Hi ,
It was poor naming on my part, but setting the fade params simply expose a normalized linear “T” value, “Decal Lifetime Opacity”, in the decal’s material graph. You actually need to use that node to affect how the decal will look over time. I implemented it this way for 2 reasons:
- Decals that don’t use this feature avoid the shader instruction.
- Artists are able to define what “fade” means for their decal. e.g. An energy field decal can change color instead of opacity.