[Radiance-general] Sun Matrix by gendaymtx and genskyvec

Fri Dec 15 17:48:28 PST 2017

I have actually done what Greg is mentioning ... write the header of the
WEA file, and the time and radiation data of the time you want to evaluate.
Then , gendaymtx -5 0.533 -d file.wea

On Fri, 15 Dec 2017 at 10:29 PM, Greg Ward <gregoryjward at gmail.com> wrote:

> Hi Tommy,
>
> Looks like no one responded to your question.  I'm not sure what the
> correct response is, as the 5-phase method only applies to annual
> calculations.  There is a "-d" option to genskyvec that outputs zero values
> except for the sun, but that sun is spread over 3 adjacent patches, which
> is what the "-5" option in genskymtx avoids.
>
> If you really want to reproduce the 5-phase calculation at a single time
> point for some reason, why don't you edit the input file to gendaymtx to
> contain only that time point?  You can run the rest of the calculation as
> you would for an annual simulation, I think.
>
> -Greg
>
> *From: *"WEI, Minchen [BSE]" <minchen.wei at polyu.edu.hk>
>
> *Date: *December 9, 2017 5:20:15 AM PST
>
>
> When we are generating the sun matrix for the Five Phase and the improved
> version of the Daylight Coefficient Method, gendaymtx is used in Sarith’s
> tutorial file. “-5 0.533” is used.
>
>
>
> Is there a simply way to generate the sun matrix by using genskyvec? Or it
> can only be applied to gendaymtx.
>
>
>
> Thanks,
>
>
>
> Tommy
>
>
>
> --
>
> *Minchen (Tommy) Wei, PhD*
>
> The Hong Kong Polytechnic University
>
> (+852)-3400 3606 minchen.wei at polyu.edu.hk
>
>
>
> *From:* Sarith Subramaniam [mailto:sarith at psu.edu]
> *Sent:* Friday, 8 December 2017 10:30 PM
> *To:* Radiance general discussion <radiance-general at radiance-online.org>
> *Subject:* Re: [Radiance-general] Proxy geometry in the five-phase method
>
>
>
> The Daylight Coefficient
> <https://secure-web.cisco.com/1pwYjyfECioNK-IZQaYHpYgDxyRRo3ITTQENkig9kw9FqwwwoGID5yJvJblMF7FQyMit0WXP1sTUitPEnogxEjc3xzg9NbBXYRy3Eax2Wakgp_fKK8ZCnJXMoKuzRC_sD4pLcpHHR7eJuAjrz-atS0rh5VBmJEaYmIGDvrVH8Jo79nJVm-RoVLjUwuzXYdiwAAZkF87jVOgbZBXF84wHsjxKQG3nUcncH1r5hpYxjmOzJJDXixSActuGLeS5TJtiqDYEe7gJ85UG1IC_OZCBOkEGy6BP62_XuMZ2KKKLv4j2oJtBTealeeJY0Mqm5r8iZSkTIbAZrch-r1oMVrHmIDw/https%3A%2F%2Fgithub.com%2Fsariths%2FradTutorialFiles%2Fblob%2Fmaster%2Froom%2Fcommands%2F2PM_DayCoeff.sh>
> and Three Phase
