I modified it but Broodlings, Zerglings, Ultralisks and Kerrigan can't splash attack as I put it to Splash Attack (Enemy) as I tried it.

Try changing in weapons tab the Graphics value to the same as the nuke (which is 172).

My logic is that splash damage need a bullet, a bullet need a flingy, and the flingy should be created through this option.

It's supposed to be invisible (I see "White Circle (Invisible)" as the label), so it may work without interfering in gameplay.

Make sure you've set the outer radius (targets for splash damage are searched within it).

That's what I can think of from the functions I've studied recently.Not tested.

edit: my bad.I think attackmelee (the attack command used in iscript for the units you mentioned) use a different logic with no use at all for bullets, so what I said probably would not have worked.
Make me think I will have to hook the corresponding function in GPTP to be more complete on my weapon hits hook.

Maybe somebody more used to iscript mods will be able to help you to change this "attackmelee" by something else, if that can fix the issue?

Post has been edited 1 time(s), last time on Apr 30 2016, 12:25 pm by UndeadStar.

I also want to know how to make melee units can do splash sttack...Modifying in DatEdit don't works.

Change the iscript to instead be either a standard attack or useweapon with the relevant id. As LivingMoon described, the attackmelee function doesn't actually spawn a projectile afaik it's more like a hitscan, so it won't function with splash. Use a hidden graphic (making one if necessary) so you don't see an actual projectile and then set the splash accordingly.