H**omogeneous coordinate**


We can’t do compute perspective projection
사영기하학에서 n차원 사영 공간을 n+1개의 좌표로 나타내는 좌표를 동차좌표라 한다
$$\begin{pmatrix}x \\y \\z \\w \\\end{pmatrix}=\begin{pmatrix}x /w \\y /w \\z /w \\\end{pmatrix}$$
w로 1 많이 사용
normal coordinate is heterogeneous
![](https://www.notion.so/image/https%3A%2F%2Fs3-us-west-2.amazonaws.com%2Fsecure.notion-static.com%2F8ab17425-da89-41ce-92d7-1cad94a3a991%2FUntitled.png?table=block&id=10675c6f-ee08-488c-a005-5311147e51fd&cache=v2)



> [Homogeneous Coordinates | Yasen Hu](https://yasenh.github.io/post/homogeneous-coordinates/)





