Leaking Light to inside walls.

Dear all,

I am checking illuminance on the floor by honeybee(radiance).

When I look the result, there is leaking light inside of the wall.

This model is completely closed Brep. So there should be no light inside of the wall.

Any ideas?

Attachments:

Canvas at 22;34;49.png, 170 KB

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Replies to This Discussion

Permalink Reply by Claudio on July 2, 2015 at 12:07pm

Can You post your geometry and GH definition. Or an image

Permalink Reply by Claudio on July 2, 2015 at 12:08pm

Also check your Normals they should be pointing outwards

Permalink Reply by Chris Mackey on July 5, 2015 at 11:15am

Ryosuke,

I am having some trouble understanding what exactly your issue is. From what I can tell, i looks like you are running an image-based simulation without a ceiling to your room. My guess is that you probably want to run a grid-based simulation with a ceiling.

-Chris

Permalink Reply by Mostapha Sadeghipour Roudsari on July 6, 2015 at 5:53pm

Hi Ryosuke, What are the radiance parameters in your scene? If you are not sure how to set the parameters use Honeybee's RadiancePar component and set the quality to medium or high.

Permalink Reply by Ryosuke Maruyama on July 17, 2015 at 1:14am

Thank you for your reply. This　is the file.

Attachments:

150716_test.gh, 428 KB
150717_test.3dm, 986 KB

Permalink Reply by Theodoros Galanos on July 18, 2015 at 9:04pm

Hi Ryoshuke,

I believe I've encountered light leaking in some simulationd due to Rhino tolerance. Sometimes tolerance settings were not correct and my joined surfaces were not considered joined. You can try playing around with that.

The other reasons were pretty much covered by Mostapha and Chris. Usually you want AB (the ambient bounces) to be greater or equal to 5 no matter the quality, as it is one of the most important variables for a dependable simulation. Of course it depends on the nature of your geometry but 5 min. is a safe bet.

Btw, I couldn't see which geometry you are plugging where as one pipeline was empty in the file you posted when I opened it. Could it be that you forgot a surface?

Another point is the unit range you are using. Is that really 10 lux as maximum in your picture? Because in that case it makes sense for everything to be yellow (inside and outside) as you most likely will have more than 10 lux everywhere.

P.S.: Selecting medium/high quality sets all the variables for you, no need for additional sliders. In your case you are actually overwriting the quality settings.

Kind regards,

Theodore.

Permalink Reply by Ryosuke Maruyama on July 21, 2015 at 9:37am

Hi Theodoros Galanos,

Thanks! I gonna play with these tips form you.

I uploaded modified file on this post.

Attachments:

150716_test.gh, 428 KB
150721_test.3dm, 807 KB

Permalink Reply by Ryosuke Maruyama on July 23, 2015 at 7:18am

>Another point is the unit range you are using. Is that really 10 lux as maximum in your picture? >Because in that case it makes sense for everything to be yellow (inside and outside) as you >most likely will have more than 10 lux everywhere.

Yes, it was 10 lux as maximum. If no light is inside wall, the wall should be displayed as black.

but the wall is quite colorful in the picture I showed. so there was leaking light.

Permalink Reply by Ryosuke Maruyama on August 26, 2015 at 9:01am

any ideas?

Permalink Reply by Chris Mackey on September 7, 2015 at 10:24am

Ryosuke,

I have been playing around with the file that you uploaded but I cannot figure out what you want us to see in it. If you are using an image-base simulation and you are slicing your model open with a section, you are going to get light coming through the slice.

If you use a grid-based simulation like the attached file, you see that you get 0 illuminance inside a completely sealed box.

-Chris

Attachments:

150716_test_CWM.gh, 439 KB

Permalink Reply by Ryosuke Maruyama on September 18, 2015 at 9:23am

I know I can get similar image with grid based simulation. But, I would like to use image based simulation with clipping plane option.

I found a hint.
Can we do the same way like this site?
http://climate-based-daylighting.com/doku.php?id=resources%3Aradian...

Permalink Reply by Mostapha Sadeghipour Roudsari on September 22, 2015 at 5:34pm

You can use sectionPlane input in Honeybee to achieve that. As you can see the room is pretty dark! Attached is an example.

Attachments: