Render the scene only using a given a renderType tag

Question

Hi, is there a way I can tell the a Camera to render the whole scene, and only render objects with a specific RenderType

With Out replacing their current shader...

Basicly, I want to write an additional pass on multiple Shaders tagged renderType="AwesomePass" MainCamera will do its its normal stuff. Then I tell a 2nd camera to render the scene only using the AwesomePass, and then each object that has an AwesomePass will use its Own shader code, and not a replacement One.

another way to put this is...

I want to have Multiple Shaders that are on a Select few objects to have a Special pass tagged with renderType="AwesomePass" When I call a render to the scene, only the objects, that use a Shader that is tagged with "AwesomePass" will then render That specific Pass.

I am rending this AwesomePass to a render Texture. and Again, I DO NOT want to replace their current shader

Answer 1

I hade Posted my question here as well : http://forum.unity3d.com/threads/render-the-scene-only-using-a-given-a-rendertype-tag.254976/

After everyones Post, I was able to get the effects I wanted via Making Multiple Cameras to Control when things were Renderered. I also found out that when using a Replacement Shader, its being executed as if its running in that file : IE: that you have access to all the same properties and variables

And so I just had to do write a replacement shader for every rendertype I had that would Output this information. But instead of of using RenderType = AwesomePass. I used AwesomePass = Terrain, and AwesomePass = Fun, etc etc. Since I didn't want to completely overwrite the RenderTypes. Thusly because only 3 Different Shaders use my AwesomePass tag I only had to write 3 shaders.

I also did use some Camera Masking for some of the Render Passes. Thanks for the help :)

Answer 2

I think you are after culling mask:

http://docs.unity3d.com/ScriptReference/Camera-cullingMask.html

EDIT: Considering your comment, so you want to modify the rendering of an object based on what camera is rendering. You can use one of the callback from MonoBehaviour for instance:

http://docs.unity3d.com/ScriptReference/MonoBehaviour.OnPreRender.html

Consider this script below:

 public class ModifyRendering: MonoBehaviour {
     public Renderer render;
     void OnPreRender()
     {
         render.material.color = Color.white;
         if(tag == "MainCamera"){
             render.material.color = Color.red;
         }
     }
 }

You attach that to all cameras and add as many checks you need. There is a reference to the object meant to be controlled.

Here below is a more advanced version that discard the check from the callback and only makes it happen once:

 public class ModifyRendering: MonoBehaviour 
 {
      delegate void EventHandler ();
      event EventHandler OnRenderProcess; 
      public Renderer render;
      // The event is set in the Start once
      void Start()
      {
          if(tag == "MainCamera")
          {
              OnRenderProcess = SetForMain;
              return;
          }
          // Can be as many if you need here based on tag or culling mask or else
          OnRenderProcess = SetForCamera;
      }
     // The callback
     // Using OnPreCull you are even earlier in the process
     void OnPreRender()
     {
         OnRenderProcess ();
     }
     // The methods
     void SetForMain()
     {
         // Here changing color but you can also change the shader
         render.material.color = Color.blue;
     }
     void SetForCamera()
     {
         render.material.color = Color.white;
     }
 }

Render the scene only using a given a renderType tag

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