On 13 Jan 1999 09:09:00 -0500, par### [at] my-dejanewscom (Ron Parker) wrote:

>On Tue, 12 Jan 1999 22:20:41 -0600, Mike <Ama### [at] aolcom> wrote:
>>Looking really good.  When I are we going to get to see how it works?
>>
>>I never got around to getting a postscript reader to read Jensen's paper
>>on photon mapping.  Does it store the lighting values in the screen
>>space or does it use maps for the objects in the scene?
>
>Neither.  It stores them as points in a 3 dimensional lookup structure 
>independent of any objects in the scene but also independent of viewing
>angle.  In Jensen's case, he uses a kd-tree.  Actually, Jensen has at
>least three papers that apply to photon mapping.  All but his SIGGRAPH
>'98 paper are on his website, and if you email him he'll send you the 
>URL for that one.
>

Photon mapping requires that surfaces are divided into finite pacthes.  This
is, in general, not possible with POV-Ray.   POV-Ray will be most compatible
with a stored version of monte-carlo.  Monte-carlo "sits" on top of a
ray-tracer, needing nothing more than to trace more rays.

------
Steve Horn

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