> For the complete documentation index, see [llms.txt](https://okzkx.gitbook.io/blogs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://okzkx.gitbook.io/blogs/game-tech/engine/render/render-pipeline/hclip.md).

# hclip

Homogeneous Clip Coordinates (HClip)

世界坐标 -> 视口坐标 -> 裁剪空间(ClipSpace, NDC) -> 其次裁剪空间(HClip)

* **Model Space to World Space**: Transforming the object's vertices from the object's local coordinate system (model space) to a common world coordinate system.
* **World Space to View Space**: Applying the camera transformation to move the vertices from world space to view space.
* **View Space to Clip Space**: Performing perspective division and projection to map the view space coordinates to normalized device coordinates, where the visible space is defined as a cube with coordinates ranging from -1 to 1 in each dimension.
* **Clip Space to Homogeneous Clip Space**: Adding the homogeneous coordinate (w) to the clip space coordinates, creating homogeneous clip coordinates. This step prepares the vertices for further processing in the graphics pipeline.