How to add glow maps
1) Open the model you wish to add a glowmap to in NIFSkope
2) Change the Emissive Color to full white
3) Add a "ITEMNAME_g.dds" texture call to the texture properties for each piece that will have a glowing part
(warning: this will "corrupt" the NIF so be sure you have a backup copy before saving!)
4) Open the model's original "ITEMNAME.dds" in Photoshop (or comparable image-editing program)
(important: you'll have to do the following steps for each texture if a part using that texture will have something glowing)
5) Create a new layer and name it something like "Glowing Pieces"
6) On this new layer, mark the areas you want to glow with the color you want them to glow with
(brighter colors = more glow, darker colors = less glow)
7) Create another new layer, name it something like "Black Blanket," and place it between the original texture layer (background) and your "Glowing Pieces" layer
8) Merge all your layers. Your image should now look like a simple black image with a few bright spots on it
9) Go into the Channels section and delete the Alpha channel (it is unused and only increases file size)
10) Merge Layers and save the image as "ITEMNAME_g.dds" (DXT5, No Mip Maps)
This last bit of info is incorrect: every Glow Map in the game are DXT1 with MipMaps