100516 structDrawRhino mesh inflation.avi

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Comment by Daniel Piker on May 12, 2011 at 7:37am

Hi Roberto,

Sorry I'd missed your earlier replies.

I think it will be better to continue this conversation in the Kangaroo group discussion forum rather than as comments to this video, so we can better keep track of it and post files etc

Comment by Roberto Maffei on May 12, 2011 at 6:08am

Dear daniel, can you help e with the script you've uploaded on the 9th? unfortunately, when i inflate the cushion, it does it quite regular (no simulation of wrinkles). do you have any idea about what i'm doing wrong?

thanks

Comment by Roberto Maffei on May 10, 2011 at 3:47am

let's say, my cushion looks much more regular compared to yours! it looks definitely not realistic.

Comment by Roberto Maffei on May 10, 2011 at 3:32am

great! it is exactly what i'm looking for and i would like to try with several shapes, using the same principle! it looks really nice!

unfortunately from the definition i don't understand which is the mesh you started from. was it done in rhino? i don't see it!

and now, if i change the pressure, my cushion doesn't produce wrinkles but its boundaries stays straight (as kept in place by a rigid frame). what's wrong? i've just changed the value of pressure.

Sorry but now this blog doesn't let me upload any pics or .ghx to show you my problem.

thanks a lot

Comment by Daniel Piker on May 9, 2011 at 6:24pm

Is this something like what you are after ?

http://dl.dropbox.com/u/26034251/cushion_tie.3dm

http://dl.dropbox.com/u/26034251/cushion_tie.ghx

 

The surface will approximately maintain its area (how closely depends on the mesh stiffness relative to the pressure), and this will indeed lead to some wrinkling.

However, I suspect the mechanics of exactly how this wrinkling occurs in real life are actually fairly complex, and dependent on the particular material, so quite tricky to simulate perfectly. Using a finer mesh should help a bit with this though.

 

I made the mesh start very slightly separated, to prevent the vertices from becoming welded together (this separation can be made very small, as long as it is above the rhino tolerance).

Comment by Roberto Maffei on May 9, 2011 at 4:24pm

thanks now it works!!

 

anyway, what i would like to two regards 2 things:

first, like in the pic, i would like to inflate a cushion putting some restrains (like a rope between the two foils) and than i would like to control the length of the rope. 

 

second, (looking at the sketches around the pic), i would like to predict how the cushion reduces its length in the x or y direction due to the inflation. this question implies that I need to keep constant the surface area of the mesh during the transformation (it is only bending in two direction) but I don't have any idea if that's possible.

 

in real word this process most of the time produce wrinkles (for example at the corner of the cushion).

 

thanks for your help

 

 

Comment by Daniel Piker on May 9, 2011 at 3:46pm

That's part of UTO's mesh tools:

http://utos.blogspot.com/p/downloads.html

Comment by Roberto Maffei on May 9, 2011 at 3:31pm

hi! unfortunately i can not open the definition. it says i don't have mesh NakedEdge. can you tell me where can i install that tool? thanks

Comment by Daniel Piker on May 9, 2011 at 12:41pm

Roberto - here is another example, where you can simply replace the starting mesh with a different one from Rhino.

http://dl.dropbox.com/u/26034251/inflate2.ghx

The only limitation on the mesh is that it has to consist just of triangles, no quads (you can use the triangulatemesh command in Rhino to ensure this).

This video might be helpful for showing the basics of running the simulation in Kangaroo:

http://vimeo.com/20308963

 

Let me know if you get stuck

Comment by Roberto Maffei on May 9, 2011 at 9:32am

wow, it looks impressive. i've downloaded it and i'm looking into the inflate definition. are there any tutorials about that? i'm trying to change the initial shape (the box) but i'm experience already some troubles...

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