...
A good way to visualize this effect is thinking of projecting light through several photographic slides. It can be useful to create interesting blends between the textures used in the BSDFs of the different layers and also to create plastics that have a thin shiny coating on the surface that still allows the color of the plastic to show through beneath it.
| Warning |
|---|
It is not recommended to have more than one Layer above the others set to Additive mode if its Layer weight is already 100%. This can make unnaturally bright materials which can introduce precision errors in the render (usually visible as bright spots) |