Hi!

I'm trying to simulate a cameras baffle and I'm trying to figure out if I
can use POVray for this purpose.

What I'm trying to simulate is how many photons from a light source outside
the target area will hit a imaging chip.

What I need is to count the number of photons that hit a specific object. Is
there any way of getting POVray to report this data?

Best regards

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cazed wrote:
> Hi!
> 
> I'm trying to simulate a cameras baffle and I'm trying to figure out if I
> can use POVray for this purpose.
> 
> What I'm trying to simulate is how many photons from a light source outside
> the target area will hit a imaging chip.
> 
> What I need is to count the number of photons that hit a specific object. Is
> there any way of getting POVray to report this data?

Short answer: no.

Long answer:

POV-Ray uses different techniques to calculate different mechanisms of 
light transport.  Raytracing is used to  calculate the direct 
illumination, Monte-Carlo radiosity for the diffuse lighting and photon 
mapping for specular light transport.  The combination of all those 
results in the color of the pixels.

So how much light reaches a certain point in the scene can be found in 
the pixel color.  How accurate this is depends on the scene modeling and 
the parameters used.  How much light actually reaches a certain object 
on the whole is not possible to derive from this though.

Christoph

-- 
POV-Ray tutorials, include files, Sim-POV,
HCR-Edit and more: http://www.tu-bs.de/~y0013390/
Last updated 03 May. 2005 _____./\/^>_*_<^\/\.______

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Thanks for the response, I might be able to use it since no exact data is
required. I should be able to compare one model to another...maybe. I'll
have to do some tests.



Christoph Hormann <chr### [at] gmxde> wrote:
> cazed wrote:
> > Hi!
> >
> > I'm trying to simulate a cameras baffle and I'm trying to figure out if I
> > can use POVray for this purpose.
> >
> > What I'm trying to simulate is how many photons from a light source outside
> > the target area will hit a imaging chip.
> >
> > What I need is to count the number of photons that hit a specific object. Is
> > there any way of getting POVray to report this data?
>
> Short answer: no.
>
> Long answer:
>
> POV-Ray uses different techniques to calculate different mechanisms of
> light transport.  Raytracing is used to  calculate the direct
> illumination, Monte-Carlo radiosity for the diffuse lighting and photon
> mapping for specular light transport.  The combination of all those
> results in the color of the pixels.
>
> So how much light reaches a certain point in the scene can be found in
> the pixel color.  How accurate this is depends on the scene modeling and
> the parameters used.  How much light actually reaches a certain object
> on the whole is not possible to derive from this though.
>
> Christoph
>
> --
> POV-Ray tutorials, include files, Sim-POV,
> HCR-Edit and more: http://www.tu-bs.de/~y0013390/
> Last updated 03 May. 2005 _____.//^>_*_<^/.______

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