algorithmic modeling for Rhino

Hi there!

I am new to using Karamba 3d and I am attempting to use it on a sierplinski tetrahedron which I created in grasshopper.

I would like to use Karamba to show the deflection that would occur on the structure rom the triangles above. I would also like to work out if there is a requirement for either a double support or for a wider support at the weaker nodes.

I am currently getting this warning: 'There are 6 rigid body modes in the system. This means some parts can move freely without causing deformation. Try to use the 'Eigen Modes'-component and activate the display of local coordinate axes: The first eigen-mode will be the rigid body motion. If this does not help, check whether you have a pinned support directly attached to a hinge. A hinge introduces an extra node which may cause the problem. When analyzing a flat shell structure one has to lock the rotation perpendicular to the plate in at least one node.' But nothing seems to happen with I use eigen and I am unsure where and what to use this for

This only occurs when I am applying the Karamba to a more complex sierplinski.

I applied Karamba to just a simple tetrahedron and this has given me a thickness to the structure. Does this therefore mean that there would be no deflection as the max displacement is showing as 0.00001? (see below)

I have attached the grasshopper file I have been working on.

Thank you so much in advance,


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Replies to This Discussion

Hi Alex,

Usually this error message comes when you don't have enough supports on the structure.

Can you check that? What did you define as supports?

All the best,


Dear Alexandra,

the problem was that the 'Elements'-input of the 'Assemble'-component was not flattened. This resulted in multiple models (see attached file).





Thank you Clemens and Arthur, 

I think the problem is still that I am not getting any data anaylsis because the supports I have defined are incorrect. I am using the vertices from the sierplinski triangle but this is not giving me any results. 

I want to achieve finding the material distribution such as the tutorial belows but without the correct supports it won't seem to analyse the structure.

Sorry I am unsure what I am doing wrong! Alex






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