Inflate triangle surface:loft/EdgeSrf?

Hey everyone,

I am trying to create a smooth, inflated triangle surface.

I would normally do it manually in Rhino, but it would take too long so I am giving Grasshopper a go!

In Rhino I would:

-create triangle surface

-draw arc from vertex A to middle point on opposite side

-Loft first surface edge/arc/second surface edge

The result is a very smooth surface.

I am trying to do that in Grasshopper, but the loft command won't work.

I have also tried to connect all 3 curves into EdgeSurface, but the result is not quite as smooth as I need.

Any thoughts? Your help would be immensely appreciated!!!!!

I attach the GH file and a couple of screenshots so hopefully it's clear enough.

CHEERS!!!

Attachments:

triangles surface.gh, 12 KB
triangle surface copy.jpg, 319 KB

Replies to This Discussion

Permalink Reply by David Rutten on March 28, 2013 at 10:42am

You definitely need to use Loft as EdgeSurface will not retain continuity across the center arc.

I attached a file (hope you can open it) that creates a triangle surface using loft based on a closed polyline.

The file was saved with the internal version, but hopefully it will load fine on the latest public release.

David Rutten

david@mcneel.com

Poprad, Slovakia

Attachments:

PolylineToInflatedTriangle.gh, 14 KB

Permalink Reply by Ben Fitzgerald on March 28, 2013 at 10:49am

David,

Thank you so much for your reply!

Unfortunately I don't seem to be able to open the file you sent, could you save it as a different version maybe? Thanks a lot!!

Permalink Reply by Vicente Soler on March 28, 2013 at 11:05am

I can open it and we should have the same version. Close the popup window that says there are some errors, the canvas should have the components there.

Permalink Reply by Ben Fitzgerald on March 28, 2013 at 11:12am

I still can't open it, this is what pops up:

Attachments:

Error.JPG, 139 KB

Permalink Reply by David Rutten on March 28, 2013 at 11:34am

And what version do you have?

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by Ben Fitzgerald on March 28, 2013 at 12:42pm

David,

I work on Rhino 4.0 , any chance to open your file?I am sure it would be super helpful! :)

Attachments:

gh.JPG, 33 KB

Permalink Reply by Vicente Soler on March 28, 2013 at 1:08pm

That's not the latest public release of grasshopper. You can find the latest one on the 'download' section.

Permalink Reply by David Rutten on March 28, 2013 at 1:14pm

Oh dear. 0.8.0066 is indeed quite old. You can download 0.9.0014 from this page, or if you don't have Rhino5, you can get the latest installer that works on Rhino4 directly from our servers.

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by Ben Fitzgerald on March 28, 2013 at 3:21pm

Hey David/ Vicente,

thank you for your reply, I have now downloaded the latest version of GH. I have tried your script but it doesn't work well on my model because it works with polylines and not surface curves.

-I have 3 curves in Grasshopper (first surface edge/ arc/ second surface edge)

- when I plug them into the Loft I get the following runtime errors:

1)Loft failed. Don't know why.

2)Insufficient valid profile curves.

So the loft is not working.

I thought it was going to be pretty much the same process as Rhino, but I'm new to Grasshopper so any help would be really appreciated!!

I attach a sample surface from my Rhino file and my GH script.

How do you think I could make it work?

Thank you so much!!! :)

Attachments:

triangle surface.3dm, 630 KB
triangles surface.gh, 11 KB

Permalink Reply by Vicente Soler on March 28, 2013 at 3:54pm

That definition... the goggles do nothing.

See the attached file. I applied David definition to your surfaces. I also tried to make the arcs go as horizontal as possible to follow the pattern. You might have to flip some surfaces.

Attachments:

trianglessurface_02.gh, 6 KB

Permalink Reply by Ben Fitzgerald on March 28, 2013 at 4:14pm

Vicente,

Thank you SO MUCH for your help, it' s definitely working better now!! I will play around a bit with the value of the amplitude on some of the surfaces.

Again, thanks a lot, you're a star!!!

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