Hi!
I`m trying to set up render pass for composing it later with real photo. I`m stuck with problem of getting caustic pass. It`s easy to get it when surface(table in my case) is turned on, so the caustic is visible on it. But table should be invisible, that means that I need to get only caustic information on image. Shadow pass works fine - I`m getting just shadows and nothing more, with shadow matte shader. I was trying to use it with my caustic pass and I got some result, but ain`t sure if it`s suitable for composing. There is a .hip file with example of what I`ve described here. The caustic with shadowmatte shader is visible on alpha. How to get correct caustic pass?