This is really cool!  I want to point out that, though a spotlight is used,
the photon-tracing part treats it like a point light (so photons can light
up stuff outside of the cone of the spot light... that part of the code
isn't finished quite yet).

About the reflective caustics from the spheres... remember that the light
gets spread out (I can't think of an antonym for focused) very much, so
it really shouldn't be very bright (I like what you have here... it is
visible yet subtle).

-Nathan

Alan Kong wrote:
> 
>   Here's another test scene (59596 bytes) using Nathan's photon mapping
> implementation. Both reflective and refractive caustics can be seen. As
> always, comments and helpful tips are welcome.
> 
> - Alan
> 
>   -------------------------------------------------------------------------------
>  [Image]

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