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
｜
255
let noiseNormalMapTexture =
noiseTexture.generatingNormalMap(withSmoothness: 0.1,
contrast: 1.0)
一旦获得法向贴图纹理，我们就可以在几何体上通过
normal
属性来使用它：
greenMaterial.normal.contents = noiseNormalMapTexture
讨论
当计算某个受光物体的颜色时，
3D
渲染器会一个像素一个像素地计算其亮度，每
个像素的亮度取决于光线的方向以及光线到达物体表面的角度，这个角度就叫作法
向。在普通的场景中，物体任意位置的法向都垂直于物体表面；假设你将
iPhone
平放到桌面上，手机向上的那一面的法向就是正上方。
当你在一个物体上应用法向贴图时，我们改变了默认的法向值，并告诉
3D
渲染器
光线反射将发生轻微的波动。由于肉眼观察到了这些变化，物体的表面于是显得粗
糙不平了。当我们将单一纹理贴到材质上时，这会导致物体显示出更多的几何细节，
通常会显得更加自然。
8.11
约束对象
问题
我们想让物体的位置和旋转角度被其他物体约束。
解决方案
首先，创建一个被约束对象：
let pointer = SCNPyramid(width: 0.5, height: 0.9, length: 4.0)
let pointerNode = SCNNode(geometry: pointer)
pointerNode.position ...
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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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