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Is it possible to add custom shaders / Render states preview mode to the Unity Scene View?

Symptoms 
  • I would like to know if it is possible to add custom shaders / Render states preview mode to the Unity Scene View
Cause
You may want to use a custom shader on "Scene View" for debugging. 
 
Resolution
Currently, you cannot add a new option into the Render Mode drop-down menu on Scene View. You can however use a MenuItem to add your custom shaders and the function SetSceneViewShaderReplace to load them on Scene View.  
 
With this snippet, you can load your custom shader on Scene View: 
[MenuItem("Tools/Custom Render Mode on SceneView")]
static void SceneViewCustomSceneMode() 
{
         SceneView.currentDrawingSceneView.SetSceneViewShaderReplace(Shader, null);
}
 
Now, to reset the render mode, you can use: 
[MenuItem("Tools/Clear SceneView")]
static void SceneViewClearSceneView() 
{
         SceneView.currentDrawingSceneView.SetSceneViewShaderReplace(null, null);
}
More Information
This article applies to Unity versions 4.1+
More information about SetSceneViewShaderReplace
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