Thank you so much Harald, it works well with the Sprite Shader!

After doing some tests on the 4.0 Beta we still can't reach a specific Emissive/Additive effect.

We have a creature with different variations using the same rig animation (example a run cycle). The creature is composed of different body parts (example: a normal leg with multiple bones and a spiky version of the same leg) which we group together under the same slot and activate only the images versions we want visible when animating. Until here, all goes well. But, we can't find a way to apply an emissive effect on top of one of the existing base colour for a leg (example : optional dots we want to glow in the dark over the base colour skin). We would need a way to be able to set an additive mode on just the emissive effect (as an unlite material) while having the base colour of the leg active (as a lite material) at the same time.

How would you reach that target? Would it be possible to assign an additive to an individual images/mesh with in a slot instead of on the entire slot itself?
Thanks a lot of any tips!