Double Layer Gridshell

For anyone looking at classic double layer gridshells (Mannheim, Weald and Downland etc) this set of components will be useful. There are tools to create centreline geometry (for analysis etc), lath cutting patterns, and solid geometry for modelling/visualisation.

This is relatively untested so apologies for any bugs that may exist - let me know if you find any.

Cheers

Alex

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Replies to This Discussion

Permalink Reply by Alex Baalham on November 14, 2012 at 2:24pm

I'm currently working with GH 0.8.0066 not 0.9.xx, though I don't think that's the problem here.

I notice from your 3DM that you've got the units set as meters - this can cause problems with the some of my components because they're designed to work at 'building scale' with the model units set to millimeters (there can also be problems with the Shortpath command). Setting the units to millimeters with a precision of 0.001 should solve your problems (i.e. 'Large objects - Millimeters' when creating a new file).

If this doesn't fix it, let me know and I'll take another look (I might even get round to installing 0.9.0006).

Permalink Reply by M NICK on November 15, 2012 at 10:53am

Thanks Alex, am working with GH 0.8.0066 and the unit was not the problem!

Any suggestion?

Permalink Reply by Alex Baalham on November 16, 2012 at 2:19am

When I try to open your file 'question.gh' I get error messages including 'Archive file written with newer version: 0.9.0006' so I assume it has been written with GH 0.9.006? If you have a 0.8.0066 version of your GH file could you upload this please and I'll take a look.

Permalink Reply by Alex Baalham on November 17, 2012 at 8:08am

I've just opened this up in GH 0.9.0006 with Rhino 5. There were two problems which I've fixed in the attached 'answer.gh':

(1) units - you need to use the 'Large objects - Millimeters' template. I've adjusted your initial dimensions from e.g. 21 to 21,000 as this is now mm not m.

(2) old version of Gridshell Components used - download the current version here: http://www.grasshopper3d.com/profiles/blogs/new-version-of-gridshel...

Let me know if this is working OK for you now.

Attachments:

answer.gh, 30 KB

Permalink Reply by M NICK on November 20, 2012 at 7:35pm

Thanks a lot Alex for your help.

I still have question: how can I use your Lath Centerlines component since I need to have lines at the end instead of curves!

I do really appreciate your help

Permalink Reply by Alex Baalham on November 21, 2012 at 2:49am

You don't need the Lath Centrelines component - the CP (curve points) output from the Centrelines component provides lists containing the start, intersection and end points for each curve. Pass these points to the polyline component to generate straight lines between each point. If you want individual lines, just explode the polylines.

Permalink Reply by Flavio Meireles Caffarello on June 20, 2013 at 1:32pm

Hi Alex!

I've been trying to apply the command CL with BRep and it appears a problem: says it is out of the limits of the matrix.

First I thought it was because it was a BRep and not a surface. So I tried to do a loft in Rhino and use it as a surface, but still not working.

I am sending my rhino and my grasshopper files. If you could give a look I would be very grateful.

Thanks in advance!

Attachments:

Cop. - Grav. - question.3dm, 1.7 MB
Gridshell HEX - Question.gh, 10 KB

Permalink Reply by Alex Baalham on June 22, 2013 at 12:45pm

Hi Flavio
If a curve has fewer than 2 intersections then the component gives a matrix error. It's a bug that I need to fix. If you check your model and remove any curves with one or no intersections with other curves, then it should work.
If this doesn't fix it I'll take a look at your files.
Alex

Permalink Reply by Flavio Meireles Caffarello on June 22, 2013 at 7:00pm

Hi Alex,

Thanks for your answer. I tried to take off the curve that had just one intersection, but still the same warning. Should be something really simple.. I am just not getting it. If could give a fast look, I would really appreciate that.

Thank you,
Flavio

Attachments:

Gridshell HEX Components.gh, 27 KB

Permalink Reply by Alex Baalham on June 23, 2013 at 1:46pm

Hi Flavio

The components work to a tolerance of approx 20 model units. I've scaled your model up by a factor of 1000 and it now works fine. I recommend using the 'Large Objects - Millimetres' template and keepting intersection points at least 20mm apart for the components to work properly. It's designed for building scale models so this shouldn't be a problem in practice.

Hope that helps.

Alex

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