Vaib,
There is an important difference between the -i (lower case i) and -I
(capital i) in rtrace. When -i is given, rtrace will trace a ray in the
direction given, and then will calculate the hemispherical irradiance at
the point where the ray intersects with geometry (ignoring some material
types). With the -I command it calculates the hemispherical irradiance at
the point you specify using the direction vector as a a normal for the
imaginary surface on which irradiance is calculated.
Users typically want -I, except for specialized cases. You should make
sure that -i is correct for your case.
Andy
ยทยทยท
On Mon, Apr 22, 2013 at 4:44 AM, Vaib <[email protected]> wrote:
Thanks Lars. Actually my illuminance sensor (I already used -I switch),
was spatially located on a wall, with its direction towards a window Xorg
Yorg Zorg 0 -1 0. But out of this window there was no sky glow or source
defined (neither ground); only Sun source was defined. Thats why, the
sensor was not able to trace any ray coming from that direction (0 -1 0)
using rtrace, because there was no sky. But finally I understood that and
the issue is now resolved. Also this proved to me that there is some
reverse ray tracing going on.This was my command: echo '3 4 1.5 0 -1 0' | rtrace -w -as 512 -ar 512
-aa 0.15 -ab 2 -i+ -h sunnyScene.oct | rcalc -e
'$1=($1*.265+$2*.67+$3*.065)*179'Thanks again!
Vaib
PS: If you are interested to see the geometry, and sky, I have reported
that in my university assignment. Just see the 'last page' of this report:
http://tinyurl.com/d86dbo4Best regards,
Vaibhav Jain
www.vaibhavjain.coOn 21 April 2013 23:56, Lars O. Grobe <[email protected]> wrote:
Hi Vaibhav,
it is hard to tell what caused the result, as we do not know the
parameters you used with rtrace. For the point to be interpreted as an
irradiance sensor, which seams to be what you expect, you need the -I
switch at least.Cheers, Lars.
> Hello again!
>
> By doing some parametric analysis I got my answer. Actually my so called
> photocell was facing the window, and since I had no sky distribution
> (only sun defined in my sky file), thats why in the model there was no
> sky environment (just like in outer Space). Hence the recieved
> irradiance at that location was Zero. I think I am right now.
>
> Thanks!
>
> Best regards,
> Vaibhav Jain_______________________________________________
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