My RenderTexture Can't see anything

I take a renderTexture to a camera and there is a mod in the camera,the mod shader used Toon/LightedOutline,but if I create a material use the renderTexture and use shader transparent/Diffuse,there is nothing can see from the material. If I change mod shader to Diffuse,I can see the mod from the material,but the mod hair is wrong,If i change the material which use RenderTexture to Diffuse,I can see the Mod from it,but I can't cut out the backGround from RenderTexture. What should I do if I want to show the Mod correct from the material which use RenderTexture,and also I can cut out the BackGround from RenderTexture

The Mod in Camera,but I can't see anything from the material which use RenderTexture.