Edge Detection and Fog

[FlaxenFlash]

We we previously using the v1 stack on Unity 2017 with the old legacy Unity edge detection script. We've just updated to 2018, the v2 stack and started using this effect with the stack. The only issue we have run into is that the outlines are now drawing on top of the fog. Is it possible to change this or is it related to how fog is applied in the post processing stack now?

[jean-moreno]

I looked into it, and currently it doesn't seem like you can trigger an effect before the fog:

• in Forward, the fog is applied inside the objects' shader, so there's no way to have any post effect before that
• in Deferred, the fog is a applied as an internal post effect, however it always happen before the post processing stack, even if the order it is set to BeforeTransparent: In this case though, fog is actually executed by the Post Processing stack, which means that you could dig into the code and modify it so that the fog happens afterwards, but as far as I can see there's no way to do that without touching the code. (note: transparent objects in Deferred are actually drawn in Forward mode, so they apply the fog effect during the shading)

[FlaxenFlash]

Thanks for looking into that. I guess I can just modify the post processing stack then. We don't have any other custom effects that would be messed with by changing the order that fog and BeforeTransparent are applied. It seems like SSAO should suffer from a similar problem though and it doesn't. I wonder how that works.