> Dear all,
>
> I'm using povray to model the focusing and retro-reflection of glass
> microspheres, so a pretty simple set up really. The problem that I am having is
> that the areas where the photon density is high and the situations where the
> spheres are re-imaging the light source at the camera (i.e the plane is near the
> focal point of the shperical lens and the camera and light source are on the
> same axis) the image saturates completely.
>
> Two questions. 1./ Can the levels of the image be scaled to use the high
> brightness areas from the photon regions?
>
> 2./ Are there any programs to extract the data from the photon map for analysis
> elsewhere?
>

The saturation comes from the clipping when the intensity becomes to 
great to be represented in the used image format.

If you use version 3.6, it's possible to add a darkening filter in front 
of the camera. A simple thin box with a gray filtering pigment. Be sure 
to set it with photons{collect off} as you don't want any photon showing 
on it.

You can also reduce the strenght of the light_source.

If you use version 3.7, you can output the image in a high dynamic range 
format.


For the point 2, I don't know of any.


Alain

Post a reply to this message