1. 官方文档

https://docs.unity3d.com/2022.3/Documentation/Manual/render-pipelines.html

2. 一些教程

2.1 Catlike coding

非常细节，一步步的指导

https://catlikecoding.com/unity/tutorials/rendering/

3. 渲染要做的事

A render pipeline follows these steps:

1. Culling, where the pipeline decides which objects from the scene to display. This usually means it removes objects that are outside the camera view (frustum culling) or hidden behind other objects (occlusion culling ).
2. Rendering, where the pipeline draws the objects with their correct lighting into pixel buffers.
3. Post-processing , where the pipeline modifies the pixel buffers to generate the final output frame for the display. Example of modifications include color grading, bloom, and depth of field .

4. 三个render pipline

The Built-In Render Pipeline

The Universal Render Pipeline (URP) is a Scriptable Render Pipeline ,可定制

The High Definition Render Pipeline (HDRP) is a Scriptable Render Pipeline

5. Build-in render pipeline

5.1 Graphics tiers等级

通过 graphics tiers 设置等级

Graphics.activeTier

Project-setting中可以设置

5.2 render path

5.2.1 Forward render

只能算4个点光源

5.2.2 Deferred Shading

6. Shader

shader是gpu上的程序

unity有很多内置的shader.参考下表

https://docs.unity3d.com/Manual/shader-built-in.html

6.1 怎么写shader

可以用shader graph,hlsl语言

6.1.1 Shader graph

https://docs.unity3d.com/Packages/com.unity.shadergraph@17.0/manual/index.html

6.1.2 HLSL语言

https://docs.unity3d.com/Manual/writing-shader-writing-shader-programs-hlsl.html

6.1.3 Shaderlab

Unity 定制的语言

https://docs.unity3d.com/Manual/SL-Reference.html