> <https://secure-web.cisco.com/1pg-R4oOYN4qlA761yn7HPpJWzLn3gegHd_POgv3d0Hl-0JNc-BK8pUBYDTCovjPbt7jL-iGI8eNFG1ie0kw_MQ14rNpbY5HsxncH22y5BIegt88ldTO5S-IQBoGPE_zAOTRt5TdavMrv9ZZLr-plninhT3X4KSRgx1z7KA2FaO8zq95Zgv39tOd3WjLLWw9y6luhxyUapY6pfx1SygiAYvwjUGEm2y9zL9NbbtXWasKQNyVoAc7iDrxicBiBq0fkmf2ulEMKpST-Op5flumenYU6bWixeNg_WBrycyUY2iLIWxxgC1uIsOY4xqU2d3Y2W4B29h6E1Awkh9dWOxatPg/https%3A%2F%2Fgithub.com%2Fsariths%2FradTutorialFiles%2Fblob%2Fmaster%2Froom%2Fcommands%2F3PM.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://secure-web.cisco.com/1SNL9QyudvsTuPYlvdt43A-qZ-KyPbGAMRel-zsVPigX2xs0xTsUDTx4nI2B6G06mVrqN-QzggC_x7XNNfyvajji_t0F12h_Noame6kt22SXDNic6wm5Z9mJ4JA5oRmlZ7RbCtjcPxxj9Gm8DDeJt0Tyyy4N1NQbMUWcEIInbGalU2ZNsl173OiO2Jy5WN3iUs4x8mgKo0B3N49dLyN8wuZtHauvgsFuEjm6ZQt9nqFQoGQ4xXYf0xBAWSJqc_fY_Bk3fhPqlJGvW_4LPPIPTHSaP2hUqrLMsaFeRUIVvynugVo74pzbgrWUHC48kjVP-m7_On6Pn-VvkgpG2CSjS_w/https%3A%2F%2Fgithub.com%2Fsariths%2FradTutorialFiles%2Fblob%2Fmaster%2Froom%2Fcommands%2F5PM.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://secure-web.cisco.com/1a7v6ZRWjq_BRXwSGqIym1laBFwj3hqTl4x-klnmLNrzFlzKsCyFB6Tboy01hi9ZHHTT47P4icbSAo7UXpg6lF8R3-OVA9H2eST0wOgH5kmcFJj2bxBkMDgpe7C9mSuMVYYW6FBL2q-lo-BDiTz298QQLsuk78mGpG_4FSri5uKUAUP1GJ9KDTsK_94d12mwzIQnPaXyso39c4vmZNiLpJbQUZgVL_CbMWLQC-fDNlqy1UtIlnfVKSydM9aeVooR00Xyh4nNfgRVnDhUHATPhqpUblt_9M-LbWBOsmQy7EsfTR5sN2aDrKBrZ9D829zIlp58waJIVdLNU_sCoN81TDQ/https%3A%2F%2Fgithub.com%2Fsariths%2FradTutorialFiles%2Fblob%2Fmaster%2Froom%2Fcommands%2F2PM_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://secure-web.cisco.com/1O7rB4s36mYQNrGEqpoXIPPoj3auC2BVqX_7ft-8OdRq59B1w6l8gNJHazbAyuX-oX8W1dlL3t33RIg4XX0dgXso5HYV-Md28oE1uNnZHOdSLfMBsYnc9OsI9vgIlKaB9YbWM94A-0QBUjSn98z4yj9T2FdzN0g9xrF7xiUDSZ8_8WRs-8Cl5p8y56Rt9dD9UAb2J2ptR3fgoMYGOY6DauNxOe5eSo0H0Gs54FjD5XlbDumSNO3_rVn6sLjW0DDdvgWxn7_UKYG8ga9lZO5GlxeTgsWoPYKGhNRClAu4j3YGpDAbuKr1fNQ-EBkUciCj4/https%3A%2F%2Fwww.radiance-online.org%2Flearning%2Ftutorials%2FTutorial-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://secure-web.cisco.com/1wRAmRRitS0eb6bxNSu02bADJMEHfIbrSNyUsDF_HBK4mL-o5lOOGPt2ViV12wI2YrhdR5hVjk0v6SqEoSN56-C13TIEn13LbJS1BCcE5wfSiLvhysFOW33TN9i71-l3hWkJQxz5aXMZqYO0mb7l8bI8usVKf5tuWMe70hCvq_0s8wqSmPVoYs0XJuY_3ve8vP5xMweezH507pTBy-4tqzLbAUO02RLjd_ZKstkz_sXJxolPIzNky23KmKUL5Wv59s2GzJBChlBs9XKghA7l2CEXDC2FJlJugnua1wJwi-OxDu6WHwniVxpvP2kszs4F84cFmsmJw3abiGoWcf0htCQ/https%3A%2F%2Fgithub.com%2Fsariths%2FradTutorialFiles%2Fblob%2Fmaster%2Froom%2Fcommands%2F2PM_DDS.sh%23L55-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
>
>
>
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