how can I make a script effect only selected faces?

[SiaNova Portal]

I know pretty much nothing when it comes to scripts. so I brought this skirt and I want to add a rainbow script to it. I obviously don't want the skirt as a whole going through the spectrum but part of it's faces. any ideas? 

[Rolig Loon]

You don't "add" a rainbow script to it; you write a script specifically for that skirt. The mechanics of doing a texture change or a color change are simple enough, but the first challenge is knowing which links and faces to change. Then you specify those link/face numbers in the script.  The second challenge is having textures that are meant to work on that particular skirt.  You can usually change colors easily enough, but skirts these days are mesh objects; that complicates texturing. When you texture a mesh object, you apply textures that are based on the UV map that the creator made for the object.  Any other textures just don't fit.  They end up looking all wonky. The bottom line is that you have to do at least some custom modifications to make a texture/color change script work on your own skirt.

[SiaNova Portal]

1 hour ago, Rolig Loon said:

You don't "add" a rainbow script to it; you write a script specifically for that skirt. The mechanics of doing a texture change or a color change are simple enough, but the first challenge is knowing which links and faces to change. Then you specify those link/face numbers in the script.  The second challenge is having textures that are meant to work on that particular skirt.  You can usually change colors easily enough, but skirts these days are mesh objects; that complicates texturing. When you texture a mesh object, you apply textures that are based on the UV map that the creator made for the object.  Any other textures just don't fit.  They end up looking all wonky. The bottom line is that you have to do at least some custom modifications to make a texture/color change script work on your own skirt.

took awhile but finally figure it out. just needed some patience, a time machine, and more patience.

 

[Rolig Loon]

Yay!   Yeah, that works if you are doing nothing more complicated than alphas and coloring.  I couldn't tell from your post whether you meant just that or whether you meant retexturing, which is sort of what the rainbow idea implied to me.  I'm glad the easy way worked for you.  Congratulations.