boolean breps

Hi friends,

Would you please help me? in attached file I have a box and a bunch of breps (red) inside the box. How can I boolean these bunch of breps (red breps) from the box? Finally there would be a box inside of which is empty of the red breps. or, If its easier to do it in Rhino, please let me know how. Thanks in advance. :)

Attachments:

boolean.PNG, 72 KB

Replies to This Discussion

Permalink Reply by djordje on October 4, 2014 at 3:23am

Hi Mohammad,

To my knowledge, it's not possible to do this in Grasshopper.

Rhino is not a solid modeller, and the solid you see, is in fact a volume enclosed by surfaces, with an empty space in between. The outside/inside part is determined by direction of your enclosing surface normals.

There's a little trick posted by Chuck, to do this in Rhino:
Run NonmanifoldMerge command, and select both the outer solid and inner one(s). Then run CreateRegions command and select the outer solid. Delete the inner solid(s).

Permalink Reply by Moh Mom on October 4, 2014 at 1:37pm

it did't work... after doing this process, I have a union volume but when I trim the object, these polysurfaces are separated. and the box is not a solid volume...

Permalink Reply by djordje on October 4, 2014 at 1:57pm

You did not mention anything about further trimming in your initial post.

Do you want to slice in half the "drilled" model you have just gotten? If that is so, use the BooleanDifference command instead of Trim command.

Permalink Reply by Moh Mom on October 4, 2014 at 2:40pm

I could'nt unfortunately... I appreciate if you could look at this file.

Permalink Reply by Moh Mom on October 4, 2014 at 2:43pm

I could'nt unfortunately... I appreciate if you could look at this file.

Attachments:

asking.3dm, 439 KB

Permalink Reply by djordje on October 4, 2014 at 3:33pm

Checked the attached file. I booleanunioned the inner red shapes firsts before running the upper mentioned 2 commands.

Attachments:

asking2.3dm, 2.3 MB

Permalink Reply by Moh Mom on October 4, 2014 at 5:22pm

Yessssss. thankssss. It is exactly what I want. Thanksssss. :)

Permalink Reply by David Rutten on October 4, 2014 at 3:34am

Rhino does not allow disjoint breps. All the faces in a brep have to be connected. Disjoint meshes are possible, but you won't be able to do this with Breps.

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