Wasn't it PM 2Ring who wrote:
>
>What about using a layered texture, with the bottom layer having a high
>white ambient and the top layer with the desired colour as filtered
>transparency? Or even using two objects, a coloured bulb object,
>containing a white glowing object?

I tried those, and I also tried having a high ambient no_image object
around a conventional object In all cases the radiosity comes from the
unclipped value and the visible image comes from the clipped value of
the same thing. So if the combination object is bright enough to cast a
decent amount of radiosity, then what you see is bright enough to suffer
from clipping.

>Other possible techniques:
>* Develop the scene using low light values & brighten up the scene with
>post-processing.

That works. You have to set the ambient of the non-bulb objects to zero,
or close to zero, and you have to also increase the saturation in post-
processing because brightening the image by large amounts will tend to
cause the saturation to be washed out.

I'd imagine that the increased length of the development/test cycle
would make it tedious to get it to look just right.

>* Use two-pass radiosity.

That works. It looks like the best solution. Run the first pass with the
"ambient rgb 100" and a radiosity save file. Run the second pass with
"ambient rgb 1" and a radiosity load file.

It's also easy to develop because the radiosity look exactly like it
does with "ambient rgb 100" and the bulb looks exactly like it does with
"ambient rgb 1".

-- 
Mike Williams
Gentleman of Leisure

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