breaking bake BIRP 2022.3.46 in shaders set forward only

[Dawie3565]

--- BIRP 2022.3.46 --- ASE shader set render path in shader forward only

forward Only

same shader set All

[diogovtx]

This is not a bug.

What's happening is that Amplify Impostors does not support baking of Transmission or Translucency because it's a Forward-only feature.

To be able to support all BiRP shaders we decided to bake using the deferred pass, which has a fixed layout/format. Independently of the base shader, the outputs are always the same. This isn't the case with a Forward shader, which usually outputs only color and depth.

To be able to support this, the user needs to implement his own Baking shader and assign that to the Baking Preset. We have a sample explaining how this works, called "Custom Baking", on all scriptable pipelines, including BiRP. Custom baking, unlike using the default/null baking shader, uses Forward instead of Deferred. That way we can output whatever we want to use on the impostor.

This is what it looks like:

Can be assigned here directly, or they can create a new preset:

And assign it to the Impostor component:

The outputs can be customized to include Transmission or Translucency in the bake, or any other texture information that is required. In this bake shader, some math can run during baking to avoid doing it at runtime in the impostor shader, for example, mixing two Albedo textures.

Hope this helps. Feel free to post any follow up questions.