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.

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