PLUSH HYENA of DOOM wrote...
Because a Demoness really shouldn't have to go sticking her horns back on all the time - and combining them into the head model has proven... troublesome so far, with regards texture mapping.
You're obviously not afraid of using haks, so this is actually easier than it sounds, but not via scripting. You can use the trick OldTimeRadio came up with for adding a second texture to a body part...so you could add the horns to the head model and make use of your VFX horns' existing texture and mapping.
Link:
How To: Display a TGA & PLT on the Same Body Part at the Same Time by Old Time Radio
Basically:
1. Make up a dummy .tga file you're willing to "sacrifice". I usually go 2 pixels x 2 pixels.
2. Open your demoness' head in gmax (or 3ds, whatever).
3. Add your desired horns to the head model. Make sure it looks good with the "real" texture, then swap in the "sacrificial" texture and save/export.
4. Create/modify a .txi file with the same name as the "sacrificial" texture. The file name (without extension) of the "real" texture goes in here.
5. Add all five files to your hak (head model, existing head plt, sacrificial texture, txi, and real horn texture) and enjoy.