Question by V1nkey · Sep 28, 2017 at 12:22 PM · camera rendering post processing

How to apply a shader on a part of the scene ?

Hello everyone,

I am encountering some issues while trying to apply a shader on some gameobject of the scene.

Here is what I want to do : I have a scene with a point cloud as a gameobject on a layer (let's say layerA) and other objects without layer. I would like to apply my shader (which intensify the edges of the objects) only on objects which are part of layerA.

In order to do this, I instantiate two cameras and set their cullingMask to "layerA" and "everything except layerA". Then I apply my shader on the first camera view and try to render the view with the shader and the other camera view.

 void OnRenderImage(RenderTexture source, RenderTexture destination)
 {
   int layerValue = 10;

   Camera cam2 = camera;
   camera.cullingMask = ~(1 << layerValue);      
 
   cam2.cullingMask = (1 << layerValue);
   camera.depth = cam2.depth + 1;
   cam2.clearFlags = CameraClearFlags.Depth;
 
   Material mat = material; // shader
 
   Graphics.Blit(source, destination, mat, -1);
 }

My problem is that after this process, my gameobjects with no layer are behind my point cloud. Here is a before/after picture :

Before alt text