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管线中的坐标变换
2022-06-12 22:20:00 【ZEKEGU1997】

- 如上图所示,一个物体首先是在局部坐标系中,经过model矩阵变换,包括旋转平移缩放等等,到了世界坐标中。
- 通过view矩阵变换到观察空间中。view矩阵实际上是一个平移相机的矩阵T与坐标变化的矩阵R合成的。view矩阵需要相机位置、向上向量、目标位置三个向量。

- 通过projection矩阵变换到裁剪空间中。以上这三步一般在顶点坐标系中进行。
- 通过透视除法,转化为标准化设备坐标(Normalized Device Coordinate, NDC)。
- 通过视口变化,转化到屏幕空间中。
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