[Radiance-general] Illuminance calculation on a virtual surface?

[Raphael Compagnon]

Hello Jim,

You can simply slightly change your script by specifying rtrace option -fac 
that will directly generate a Radiance picture on its output. Of course, 
you will surely have to increase the density of the calculation points 
piped to rtrace in order to have a picture with reasonable size.

Raphael Compagnon

At 27.06.2004 23:02, you wrote:
>Hi-
>
>I have been using a script with rtrace to calculate the illuminance
>values on a grid of points representing the work surface in my modeled
>room. But now I would like to generate a false-color image of the
>illuminance values on a plane .8m above the floor. I can easily do
>the floor (or walls, etc.) with a parallel projection view, but I
>don't see how to get the workplane illuminance values without creating
>an opaque surface at the correct height which would change the light
>distribution. Does anyone know of a way to specify a "virtual" surface
>or other technique to do this?
>
>Thanks,
>Jim Estes