Help with modelling

[Finlay_Johnson]

Hi,

I am having issues correctly modelling the geometry of a lampshade in rhino. The lampshade has already been produced using wood/card. The concept of the lamp is that it is made up of 4 ‘petals’ that can each be laser cut flat, folded, and then assembled. (please see images attached).

I have had a go at modelling the lampshade using a mixture of commands. Mainly, project to surface, rotate, interpcrv on surface & patch tools (In the 3dm file I have left my workings for reference). However I cannot seem to get it right. I would really appreciate if someone could explain to me a better workflow that allows for a more accurate model. The one I have created involves alot of guess work.

Thanks in advance for any help given, Fin

Light Fixture_TEST UPLOAD.3dm (874.1 KB)

[martinsiegrist]

I’d do this with Kangaroo. Look here:

Any idea how to model this accurately?

Hi @mich.platter Here’s how this can be simulated in Kangaroo. Paper can be treated as having uniform bending stiffness in all directions and very little stretch. Once we’ve made the right mesh, we can pull the vertices of the parts to be glued together. However, because it starts flat, if we pull them together straight away it tends to crumple, so here I use the ‘grab’ function to start it bending the right way, then increase the strength of the ‘coincident’ goal which glues the ends: …