Thanks for the answers, but I have to admit I'm not quite following:
what if I know the luminance of a particular bulb (real) and I
want to model it in POV. Is there a way to traduce, say, candelas per
sqr meter, in POV units? 

Txs again!



Kari Kivisalo wrote:
> 
> Jaime Vives Piqueres wrote:
> >
> > I've no idea on how to relate light
> > intensity to POV-Ray light_sources...
> 
> You are free to choose any units and then interpret the results
> based on this decision. Just remember that pov outputs only
> integer values (0-1) so you will have to choose a scene dependant
> scale factor to prevent overflows.
> 
> > and of course I don't understand
> > your point about using alpha channel for that.
> 
> Or you can use the transmit channel of a pigment if the data
> is red in and interpolated within pov script. I don't know
> any other way to control the radiation distribution of a light
> source. There was a patch for light sources which did essentially
> the same thing.
> 
> _____________
> Kari Kivisalo

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