In article <39024267.8486FFE3@videotron.ca> , pk <thi### [at] videotronca>  
wrote:

> But, how come you have to shoot rays from the lightsource to know the
> shadows? Can't you just continue until you reach a light, and if so, you
> know if the points before are lighted or not??

Think about it:  How many rays do you need to send out to hit one point if
you don't even know which direction it is in? - As a point is infinitely
small you will need an infinite number of rays!

> BTW, what does "L: a*x + b*y + c*z + offset = 0" mean?? i don't
> understand the offset thing 8(

You should really try to get the book I mentioned ... it explains all that!


     Thorsten

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