Ok ok I understand π
It was just a little request, but I use lot of the "additive technique light" to my animation usually.
Actualy if is not possible in Spine, I will try with Unity to reproduce this effect π
My goal was to make this effect easily to Spine, and when I saw the "check button additive" I thought it will be possible to use it in "Animate mode" π
After some test, some crash with a "additive effect asset" I decided to don't use it for the moment. My scene crash when there are more of one effet additive, in Animate mode. I don't know why, it's strange :/
Maybe in the futur, you can update the "additive effect" π
So, thanks you guys for you support!