what is wrong with this GH-generated model?

Hi,

Can someone help me find what is wrong with my model?

I created a brep (a polysurface to be more precise). It has some weird behavior when it's being meshed. If you zoom in on the model you'll see that even the preview geometry is literally 'rough around the edges'. And if you try to mesh the brep, the resulting geometry is very messy. While running the meshing, zoom in on the edge of the base or the curved 'gutter that runs over the surface and you'll see what I mean.

The Brep itself seems fine. I tried Rhino for MAC as well as Windows, but can't find/fix the problem.

Any help would be greatly appreciated.

greetings, Jack Bakker

PS: I know this is not a specific Grasshopper question. I already posted on the general Rhino forum, but repost here because the model was completely generated in Grasshopper, which may hold a clue to solving the problem.

Attachments:

forum_surface.3dm, 682 KB

Replies to This Discussion

Permalink Reply by Yoann Mescam (Systemiq) on March 1, 2013 at 12:52pm

Your model is 469 millions units far away from the origin, and 123000 units long.

Is that really needed ? That could cause some of the problems you are encountering.

Permalink Reply by Hannes Löschke on March 1, 2013 at 2:00pm

FAQ's ...the absolutely helpful things, nobody ever seems to read.

Http://wiki.mcneel.com/rhino/farfromorigin

Permalink Reply by Michael Pryor on March 1, 2013 at 2:03pm

Also, when things are to far from the origin gh takes much longer to solve.

Permalink Reply by Jack Bakker on March 3, 2013 at 7:26pm

Thanks for all the input.

@ Systemiq: The model is part of a bridge that is roughly 30 by 300 meters. And in some parts I need precision on a sub-centimeter scale. That's why the model is in mm's and has such a high number of units. The distance from the origin is the actual location of the object in the 3d model of the surroundings.

@ Hannes: Thanks for pointing to the article, it covers all the above mentioned things.

@ Michael: I'll try the suggested solutions and hopefully gain some performance as well.

Jack

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