Andrew the Orchid nous apporta ses lumieres ainsi en ce 2004-12-11 
15:49... :

> I'm talking about glare.
>
> For example, the lights on your Christmas tree. Each light measures 
> about 5mm across, and about 15mm long. If you took a lump of wood that 
> size and looked at it from across the room, it's barely visible. If 
> you render it with POV-Ray, the same thing happens.
>
> And yet, because a light glows, you CAN see if from many meters away, 
> even though it's very small. Why?
>
> [And how do I tell POV-Ray about this? ;-) ]
>
> Surely I'm not the first person to wonder...
>
> Andrew.

A small luminous object alway apears larger than it realy is. It's a 
byproduct of the way the light censitive cells in your retina are 
connected together and to some scattering inside the eye and the retina 
itself.
You can add a little media containing sphere around the lights, around 2 
to 4 time the size of the "lights". That media could be emissive or 
scattering.

Alain

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