Help me !!!! Distribution cup form on surface ???

Replies to This Discussion

Permalink Reply by Daniel Piker on February 7, 2013 at 5:04am

Hi Reza,
The overlaps should be possible to avoid by increasing the stiffness of the springs.
However it generally won't be possible to avoid having some gaps with more than 3 sides like the ones you highlighted. They are what enable the surface to have curvature. Perhaps something a bit denser than what you have now is possible though - what effect are you after?

Permalink Reply by David Stasiuk on February 7, 2013 at 5:27am

There are a couple of things about your definition...first of all, Kangaroo has a great utility in it that creates  connectivity between all points in a set...you have a fair amount of duplication in your inter-connectivity network that this cleans up really quickly.  Secondly, you may want (in addition to your springs with cutoffs) to employ a power law to help pull all of the circles together, rather than the unary forces you are employing here.  Basically you're just pushing them upward in space...but a power law actually engages in attraction between them.  So your elements actually pull toward each other in general, and then your springs keep them apart in close proximity.  So I would use the power law force to pull them together, and then relax it once you've achieved a suitable organization.

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Permalink Reply by Anton Burdeinyj on May 12, 2013 at 3:20pm

Dear Gentlemen,

 

I have tried using this power law recently and could not make it work - it results in an index error. So I decided to have a look at examples here and have a couple of questions. First of all, here it gives me the same index error. (I can see the force input is flattened - nevertheless.) Secondly - why is the spring component different from the one I have - it has (cutoff, compfail, tensfail)

It might be basic, but due to insufficient knowledge I require some clarrification please.

Much appreciated.

 

 

Permalink Reply by Daniel Piker on May 12, 2013 at 3:53pm

Hello Anton,

I changed the spring component a bit between versions 0.06 and 0.074, but I left the old one in as a legacy component (so definitions using the older spring component will still work). That's why you see these differences.

Do you still get the index error when switching the SimulationReset toggle to true ?

Permalink Reply by Anton Burdeinyj on May 14, 2013 at 1:29am

All right - it works :) thank you for help

Permalink Reply by Daniel Piker on February 7, 2013 at 5:58am

This gets me thinking as well about trying to simulate the cones as well as just the circles, because I think they also play an important part in creating the curvature.
If you had for each cone a spring for the height, with a larger sphere on one end and a smaller on the other...
Can you flip some cups and still join them? I guess it would mean puncturing them.
That way you could reverse the curvature in some places.
With a bit of work I think I could make kangaroo choose when to flip cups to match a target surface

Permalink Reply by reza salehi on February 7, 2013 at 12:06pm

YESSS