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

You may want to use a custom shader on "Scene View" for debugging. 

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);
}

This article applies to Unity versions 4.1+

More information about SetSceneViewShaderReplace

• forums: http://forum.unity3d.com/threads/shader-replacement-problems.192520/
• Unity Answers: http://answers.unity3d.com/questions/454091/how-to-reset-shader-replacement-in-scene-view.html