If you don't want to mess with mentalray and finalgather stuff you can always hand-place some colored lights and bake out lighting pass separately, which can be then screened on top of original diffuse. Or bake out complete map with handplaced lights + skylight
Is it for nice rendering or actual game asset? If it's for rendering, you can just select those buttons with magic wand maybe, duplicate on separate layer, switch to screen mode and apply some gaussian blur. Like this ` You can place yellowy omni light with limited distance near keypad to actually cast some light on…
thanks guys for your answers, so far yes, baking the light into the diffuse. found lots of vig posts in all the different 3d forums when i searched for this subject ! :) i gotta say i'm not against scripts or plugins - so if anyone has something else than this NEON-script - let me know :D this whole mental ray stuff is not…