RenderTexture black after recreating it

I have a RenderTexture which is the target texture for a Camera I've set up on the scene.

They work fine, but the RenderTexture quality is dependent on its width and height, so I want to make sure the width and height match the size of the screen.

I saw this trick on several forums:

Code (CSharp):

1. if (otherCamera.targetTexture != null)
2. {
3.     otherCamera.targetTexture.Release();
4. }
5.  
6. otherCamera.targetTexture = new RenderTexture(Screen.width, Screen.height, 24);
7. otherMeshRenderer.material.mainTexture = otherCamera.targetTexture;
8.  
9. otherCamera.Render();

However, after I tried it, the render texture is black. Any idea why that would happen?

 

If you play and press pause (or execute Debug.Break in the above code) and look at that camera you used for the snapshot, what does that camera see in the little editor inset editor window?

 

The camera preview correctly shows the scene. This is likely something about the render texture

 

I figured it out, the problem was in this line:

otherMeshRenderer.material.mainTexture = otherCamera.targetTexture;

Since I've created a custom shader for this, which the material uses, this isn't the correct way to set the material texture. My shader accepts the texture as an argument, so the fix was to pass it like so:

otherMeshRenderer.material.SetTexture("MyTexture", otherCamera.targetTexture);