I needed spectral versions of some of the character models I'm working with on a current project... And I'm lazy. That combined with the fact that I've had no luck making transparent textures in Gimp and, although I do have Adobe Illustrator, I do not have Photoshop... Plus I have no clue what I'm doing in Illustrator and only have a copy because I used to be an IT manager for a printing company several years ago.
All of the above resulted in this shader - Which is something that's probably been done before, But I couldn't find any mention of it in the forums. Entities this is applied to will not respond to ambient or dynamic lighting in the scene, although texture details and color are preserved. By default, the alpha transparency of any entity this is applied to is set to 15%. To adjust the level of transparency, open in notepad and look for the following line ->
return tex2D(colorSampler, Tex) * Diff * float4(1,1,1,0.15);
Just change the 0.15 to the percentage of transparency you you want.
I'm kinda playing around with ideas to make a slightly more intense/dynamic version of the shader, since this is pretty basic.
