Scissor mechanism

[Goraca_Victoria]

Hi all!

I am trying to parametrically use grasshopper to make a very simple shutter/lattice mechanism. An example below of what I am trying to achieve:

However, what im currently achieving is this:

I understand that grasshopper isnt exactly optimised for hinges/pivots but I thought this would be simple enough to do on grasshopper - I don’t really want to learn a new program. Though, I think I should have modelled the lines with rotation around the mid point rather than at the end points i suppose.

Here is the gh file:
shutters_lattice.gh (10.5 KB)

Thank you in advance

[laurent_delrieu]

Hello
I think this link could help and also searching with scissor keyword instead of lattice.

Scissor joints in Grasshopper

[Screenshot 2023-03-19 173420] I am trying to integrate my Grasshopper model with scissor type connections into SAP2000. How can I model a scissor joint in GH such that it will read the same in SAP 2000 (i.e. it will have the same degrees of freedom in SAP also.)?

[Joseph_Oster]

@Goraca_Victoria

I am trying to parametrically use grasshopper to make a very simple shutter/lattice mechanism.

What is simple about a shutter mechanism? Your GH file uses points that are not internalized.

As @laurent_delrieu said, the keyword you want is “scissor”.

Here are some other threads that might be helpful:

Iris Diaphragm

IRIS.gh (15.7 KB) by Brian Harms on December 7, 2011

Applying surface thickness to diagonal planes

FoldingPlatec_2017Nov5b.gh (22.0 KB) by me on November 5, 2017

Elaboration on same code (by me):

Foldable stands

[image] FoldingPlatec_2017Nov5b.gh (22.0 KB) Cosmetic update, with another Rotate added at the end (green): [FoldingPlatec_2018Feb27a2] [FoldingPlatec_2018Feb27a] FoldingPlatec_2018Feb27a.gh (27.8 KB) [FoldingPlatec_2018Feb27a3] Version ‘2018Feb27b’ (below) has a separate ‘Rotation Angle’ slider for the Rotate (all) added at the end (green). It defines a ramp of panels in their extended position, independent of the “folding angle” that r…

Upfolding shading device modelling problem

Getting there. The orange group is a building with Random Reduce applied to SubSrf (Isotrim) sections to represent locations (planes) for the folding devices (shown in white). The ‘Custom Frame’ from @HS_Kim’s code is internalized and oriented to each of these planes (shown in yellow) but not yet used by the folding mechanism. [FoldingPlates_2020Dec31f2] [FoldingPlates_2020Dec31f] FoldingPlates_2020Dec31f.gh (263.1 KB) Happy New Year!

P.S. This one I did on March 22, 2017, found in the link @laurent_delrieu posted, looks the most similar to your code and image:

Translational Scissor Structures

scissors_2017Mar22c.gh (32.3 KB)

[martinsiegrist]

Would you mind if we change the topic title to ‘Scissors mechanism’?

[Goraca_Victoria]

hi yes thats fine