Using a texture rendered with a camera as a shader parameter

I'm questioned about how to use a texture rendered by camera as a shader parameter.
1) I have the first camera rendering things.
2) I have the second camera rendering a certain layer which is not rendered by first camera.
3) I want to add a shader effect to the first camera using texture rendered by second camera as a shader parameter.

How does one should get a texture from the second camera and give it to first camera's material as a parameter?

Thanks for any help =)

 

Make a render texture, assign it as the second camera's target texture and the material's texture parameter. You can do this in the editor by making a render texture asset or from script at runtime. Make sure the second camera's "Depth" setting is lower that the first camera so it renders first, otherwise you'll be getting the previous frame's rendered image.

 

Thank you again!
But... By the way.. I've got a little other problem. Second camera renders transparent objects and I want get a texture from the second camera with transparency. Setting background color to 0,0,0,0 for second camera works strangely. Is there a way to achieve that?

 

Use a premultiplied alpha shader to draw the render texture.
https://forum.unity.com/threads/dar...awn-into-a-rendertexture.516545/#post-3385666