点或者几何对象：
//
找到名为
'Critter'
的节点，然后加到场景中
let critterNode = critterData?.entryWithIdentifier("Critter",
withClass: SCNNode.self)
if critterNode != nil {
critterNode?.position = SCNVector3(x: 5, y: 0, z: 0)
scene.rootNode.addChildNode(critterNode!)
}
讨论
绝大部分
3D
编辑工具都支持导出为
COLLADA
格式的功能，包括
3D Studio
Max
，
Maya
，以及
Blender
。
COLLADA
文件可以包含多个对象，它就是一个仓库，
可以包含一大堆东西。我们可以在
3D
编辑工具中用不同节点层级、材质和灯光定
义一个完整的场景，然后将它们加载到场景中。
此外，如果在项目导航窗体中点击一个
COLLADA
文件，我们可以直接在
Xcode
中查看文件中的内容。
8.13 3D
物理学
问题
我们想让
3D
对象具备物理学特性。
解决方案
要向对象增加物理学特性，我们需要提供两个信息：碰撞体的形状，以及该对象的
physicsBody
。
首先定义形状：
var critterPhysicsShape : SCNPhysicsShape?
if let geometry = critterNode?.geometry ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.