[Radiance-general] Problem with refraction in Dielectric material

[Thomas Bleicher]

Hi Francesco.

A couple of comments:

If I understand correctly you are trying to render an image of a beam of
light passing through
a dielectric material. If you try to create an image you should use the
rpict program and not
the 'rtrace' command line you used.

You mention that you don't understand the results but you don't show us what
they are.
The output of your command line should give you lux values but I don't know
how the
input relates to the geometry (haven't looked at it close enough).

Your scene description below is incomplete. There are some '0's missing in
the descriptions.
I hope that is an effect of copy-and-paste. Otherwise I doubt that the
simulation would run
at all.

Do you know about the docs in

http://radsite.lbl.gov/radiance/refer

in particular

http://radsite.lbl.gov/radiance/refer/materials.pdf


Regards
Thomas


On Thu, Aug 20, 2009 at 1:58 PM, <francesco.frontini at polimi.it> wrote:

> Dear all,
> I am running a simulation test to asses if Radiance calculates correctly
> the refraction inside a dielectric material. (Snell law  n1*sin(A1) =
> n2sin(A2) ).
>
>
> I build up two identical geometry one with a dielectric pane and the second
> without. The direct light can pass through a gap between two plastic
> surfaces.
>
>
> Using just direct calculation (sun) I should have two identical bright
> stripes in dimension but the one passing through the dielectric panel should
> be shifted due to the refraction in the dielectric pane.
>
> I copy and paste down the geometry and the material definition.
>
> I am running the following command:
>
> cat  sensor.grd  |rtrace -h -I -ab 0  test-1.oct  | rcalc -e
> '$1=47.4*$1+120*$2+11.6*$3'  > test-1-sensor1.out
>
> the file sensor.grd is the list of my sensor:
>
> X Y Z  0 0 1
>
> where:
>
> "X" is 2500 (for the case of the dielectric panel) or 7500 (for the case
> without the dielectric panel)
>
> "Y" is changing between 10 and 5000 (with a step of 0.1)
>
> "Z" is 0.01
>
> the simulation results are not clear to me.
>
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