[Radiance-general] Re: rtrace for luminance values

[Raphael Compagnon]

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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