On 28/05/2011 01:07, Alain wrote:

>> 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


Thanks Alain, I'll get version 3.7 and try the hdr options

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