Noob shader questions

I managed to understand how to plug in shaders inside pbr nodes, but how can I do someting like lit sprites?
Also it is quite surprising to have all these crazy lens flare effects and not have extremely simple fog…
My question boils down to this:

  1. How to access render textures(depth maps etc)?
  2. How to change material lighting mode?

SpaceEscape example covers fog and many other things that are missing from documentation.
Sprites are really basic in the engine and it is probably easier to make flipbook shader and apply it to plane with special material.

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