[Radiance-general] Re: rtrace for luminance values

[John An]

Thank Raphael,

I had always simply taken illuminance values, so I simply thought that  
taking the -I parameter out would do the trick.  It makes much more  
sense that I would need to send the ray toward the surface I want to  
evaluate.


John



On May 3, 2004, at 6:01 AM, Raphael Compagnon wrote:
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 03 May 2004 08:57:32 +0200
> From: Raphael Compagnon <raphael.compagnon at eif.ch>
> Subject: Re: [Radiance-general] Re: rtrace for luminance values
> To: Radiance general discussion <radiance-general at radiance-online.org>
> Message-ID: <5.1.0.14.2.20040503084833.01fbf958 at pop.eif.ch>
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>
> John,
>
> Are you sure you are sending the rays in the right direction ?
>  From the two first lines of your script:
>
> cnt 6 12 1 | rcalc -e  
> '$1=51+((72/6)*$1+6);$2=96+((144/12)*$2+6);$3=30' \
> -e '$4=0;$5=0;$6=1' |  ....
> it seems you are sending rays from a regular grid in a xy plane in the
> upward direction ($6=1) !
>
> I guess you should ensure your calculation grid is located above your  
> desk
> (e.g. by setting $3=30.5) and then trace rays downwards ($6=-1). Then
> rtrace will calculate the luminance values at the rays intersections  
> with
> your desk plane which is what you expect I think...
>
> Hope this will help you.
> Raphaël Compagnon
>
>   it seems you are tracing rays
> At 01.05.2004 01:40, you wrote:
>> Thanks Mehlika for the explanation.  I was using getinfo to find the
>> exposure information, and there was nothing regarding exposure.  Can  
>> you
>> think of any other reason why this may be happening, and what I might  
>> do
>> to remedy this problem?
>>
>>
>> John
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