simple mesh relaxation issue

Hi Daniel,

I've given Kangaroo2 a quick try and it really works like a charm, speed and stability look definitely amazing.

I've run into a small issue though. I've tried a basic mesh relaxation with fixed perimeter (open mesh, using naked vertices as anchors) and I get an Invalid Mesh as output. Note that the same mesh, with the same setup (naked vertices as anchors, edges as springs with 0 rest length) solves in the old Kangaroo (and Kangaroo zombie) with a valid mesh.

I think I'm missing something here about the new setup but I just can't figure out what it is. I am attaching the definition (mesh is internalized).

Cheers,

Alessio

Attachments:

relaxation issue.gh, 24 KB

Replies to This Discussion

Permalink Reply by Daniel Piker on March 22, 2015 at 4:29pm

Hi Alessio,

This is caused by the same issue described here:

http://www.grasshopper3d.com/group/kangaroo/forum/topics/size-limit...

Because some edges of the mesh are shorter than the tolerance, the ends are getting combined and messing up the topology.

I will release that version with the tolerance setting soon, but in the meantime the issue can be worked around by scaling everything up.

Daniel

Permalink Reply by Alessio Erioli on March 22, 2015 at 4:43pm

Thank you Daniel!

In fact, I noticed some weird edges appearing when hitting the reset button and I thought about some collapse going on or a graphic card glitch so I didn't give it much importance.

Just tested and it works great, good to know!

Permalink Reply by Fabio R. on September 12, 2016 at 4:26am

Hi Daniel,

Is this what is going on here as well ?

I got this mesh to equalize in a seperate rhino file, but when added into my actual workfile it fails. In my workfile it I had to cull edges below 1 unit due to an error. ( other file presented no such error ). It seems a threshold or units related issue, but as far as I can compare everything seems the same between both files.

Thanks,

Fabio

Attachments:

GH - OCHD - MESH EQUAL TEST.3dm, 50 KB
GH - OCHD - MESH EQUAL TEST.gh, 14 KB

Permalink Reply by Fabio R. on September 12, 2016 at 10:31pm

Thanks David,

I got to work. But honeslty, I still dont cant say exacly why. I placed the formula placed above twice in the same file, linked to the same mesh. Exacly the same settings, tolerances and unit settings. One worked, the other did not. I am missing something here.. but its resolved for now.

PS: I have been following your work for a while, thanks for all your input through the different posts, they have been priceless in learning kangaroo on this slow trial / error basis.

Thanks

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