Beginner question - how to extrude a surface without creating internal faces?

Hello,

I'm just getting familiar with Grasshopper, and having a great time. I have run into one roadblock around extruding flat surfaces that I hope someone can help me with.

I've created a pretty basic surface (please see the first attached image)

So far, so good.

However, when I extrude that flat surface, I end up with a bunch of internal faces (please see the second attached image)

How can I set up an extrude that works correctly - that does not create internal faces?

Thank you in advance for your help!

Replies to This Discussion

Permalink Reply by Elliot Blanchard on October 2, 2012 at 10:44am

Michael - I'd love to take a look at the definition to your modification to my example if you're comfortable sharing it.

Thanks again,

Elliot

Permalink Reply by Michael Pryor on October 2, 2012 at 10:48am

just copy it, its only 5 components added to the end of yours.

brep component> area> cull duplicates> list item> brep join.

Permalink Reply by Elliot Blanchard on October 2, 2012 at 11:26am

Hi Michael,

Got it working - thanks for your help! I think what was happening, at least on my end, was that the default tolerance for the cull - 0.1 - wasn't enough to get those interior faces. I had to put a slider on the cull tolerance to get it high enough to eliminate the interior faces, but not so high that it started killing faces that were needed.

Thanks again,

Elliot

Permalink Reply by Thomas J. Mrokon on October 1, 2012 at 2:01am