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candycat1992 avatar candycat1992 commented on August 18, 2024

因为我们最终得到的应该是世界空间的点坐标，这个坐标很明显的特征就是它的w分量应该是1。而代码在从H得到D的过程中是不会保证w分量为1的，所以最后需要除以w分量保证它是一个有效的点坐标。

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adachigit avatar adachigit commented on August 18, 2024

多谢作者的解答，我想我应该明白了。：）

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vipshenji avatar vipshenji commented on August 18, 2024

作者您好:
关于这一节能否接着问个问题 ：
Matrix4x4 currentViewProjectionMatrix = camera.projectionMatrix * camera.worldToCameraMatrix;书中代码中得到的是当前帧的视角*投影矩阵（VP矩阵）。因为变换的结果是依赖于变换顺序的。想请问下这个相乘顺序能麻烦作者给解释下。 看你第四章说我们使用的是列矩阵，因此阅读顺序是从右到左不是很明白。

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candycat1992 avatar candycat1992 commented on August 18, 2024

@vipshenji 你好，你可以再仔细阅读一下第4章的相关内容，在纸上做一下练习题，仍然不懂的话欢迎再来更详细地提问 :)

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