For instance, the tattoos that come with Aery_Soul's Yaara (included pic with Kielo 2 morphs and Fantasy Spring outfit). Is there a way, without modifying the tattoo textures too much (or regrouping the mesh), to get those tattoos glowing in some color?

http://www.renderosity.com/mod/tutorial/index.php?tutorial_id=518&page=1
tells you how to use node masks. You won't get actual light-emitting tatoos, but by using a reflection mask, you can get tatoos which appear to glow.

actually, that's probably not quite how you'll want to do this.  basically, you can use a greyscale mask to do whatever you want, not just work on reflection.  so use the aery soul psd's to make a greyscale mask.  then plug the mask into ambient color that's the color you want and the strength you want.    or plug it into ambient strength.  or both.

i think reflection actually works like ambient (and alt diffuse, alt spect, etc.), but since it's meant to do something else, i'd avoid it.

note: if you're still using v3, then you can use some of the free unimesh stocking transmaps in a similar way. i have a few i acquired from here, i think.  you can hook them into the input of a blender or a color ramp node and mix them with a base texture(s), you can use them as input in math or color math node with other textures, etc.  basically, you can combine maps/materials with about as many (if not more) options as photoshop, with greyscale bitmaps functioning like layer masks. 

So basically I'd have to invert the tattoo texture to get it to do that.

That makes sense. :biggrin:

I didn't alter the original tattoo texture in any way, nor did I use a node mask (although I do consider than an option).

I used exactly the same scene as in my first post, only I turned Ambient on, plugged the Color Math node into it, and the tattoo texture into value 1 of the Color Math.

I was just fiddling with the Color Math node, because I figured there might be some function in it that would invert the image in Poser, and it seems the Log function helps me achieve what I wanted with minimal extra work.

And it seems setting both values to white in the Color Math node, and using Subtract works the same.

I didn't even think of the math functions. Cool idea. I like the way it turned out. 

Yeah, I'm fairly proficient in the Material Room, but I've still got a looooooong way to go before I can say I'm even close to mastering it.