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How do I achieve an animated decal that's vertical (say on the wall) instead of flat on a surface? Say I wanted the lava decal to look like it's running down the walls, how?

I've tried rotating the decal in FPSC, I've also tried changing the orientation of the decal in a script:

;Artificial Intelligence Script
; 0-once face player
; 1-once keep angle
; 2-loop face player
; 3-loop keep angle
; 4-once face up
; 5-loop face up
; 6-character-spot-decal (at end of entity characters gun if available)

;Header
desc = Runs Decal Loop

;Triggers
:state=0:rundecal=3

;End of Script

I can get it to face the player vertically, but only if it rotates to face the player, which I don't want, I want it to stay put in a vertical position.

If anyone knows a step-by-step way it would be great to include it in my guide!

Use the decalfixed.fpi or rundecal=3 and rotate the decal in the editor to suit.
I would use a different .x reference model for this so you can see the orientation of the decal say a plane or box.

You seem to be doing it correctly but may not be rotating it in editor,if you just apply the fixed script the decal will lay horizontal.

I did both of these but no matter what is still comes out horizontal (like on the floor). You couldn't send an .fpm file that works could you?

GOT IT!! I was rotating the green arrows vertically, it should be the red arrows. Something to put in my guide I think.