本文介绍了一种在虚幻引擎4（UE4）中不使用C++，而是在材质编辑器内直接修改渲染管线的方法。通过修改CustomNode源代码并重新编译引擎，可以在材质编辑器中添加自定义节点，实现对渲染管线的直接控制。这种方法比使用C++更便捷，允许开发者轻松地将自定义代码推送到引擎着色器。
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小IVan：专题概述及目录
Introduce：
As we all know, we can't modify the main render pipeline of unreal engine 4。We can only edit our shader in the material editor. If we want to do something special which material editor can't meet our needs, Using c++ to modify the engine is currently the only viable method. My previous article has detailed implementation steps for this method.
小IVan：虚幻4渲染编程(材质编辑器篇)【第二卷：自定义光照模型】
However, Using c++ to modify the engine is not a good way. Because This method is very inconvenient. Below I will introduce a way to modify the rendering pipeline directly in the material editor.
Main Content：
Let's see the results first.
The code shown above is relatively simple, but the goal of modifying the rendering pipeline directly in the material editor has been achieved.
First we need to modify the source code of CustomNode。
Compile the engine, then open the material editor to add a CustomNode and you will see the following result.
If you write a macro to def, the macro will be pushed into the shader, and the rendering pipeline will get the macros.
Then we can write our code into the engine shader, which can be easily enabled using the material editor.
Summary and outlook：
Enjoy it ！
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