how to get the boundray volume of a groun of breqs not fully enclosed?

Replies to This Discussion

Permalink Reply by Grasshope on October 15, 2016 at 11:22pm

suggestions and advice are greatly appreciated!

Thanks!

Permalink Reply by Hyungsoo Kim on October 15, 2016 at 11:41pm

Hi.

It's not a global solution, but your mesh faces are well arranged in order, so...

Attachments:

• envelopesurface_re.gh, 8 KB

Permalink Reply by Grasshope on October 16, 2016 at 12:33am

Thank you very much, Kim, for your illuminating suggestion!

My limited understanding is that your approach will "group" the meshes into subgroups corresponding to each of the building part, and then converts each group of meshes into brep surfaces.

I have the following questions, if I may:

1. what is the purpose of "shifting" the indices of the tree path by "-1"?

2. as to the capped brep surfaces, we still have overlapping surfaces inside the building volumes, (see images below), and I'm unable to merge them using the solid union component. May I ask how to get rid of these surfaces so that we can get the ultimate "external envelopes" of the building volume using the boundary volume component?

Thank you very much, again!

Attachments:

• envelopesurface_re_2.gh, 9 KB

Permalink Reply by Hyungsoo Kim on October 16, 2016 at 12:59am

If you want to merge all breps which are touching each other, then you can do as the following.

And regarding "Shift Paths", you can check the data tree structure using "Param Viewer".

Attachments:

• envelopesurface_reV2.gh, 11 KB

Permalink Reply by Grasshope on October 16, 2016 at 2:49am

Thank you very much, Kim!

I imported another group of meshes, and it seems I can get the bottom of the buildings sealed. However, I'm still unable to

1. merge overlapping and coplanar breps, and surfaces are missing by this step

2. get the overall boundary surfaces of the building volume, and only one building is left ...

And some of the breps "closed" and some are "open", and I don't know what the difference is between them.

Hope you can kindly advise!

Thanks!

Attachments:

• envelopesurface_reV3.gh, 34 KB

Permalink Reply by Hyungsoo Kim on October 16, 2016 at 4:33am

Check attached.

Attachments:

• envelopesurface_reV4.gh, 35 KB

Permalink Reply by Grasshope on October 16, 2016 at 5:26am

THank you very much, Kim!

However, I'm unable to get the results as shown by you using your demo file. I only open it and didn't change anything.

There are buildings missing by the step of joining brep. I got a warning on the cap component, too.

Hope you can advise!

Thank you!

Permalink Reply by Grasshope on October 16, 2016 at 7:02am

Dear Kim,

Somehow, I'm unable to apply the same workflow for one of the mesh group as shown below. I'm not sure what is causing the problem.

Hope you can kindly advise.

Thank you!

Attachments:

• import_dxf_to_envelope_v005.gh, 136 KB

Permalink Reply by Hyungsoo Kim on October 16, 2016 at 7:51am

Hey,

Here is another try. And please do not expect the global solution of your problem. Because you cannot guarantee the quality of your referenced mesh data.

Unfortunately, there is one invalid brep(index-2) has generated. there is probably a small gap(naked edge) on the roof of it.

After baking them, try to fix it manually. Best.

Attachments:

• envelopesurface_reV5.gh, 41 KB