[Radiance-general] Orientation of glazing in three-phase method

[WEI, Minchen [BSE]]

Dear all,

A question regarding the orientation of glazing in three- and five-phase calc.

When calculating the view matrix, I know the glazing aperture should facing towards the interior. Should I flip the orientation of the glazing aperture towards the exterior when calculating the daylight matrix? I see the Matrix-based tutorial did not do that, but an answer to a past question in the mailist said "yes".

Thanks,

Tommy

--
Minchen (Tommy) Wei, PhD
The Hong Kong Polytechnic University
([phone] ***@polyu.edu.hk<mailto:***@polyu.edu.hk>

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[Greg Ward]

I do not believe that you should flip the window orientation in the 5-phase method.

-Greg

Date: March 24, 2018 6:11:24 AM PDT
Dear all,
A question regarding the orientation of glazing in three- and five-phase calc.
When calculating the view matrix, I know the glazing aperture should facing towards the interior. Should I flip the orientation of the glazing aperture towards the exterior when calculating the daylight matrix? I see the Matrix-based tutorial did not do that, but an answer to a past question in the mailist said “yes”.
Thanks,
Tommy
--
Minchen (Tommy) Wei, PhD
The Hong Kong Polytechnic University

[David Geisler-Moroder]

Dear Minchen,

as a follow-up on that - you should definitely not flip the surface if you
are using rfluxmtx to calculate your matrices. Quoting from the manpage:
"Rays always emanate from the back side of the sender surface and arrive at
the front side of receiver surfaces. In this way, a receiver surface may be
reused as a sender in a subsequent rfluxmtx calculation and the resulting
matrices will concatenate properly."

Best,
David

Post by Greg Ward
I do not believe that you should flip the window orientation in the 5-phase method.
-Greg
*Date: *March 24, 2018 6:11:24 AM PDT
Dear all,
A question regarding the orientation of glazing in three- and five-phase calc.
When calculating the view matrix, I know the glazing aperture should
facing towards the interior. Should I flip the orientation of the glazing
aperture towards the exterior when calculating the daylight matrix? I see
the Matrix-based tutorial did not do that, but an answer to a past question
in the mailist said “yes”.
Thanks,
Tommy
--
*Minchen (Tommy) Wei, PhD*
The Hong Kong Polytechnic University
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