light leakage problem

hii everyone,

It seems i have light leakage problem in my model, can ne1 tel m …hw can I fix it…?
Is thr ne odr option except reconstructing model…? I have done my Model in ecotect…

Thank you
Harshada

It seems i have light leakage problem in my model, can ne1 tel m …hw can I fix it…?
Is thr ne odr option except reconstructing model…? I have done my Model in ecotect…

Do you expect anyone to solve this for you if you ask in a general way like this? The question is not about radiance but about modelling in ecotect. Most probably it is not a problem of the software. We do not know / see the problem. A "light leakage" can be anything from a missing ceiling to a rounding error...

CU Lars.

hii everyone,

It seems i have light leakage problem in my model, can ne1 tel m …hw can I fix it…?

The first thing to do is to identify the source of the problem. Why do you
suspect 'light leakage'? To high values for daylight factor?

First check your material definitions. If you have windows and your glass
material is incorrect too much light might enter the room through the
window panes.

If you think that the geometry is the problem try a few fisheye views of the
inside. Bright pools at the edges of walls/ceilings/etc. indicate a problem.
If the inside doesn't show anything, place a light source inside and render
views from the outside without sky.

Is thr ne odr option except reconstructing model..? I have done my Model in ecotect....

There is no point in recreating a model if you don't know what was wrong
with the first one.

Please also post your questions in proper English and provide as much
information as you can. If you want us to take the time for meaningful
replies you should take the time to type an understandable question.

Regards,
Thomas

···

On 22 Jul 2008, at 05:57, EncaseIndia wrote:

Hi Thomas,

Thanks for the feedback.
I was actually checking my model in radiance without any windows,wherein it showed me light leakage.Its just one corner of the building at which i can see some light ,which is around 250 lux, quite huge amount.
I deleted all my windows in ecotect and then exported the model in radiance, after so much analysis i could just find the corner from where the light is leaking.
I have attached the pictures here.

and I hope you find my english proper. :slight_smile:

Harshada

···

----- Original Message -----
  From: Thomas Bleicher
  To: Radiance general discussion
  Sent: Tuesday, July 22, 2008 11:42 PM
  Subject: Re: [Radiance-general] light leakage problem

  On 22 Jul 2008, at 05:57, EncaseIndia wrote:

    hii everyone,

    It seems i have light leakage problem in my model, can ne1 tel m …hw can I fix it…?

  The first thing to do is to identify the source of the problem. Why do you
  suspect 'light leakage'? To high values for daylight factor?

  First check your material definitions. If you have windows and your glass
  material is incorrect too much light might enter the room through the
  window panes.

  If you think that the geometry is the problem try a few fisheye views of the
  inside. Bright pools at the edges of walls/ceilings/etc. indicate a problem.
  If the inside doesn't show anything, place a light source inside and render
  views from the outside without sky.

    Is thr ne odr option except reconstructing model..? I have done my Model in ecotect....

  There is no point in recreating a model if you don't know what was wrong
  with the first one.

  Please also post your questions in proper English and provide as much
  information as you can. If you want us to take the time for meaningful
  replies you should take the time to type an understandable question.

  Regards,
  Thomas

------------------------------------------------------------------------------

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  Radiance-general mailing list
  [email protected]
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Hi,

as Thomas said, check your geometry model to be sure the model is well closed, and then check the materials defination.

ZZ

HiThomas,

Thanksforthefeedback.
Iwasactuallycheckingmymodelinradiancewithoutanywindows,whereinitshowedmelightleakage.Itsjustonecornerofthebuildingatwhichicanseesomelight,whichisaround250lux,quitehugeamount.
Ideletedallmywindowsinecotectandthenexportedthemodelinradiance,aftersomuchanalysisicouldjustfindthecornerfromwherethelightisleaking.
Ihaveattachedthepictureshere.

andIhopeyoufindmyenglishproper.:slight_smile:

Harshada
-----OriginalMessage-----

···

From:ThomasBleicher
To:Radiancegeneraldiscussion
Sent:Tu esday,July22,200811:42PM
Subject:Re:[Radiance-general]lightleakageproblem

On22Jul2008,at05:57,EncaseIndiawrote:

hiieveryone,

Itseemsihavelightleakageprobleminmymodel,canne1telm…hwcanIfixit…?

