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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252
｜
第
8
章
8.7
使用文本节点
问题
我们想在场景中显示
3D
文本。
解决方案
3D
文字也是一种附着在节点上的几何形状。要创建一个
3D
文本对象，需要用到
SCNText
类，然后将它附着到节点上：
let text = SCNText(string: "Text!", extrusionDepth: 0.2)
//
文字的高是
2
个单位（米）
text.font = UIFont.systemFont(ofSize: 2)
let textNode = SCNNode(geometry: text)
//
放到胶囊对象的左上位置
//
（胶囊的高度是
10
个单位）
textNode.position = SCNVector3(x: -2, y: 6, z: 0)
//
将文本添加到胶囊节点（不是场景的根节点！）
capsuleNode.addChildNode(textNode)
讨论
当我们创建一个
SCNText
对象的时候，我们需要指定它的字体属性，包括文字所
用的字体和字体的大小。需要注意的是，字体大小采用的是
Scene Kit
的单位，而
不是屏幕像素。
8.8
自定义材质
问题
我们想控制物体反射光线的方式。
解决方案
要控制物体的外观，我们需要创建材质。在
Scene Kit
中，材质用
SCNMaterial
类表
示：
Scene Kit
｜
253
//
使材质显示为绿色而且反光
let greenMaterial = SCNMaterial()
greenMaterial.diffuse.contents =
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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.