[Radiance-general] rtrace result varies for each calculation

[Ji Zhang]

Dear Radiance experts,

I found that the rtrace output may differ every time I execute this command,
even if the oct file and the sensor point file are the same.

The rtrace command I'm using is:

cat SENSORS.pts | rtrace -I -aa .2 -ab 8 -ad 1024 -as 512 -h -w -oov
scene.oct | rcalc -e '$1=$1;$2=$2;$3=$3;$4=179*(.265*$4+.670*$5+.065*$6)' >
RESUTLS_lx.dat


in which:
1) "SENSORS.pts" describes the sensors' xyz coordinates and xyz vector,
2) "scene.oct" describes the geometry, material, and environment and sky
conditions (overcast sky with zenith radiance value set at 22.86)
3) "RESULTS_lx.dat" is expected to contain the xyz coordinates and
illuminance value of each sensor point.

However, I found that the output values in the RESULTS_lx.dat file varies
each time I execute this rtrace command in the Terminal in Ubuntu 10.04.

Is it normal? or is there anything wrong with my rtrace command parameters?

Hope you can help me on this!

Thanks!

Ji
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