Different results analysis grid-camera views with Radiance

[moanareynau]

Hi,
Has anyone experienced an inconsistency on the results of illuminance results on the analysis grid vs camera view when using the radiance export? I placed the analysis grid very close to the floor and use the export/import calculation with radiance, then I compared the results from camera views on the same zone and the lighting levels on the floor are off by 100 lux...

Thanks,

Moana Edited by: moanareynau on May 23, 2009 12:02 AM

[yunpeng]

The default ambient parameters of camera and grid are not same, the former is less accurate than the latter, this is because the rendered camera image is mainly used in viewing than grid.
For example:
Camera: -ab 2, -aa 0.2, -ad 400, -ar 15, -as 64
Grid: -ab 8 -aa 0.1, -ad 512, -ar 32, -as 256
So, Grid result is more accurate than camera.

Another possible reason is: the objective material must be fully diffuse, if not, results of camera and grid are not same in theory.