On 2021-03-21 9:27 AM (-4), Bald Eagle wrote:
> Just a simple-minded idea for a solution:
> Will adding emission to the bulb and hood interior not work?
> You could tie its value to the brightness of the light source.

That's the idea, but no_radiosity has to be set on these surfaces. 
Radiosity should naturally be shut off for the bulb, otherwise the scene 
gets double the illumination that it should.  But no_radiosity is set on 
the hood interior _only_ to avoid artifacts, so this radiosity must be 
faked.

The replacement of the hood interior radiosity is complex.  The emission 
on the hood must be estimated from self-reflection from other parts of 
the hood interior, but _not_ from the bulb, since the light source takes 
care of that. The hood interior spotlight, on the other hand, must 
consider both the illumination of the hood by the light source and the 
self-reflection of the hood.

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