[Radiance-general] genklemsamp - surface orientation

[Jack de Valpine]

Hi Greg and All,

In brief follow-up to this, I want to sanity check myself. For the 3 
phase method:

  * vmx - for rcontrib klems_int.cal needs the normal from the glazing
    surface pointing to the interior, eg <0,1,0> for a south facing window
  * dmx - for genklemsamp the view direction is the normal direction
    pointing outside, the opposite of what is used for vmx, eg <0,-1,0>
    for a south facing window

Lastly, as long as a glazing surface is not facing straight up, that is 
a skylight parallel to the ground plane, then then an up direction of 
<0,0,1> can be used.

Thanks,

-Jack

-- 
Jack de Valpine
President

Visarc Incorporated
www.visarc.com

channeling technology for superior design and construction

On 3/29/2013 6:15 PM, Greg Ward wrote:
> Hi Jack,
>
> The view defaults for genklemsamp are the same as the rendering 
> programs, except that it assumes a parallel view (-vtl).  The view up 
> vector will be +Z unless you specify otherwise.  So long as it isn't 
> parallel to your view direction, as in the case of a horizontal 
> skylight, you don't need to specify it.
>
> You will need to specify the interior normal direction using the 
> kbin() function defined in klems_int.cal for your "view matrix" 
> calculation.  Just make sure these agree with what you give to 
> genklemsamp.
>
> Cheers,
> -Greg
>
>> *From: *Jack de Valpine <jedev at visarc.com <mailto:jedev at visarc.com>>
>>
>> *Date: *March 29, 2013 2:06:33 PM PDT
>>
>> *
>> *
>>
>> Hi all,
>>
>> I am trying to figure sampling window geometry where the normal is 
>> not parallel to the ground plane. So a sloped skylight for example. 
>> If I am passing the geometry for the glazing to genklemsamp, is all I 
>> need in addition, the normal for the surface? For example:
>>
>>     genklemsamp -vd 1 0 1 sloped_window.rad > samples.dat
>>
>> or do I need to specify view up?
>>
>> Thanks,
>>
>> -Jack
>> -- 
>> Jack de Valpine
>> President
>>
>> Visarc Incorporated
>> www.visarc.com
>>
>> channeling technology for superior design and construction
>
>
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