Proxy geometry in the five-phase method

Hi All,

I have questions regarding the proxy geometry in the five-phase method.

I tried the tutorial using a room with a glazing (no venetian blinds). The daylight coefficient and three-phase method can produce similar results, but the five-phase method produce smaller illuminance values.

I think the problem is coming from the "proxy geometry". In my "proxy geometry" I only included a glazing geometry with the transmittance I used in the daylight coefficient method. Is that right?

I looked at the proxy geometry included in Sarith's tutorial which included all the blinds, the glazing, and a BSDF ("blindsT4c.xml") for maxPoly and minPoly. How should I generate these BSDF if I have the blinds?

Thanks,

Tommy

···

--
Minchen (Tommy) Wei, PhD
The Hong Kong Polytechnic University
(+852)-3400 3606 [email protected]<mailto:[email protected]>

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www.polyu.edu.hk/80anniversary<http://www.polyu.edu.hk/80anniversary>

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The Daylight Coefficient <https://github.com/sariths/radTutorialFiles/blob/master/room/commands/2PM_DayCoeff.sh> and Three Phase <https://github.com/sariths/radTutorialFiles/blob/master/room/commands/3PM.sh> examples use a sky with 145 patches in which the sun accounts for 3-4 patches. In these examples, the sky and sun are both represented through the "glow" primitive and the ray-tracing is stochastic. The additional steps in the Five Phase <https://github.com/sariths/radTutorialFiles/blob/master/room/commands/5PM.sh> example subtract out the direct component of the results from the glow-based oversized sun patches and replace them with replace them with accurately calculated direct sun-results. In this case, the sun is represented using the "light" primitive (implying a deterministic calculation) and is also more appropriately sized (0.533 degrees).

The exercise files also contain an improved version <https://github.com/sariths/radTutorialFiles/blob/master/room/commands/2PM_DDS.sh> of the Daylight Coefficient Method that features the direct-sun correction. I think the results from that calculation and the Five Phase calculation will be similar as they both involve the direct-sun correction.

The final part of the Five-Phase method requires Tensor-Tree BSDFs. The methodology for creating BSDFs from Radiance primitives is discussed in the genBSDF tutorial <https://www.radiance-online.org/learning/tutorials/Tutorial-genBSDF_v1.0.1.pdf>. If your glazing system is just a simple glazing comprised of something like "glass" or "trans", you can incorporate the glazing geometry directly. This process would be similar to what is discussed for the improved Daylight Coefficient calculation <https://github.com/sariths/radTutorialFiles/blob/master/room/commands/2PM_DDS.sh#L55-L73>.

Sarith

···

On 12/8/2017 4:11 AM, WEI, Minchen [BSE] wrote:

Hi All,

I have questions regarding the proxy geometry in the five-phase method.

I tried the tutorial using a room with a glazing (no venetian blinds). The daylight coefficient and three-phase method can produce similar results, but the five-phase method produce smaller illuminance values.

I think the problem is coming from the �proxy geometry�. In my �proxy geometry� I only included a glazing geometry with the transmittance I used in the daylight coefficient method. Is that right?

I looked at the proxy geometry included in Sarith�s tutorial which included all the blinds, the glazing, and a BSDF (�blindsT4c.xml�) for maxPoly and minPoly. How should I generate these BSDF if I have the blinds?

Thanks,

Tommy

--

*Minchen (Tommy) Wei, PhD*

The Hong Kong Polytechnic University

(+852)-3400 3606 [email protected] <mailto:[email protected]>

www.polyu.edu.hk/80anniversary <http://www.polyu.edu.hk/80anniversary>

/Disclaimer:/

/This message (including any attachments) contains confidential information intended for a specific individual and purpose. If you are not the intended recipient, you should delete this message and notify the sender and The Hong Kong Polytechnic University (the University) immediately. Any disclosure, copying, or distribution of this message, or the taking of any action based on it, is strictly prohibited and may be unlawful./

/The University specifically denies any responsibility for the accuracy or quality of information obtained through University E-mail Facilities. Any views and opinions expressed are only those of the author(s) and do not necessarily represent those of the University and the University accepts no liability whatsoever for any losses or damages incurred or caused to any party as a result of the use of such information./

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