Hi,

I intend to use a raytracer to simulate an optical system using a photocell
as sensor. Is it feasible to misuse the raytracer to get  photocell output
values for defined scenes, rather than camera images? How can it be done
with Povray?

cheers,
OT

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in news:3d736db0$1@news.povray.org Oliver Tilch wrote:

> Is it feasible to misuse the raytracer to get  photocell output
> values for defined scenes, rather than camera images?

Oliver,

I'm not quite sure I understand what you want to achieve, so here's wild 
guess on what could be done.

Assuming you have an optical system that is some kind of 
imaging/projection device and the light from it falls on the photocell. 
The photocell will give a voltage depending on the amount of energy it 
receives. 
If this is what you want to simulate, you can build the whole setup in 
POV-Ray, using photons. Instead of projecting on a photocell you project 
on a white plane. Now set up the camera to only render an image of the 
plane. You can average the brightness of all the pixels in the resulting 
image, that could be something comparable with a voltage from a 
photocell.
Note that POV-Ray does not simulate realistic, absolute, light 
intensities.

Ingo

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ingo wrote:
>
> If this is what you want to simulate, you can build the whole setup in
> POV-Ray, using photons.

This way you can simulate spot wavelengths. Well, sort of. And modify
ior/transmittance/reflectance per spectral sample. Then integrate
the output using the spectral response of the photocell.


_____________
Kari Kivisalo

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Ingo,

thanks for the idea, this is what I am looking for. I am not worried about
absolute light intensities, as I just want to compare the simulated
photocell outputs for different changes in the optical system. Maybe, I have
to dig a  bit deeper into Povray theory to be prepared when I show my
results to a physician.

Cheers,
OT


"ingo" <ing### [at] homenl> schrieb im Newsbeitrag
news:Xns### [at] povrayorg...
> in news:3d736db0$1@news.povray.org Oliver Tilch wrote:
>
> > Is it feasible to misuse the raytracer to get  photocell output
> > values for defined scenes, rather than camera images?
>
> Oliver,
>
> I'm not quite sure I understand what you want to achieve, so here's wild
> guess on what could be done.
>
> Assuming you have an optical system that is some kind of
> imaging/projection device and the light from it falls on the photocell.
> The photocell will give a voltage depending on the amount of energy it
> receives.
> If this is what you want to simulate, you can build the whole setup in
> POV-Ray, using photons. Instead of projecting on a photocell you project
> on a white plane. Now set up the camera to only render an image of the
> plane. You can average the brightness of all the pixels in the resulting
> image, that could be something comparable with a voltage from a
> photocell.
> Note that POV-Ray does not simulate realistic, absolute, light
> intensities.
>
> Ingo

Post a reply to this message

Kari Kivisalo wrote:
> >
> > If this is what you want to simulate, you can build the whole setup in
> > POV-Ray, using photons.
>
> This way you can simulate spot wavelengths. Well, sort of. And modify
> ior/transmittance/reflectance per spectral sample. Then integrate
> the output using the spectral response of the photocell.

I understand, there are possibilites to incorporate the system's spectral
behaviour. This may become important in the 2nd or 3rd step of my
simulations. What do you mean by spot wavelengths?

OT

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