[Radiance-general] Cropping a .pic file

[Krystyna Zelenay]

Hi Greg,

I am using DIVA for Rhino to do the renderings. It looks like the
rpict view parameters used in DIVA are the following:
-vta -vp 1275.98 31.928 229.686 -vd -17.783 -2.785 0 -vu 0 0 1 -vh 180
-vv 180 -vo 0 -va 0 -vs 0 -vl 0

DIVA outputs a pic file with a 180 degree fisheye view and I was
hoping that I could mask all but a 60 and 120 degree cone of vision
within the image so that I can calculate maximum and minimum pixel
values within these smaller views. Rectangular areas for calculating
averages would work.

Thank you,

Krystyna





On Fri, Jun 17, 2011 at 3:43 PM, Greg Ward <gregoryjward at gmail.com> wrote:
> Hi Krystyna,
>
> Can you share a few more details?  What were the exact view parameters you gave to rpict, and do you need to compute circular area averages or would rectangular areas work?
>
> This can probably be done with pcomb without needing to crop the images, but some math is required.
>
> -Greg
>
>> From: Krystyna Zelenay <kzelenay at berkeley.edu>
>> Date: June 17, 2011 3:02:45 PM PDT
>>
>> Hi,
>>
>> I am wondering if  there is a way to crop a .pic file generated using
>> rpict ? I would like to crop the .pic file so that it corresponds to
>> images with a 60 and 120 degree cone of vision to in order to
>> calculate luminance ratios for the task and surround area,
>> respectively. In other words, I was just thinking of cropping the 180
>> degree fisheye view to two smaller circles.
>>
>> Thanks,
>>
>> Krystyna
>
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