1. Copy the acid fpe (files/entitybank/generic/decals/acid.fpe)
2. Rename it "water"
3. Paste this code into the FPE
;header
desc = Water
;ai
aiinit = repeatsound.fpi
aimain = decalflat.fpi
aidestroy = disappear1.fpi
;orientation
model = particles.x
textured = particles_d.tga
defaultheight = 0.5
transparency = 0
;identity details
strength = 0
isimmobile = 1
ismarker = 4
;decals
decalmax = 1
decal0 = water
You can change the transparency in the fpe, it will look good too.
The Attachment is my animated water decal that looks bad in game
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