Constant Texture Problem

[ob1]

I have modelled a city for a student project and I now would like to put a windows texture with constant little white squares, to give the effect of room lights on my buildings.
I will be using global illumination, so the windowed texture will be in a shadowed area.
I cannot find a way of illuminating the squares constantly to give this effect?
The texture has an alpha channel so I can hide the black background but I still have no way of illuminating the squares.
I cannot use a constant material because I need the material underneath the texture to be blinn.
hope you know what I'm trying to say, thanks in Adv.

[colinsenner]

In reply to:

use higher values for ambient and/or diffuse for the window tiles. You cant reach the constant shading this way but in most cases it will look quite ok.
Another way would be a constant shaded object underneath the other. Make the windows transparent with the alpha map.
I got excellent result with additional color maps on the constant obj to simulate different illumination.

hope this help

sven

[ob1]

Thanks Sven I'll have a go, the ambient and diffuse is already up high, but making the windows tranparent over a constant texture sounds interesting.