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几何变换(四）

8. 视图变换管线概览

一个物体从独立的物体最终转换为2D图像，期间经过如下坐标变换

9. 摄像机视图变换（Viewing/Camera Transformation)

9.1 定义

视图变换是将物体的世界坐标系转换到摄像机的坐标系

摄像机坐标系以观察点(eye)为原点，向前方向为-z轴，x轴指向右侧（右手坐标系）
所以

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10.2 求解过程

10.2.1 从视锥体到立方体

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11. 正交投影变换(Orthogonal Projection Transformations)

11.1 定义

正交投影没有“远大近小”的效果

11.2 求解过程

相比透视投影，正交投影只需要将一个立方体形状的摄影范围最终映射到标准设备坐标系(NDC)下的一个标准立方体(Cuboid)即可

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