[Radiance-general] rtrace

[Jia Hu]

Please ignore my previous post. I click the wrong button.

On Wed, Jul 14, 2010 at 3:12 PM, Jia Hu <hujia06 at gmail.com> wrote:

> Thanks for reminding. As Parellel process does not work if only one point
> is considered?
>
>  On Wed, Jul 14, 2010 at 1:38 PM, Lars O. Grobe <grobe at gmx.net> wrote:
>
>>  Hi!
>>
>>
>> For the same scene with different sky conditions (diffuse and direct
>>> irradation), if I calculate illuminance at only one point under each
>>> sky condition, the ambient file seems not to be necessary for
>>> parellel processing because the caching values are different for each
>>> processor under different sky condition, It is no need to share the
>>> ambient caching, is that right? By the way, should I just specify a
>>> name of ambient file at the beginning ? The program will create the
>>> ambient with the specified name automatically ?
>>>
>>
>> The amb-file will be created, but you must make sure to delete it if you
>> change the scene or the settings used by rtrace so that the ambient
>> calculation is started from scratch with valid data reflecting those
>> changes.
>>
>> If you calculate only one illuminance value per sky condition, the ambient
>> file does not help at all. However according to what you wrote earlier I
>> would rethink the idea to take only one reading. You mentioned having
>> blinds. If the sensor is hit by the sun, it will give readings several
>> magnitudes higher then a sensor just some centimeters aside, as blinds would
>> typically cast very distinct shadows. You would not find this in you single
>> reading. To detect such cases, it may be useful to have a grid of sensors
>> instead and, beside the illuminance, monitor also the deviation of all the
>> sensors at the same sky condition as an indicator of how representive you
>> sensor reading is.
>>
>> Cheers, Lars.
>>
>>
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>>
>>
>
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