Thefirstthingtodoistoidentifythesourceoftheproblem.Whydoyou
suspect’lightleakage’?Tohighvaluesfordaylightfactor?

Firstcheckyourmaterialdefinitions.Ifyouhavewindowsandyourglass
materialisincorrecttoomuchlightmightentertheroomthroughthe
windowpanes.

Ifyouthinkthatthegeometryistheproblemtryafewfisheyeviewsofthe
inside.Brightpoolsattheedgesofwalls/ceilings/etc.indicateaproblem.
Iftheinsidedoesn’tshowanything,placealightsourceinsideandrender
viewsfromtheoutsidewithoutsky.

Isthrneodroptionexceptreconstructingmodel…?IhavedonemyModelinecotect…

Thereisnopointinrecreatingamodelifyoudon’tknowwhatwaswrong
withthef irstone.

PleasealsopostyourquestionsinproperEnglishandprovideasmuch
informationasyoucan.Ifyouwantustotakethetimeformeaningful
repliesyoushouldtakethetimetotypeanunderstandablequestion.

Regards,
Thomas



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Hi Thomas,

Thanks for the feedback.
I was actually checking my model in radiance without any windows,wherein it showed me light leakage.Its just one corner of the building at which i can see some light ,which is around 250 lux, quite huge amount.
I deleted all my windows in ecotect and then exported the model in radiance, after so much analysis i could just find the corner from where the light is leaking.

Radiance can show some unwanted light spots at the edges of polygons.
This is due to inaccuracies of the geometry generation and the interpolation
between two calculated points.

I have seen this in models where I only created a single polygon for a wall
instead of two polygons for inside and outside or where the floor or ceiling
was larger than the room space itself and extended into the exterior. If your
model is of this type try to build floor, walls and ceiling with real thickness.
This will create an exterior envelope around your room that should stop most
of the light. I have no idea how you can do this in Ecotect, though.

I have attached the pictures here.

Sorry, you can't post files to the mailing list. You have to find a public
website (myspace would do) and post the link here.

and I hope you find my english proper. :slight_smile:

Yes. Keep going!

Regards,
Thomas

···

On 24 Jul 2008, at 14:25, EncaseIndia wrote:

Hi everyone,

Thanks for your feedback

yup as Kai said ,I have kinda huge model… so that can be one of the things which i need to check.
and one more thing is as Thomas said,I have modelled it without the actual material thickness.So i even have to check it with that.
Now I am just explaining what problem i have eaxactly.
I have a geometry of a building block wiith two wings ,modular. The wing from which I am getting light leakage is on east side.
So i tried copying the same geometry from west to east.
but the same geometry is perfect on west and if you place it on east it leaks light.

I know this is kinda long mail, but thanks for reading

In search of solution
Harshada

···

----- Original Message -----
  From: Thomas Bleicher
  To: Radiance general discussion
  Sent: Friday, July 25, 2008 12:04 AM
  Subject: Re: [Radiance-general] light leakage problem

  On 24 Jul 2008, at 14:25, EncaseIndia wrote:

    Hi Thomas,

    Thanks for the feedback.
    I was actually checking my model in radiance without any windows,wherein it showed me light leakage.Its just one corner of the building at which i can see some light ,which is around 250 lux, quite huge amount.
    I deleted all my windows in ecotect and then exported the model in radiance, after so much analysis i could just find the corner from where the light is leaking.

  Radiance can show some unwanted light spots at the edges of polygons.
  This is due to inaccuracies of the geometry generation and the interpolation
  between two calculated points.

  I have seen this in models where I only created a single polygon for a wall
  instead of two polygons for inside and outside or where the floor or ceiling
  was larger than the room space itself and extended into the exterior. If your
  model is of this type try to build floor, walls and ceiling with real thickness.
  This will create an exterior envelope around your room that should stop most
  of the light. I have no idea how you can do this in Ecotect, though.

    I have attached the pictures here.

  Sorry, you can't post files to the mailing list. You have to find a public
  website (myspace would do) and post the link here.

     and I hope you find my english proper. :slight_smile:

  Yes. Keep going!

  Regards,
  Thomas

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