Split brep issues

Hi guys,

There is a problem about splitting brep with cutting shape which you can see below, also attached with a gh file. Is it the shape that makes errors, because there is no mistake as I use other shape. Or, is there anything else that could be used to make a closed brep with this shape and bottom surface?

Thank you in advance.

Xiaojian

Attachments:

Split Volume.gh, 695 KB

Replies to This Discussion

Permalink Reply by Joseph Oster on January 16, 2017 at 12:25pm

There is a gap between your inner brep and the outer one that prevents the split from succeeding. You can see it using 'BBX', which returns the intersection curve:

Permalink Reply by Bi Xiaojian on January 16, 2017 at 7:03pm

Hi Joseph,

Wow, that's really where problem comes from. Thank you very much. But how to solve it to make a splitted volume? Could you please give me a hand?

Xiaojian

Permalink Reply by Joseph Oster on January 16, 2017 at 7:35pm

There is no indication in your code as to how that splitting surface was created? You just have to make it "better", so that the 'BBX' curve is complete - meaning that the surface must cut all the way through the outer brep. In general, having the perimeter of your cutting surface be identical (in top view) with the brep you want to split is not a great idea. It may work in the best of circumstances but with an irregular surface like you have, it can easily fail, as you can see. It can be greater in size but never less than what you want to split. Good luck.

P.S. Folds in the cutting surface may cause problems as well. In general, geometry needs to be "clean" to get good intersections.

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