Working with non rectilinear surface

Hi, I need advice about now to handle the surface in image above which was constructed by lofting two closed curves (the outside perimeter and the inner perimeter).

For context, this is a floor slab which I want to develop with diagrids or other surface transformations.

My problem is that I can't evaluate the surface in anyway (I assume the u,v system for evaluating surfaces can't be applied to this non -rectilinear surface). BRep components return a 'null surface' message.

What basic principal am I missing? Can anyone advise me how I can handle this geometry? It is important that I be able to retain control of the edges of this surface as they are show above, as well as evaluate and modify the surface itself.

Thanks for any help.

Best Regards, Matthew

Replies to This Discussion

Permalink Reply by Pieter Segeren on April 2, 2011 at 1:23pm

Hi Matthew, I don't get the goal completely, and I'm just thinking out loud here, but would it help to explode your loft output?

Permalink Reply by Matthew Schexnyder on April 2, 2011 at 2:20pm

Hi Pieter, I will try your suggestion. I have attached my working solution since my last post which seems to be working for me. It is based on a curve projection and a surface split (a GH pro could probably find a much easier way). Thanks for your reply! Matthew

Permalink Reply by Pieter Segeren on April 2, 2011 at 3:06pm

Could you upload your definition?

Permalink Reply by Matthew Schexnyder on April 2, 2011 at 3:18pm

def attached

Attachments:

GH-slab defs_wrk.ghx, 497 KB

Permalink Reply by Pieter Segeren on April 2, 2011 at 3:51pm

And your funky slab 3dm please;)

Permalink Reply by Matthew Schexnyder on April 2, 2011 at 4:32pm

Yes. Sorry about that. File attached. The smaller (inner) closed curve is the projection curve, the larger (outer) curve is the base surface.

-Matthew

Attachments:

Platform(s)_crvs_origin.3dm, 30 KB

Permalink Reply by Pieter Segeren on April 3, 2011 at 1:48pm

Hi Matthew, I finally got around to having a closer look. Is it the solution your were after? Did you manage to put on a diagrid? All I could do was abbreviate your definition a bit.

Permalink Reply by Matthew Schexnyder on April 3, 2011 at 2:28pm

Hi Pieter, Well I really have not found the solution yet. I posted another update earlier this afternoon (http://www.grasshopper3d.com/forum/topics/working-with-non-rectilin...). If you are interested, you can see where I am at now and perhaps offer some advice.

Thanks for your help so far!

-Matthew

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