Mesh relaxation. Problem with mesh edges.

Hi guys,

I have just started to experiment with mesh relaxation with Kangaroo for a university project and I think that while in principle I'm doing ok, I have some problems with the mesh edges. While I would like the to be in two sets of parallel edges, they are cnverging towards a vertice of my intial mesh wich in the end results into an unven relaxation of the mesh. Any ideas how I could reposition the mesh edges?

I attach the rhino and gh definition files, just in case they help.

Thanks,
T

Attachments:

mesh relaxation attempt.3dm, 47 KB
mesh relaxation attempt.gh, 7 KB

Replies to This Discussion

Permalink Reply by RENE on November 21, 2012 at 12:21pm

Try the force density relaxation tools from geometry gym plugin, here's an example image by Jon Mirtschin...although it looks similar to what you have, I'm guessing that it can be resolved by tweaking the custom mesh settings if you're using any or if you're going from brep to mesh with your surface.

Attachments:

exfd.png, 98 KB

Permalink Reply by Thanasis Korras on November 21, 2012 at 12:26pm

Thanks very much for this. I don't have geometry gym but I'll take a look at it. However I am trying to work it out with Kangaroo since it approximates fabrics better. Again thank you for your input.

Permalink Reply by RENE on November 21, 2012 at 12:31pm

I tried to look at your kangaroo one too but the .3dm file has nothing in it!

Permalink Reply by Thanasis Korras on November 21, 2012 at 12:33pm

Sorry, the default layer is just hidden! It just has a brep in it that I have set to be my intial Brep in my definition and then tranform it to mesh.

Permalink Reply by Manuel Sotomayor Millan on November 21, 2012 at 12:50pm

You have to take car of the distribution of the springs in the mesh.

Each spring equals a force, and in your case there are much more springs in the vertex at the bottom right part of the image, obviously the mesh relaxes towards this position.

Try subdividing the triangle with a ConstantQuads component from Weaverbird, it will lead to an even disposition of springs on the mesh, thus a closer behavior to reality.

Permalink Reply by RENE on November 21, 2012 at 1:01pm

also make sure the wbedges component that's going into 'connection' for springs also goes to 'restlength'!

Permalink Reply by Thanasis Korras on November 22, 2012 at 12:23pm

Thanks a lot guys. I just had to reconstruct the mesh from my intial vertices and then the ConstantQuads command from weaverbird worked fine!

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