Render shadow output alpha

[MetemGir]

Hi everyone,
I need to know if there is a way to get the object shadow in a wall in without the wall material,
so the alpha channel would appears as gray scale and not pure white and black,
maybe I'm not be very clear, let me know if so,
thanks

[romullus]

Hi,

You need to apply shadow catcher material to the wall and set its mode to "for composoting". make sure to read and follow the instructions written in shadowcatcher's UI.