Kangaroo
Kangaroo is a Live Physics engine for interactive simulation, optimization and form-finding directly within Grasshopper. See More
generative modeling for Rhino
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Niels De Temmerman
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Niels De Temmerman's Discussions
Principal curvature lines on surfaces: need some advice please
13 Replies
Hi, To generate a grid structure based on a surface, I wanted to determine the principal curvature lines in a UV-point. This seems more complex than it sounds. Though, there is a Principal curvature…Continue
Tags: surface, on, line, curvature, Principal
Started this discussion. Last reply by to] Feb 10, 2011.
Normals on a surface are shifted into space, not on right location?
5 Replies
Hey everybody,I managed to make a ruled surface (hypar), make some subdivisions by a grid of lines and now I want to have on each intersection point of the gridlines a vector which is normal to the…Continue
Tags: reparametrize, surface, on, normals
Started this discussion. Last reply by Paolo Cappelletto Oct 28, 2009.
How to generate a triangular line grid based on a collection of points?
6 Replies
Hi everyone,I am fairly new to Grasshopper, but I've managed to construct a definition which will subdivide a triangular face of an Icosahedron, with the ultimate goal of building a geodesic dome…Continue
Tags: by, lines, points, connect, grid
Started this discussion. Last reply by Niels De Temmerman Oct 18, 2009.
Niels De Temmerman's Page
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Niels De Temmerman replied to Henners's discussion 'Beginners Question' in the group Kangaroo
Daniel,
the scissor linkage is nice to play around with.
The addition of rigid line elements would be a bonus. I see in the settings component that there is a 'friction' function. can it be applied to a pivot hinge, around a single…
Niels De Temmerman replied to Henners's discussion 'Beginners Question' in the group Kangaroo
Ah...
It works ;-)
and looks awesome
Our research group Transformable Structures is involved in rigid origamy, but also deployable scissor structures. Can hinges between two beam elements be modeled as well, with appropriate…
Niels De Temmerman replied to Henners's discussion 'Beginners Question' in the group Kangaroo
Thanks for replying so quickly.
The missing plugins... that makes sense. I'm on it
Niels
p.s.: do you have any definitions which make use of galapagos?
Niels De Temmerman replied to Henners's discussion 'Beginners Question' in the group Kangaroo
Daniel,
I marvel at the examples videos I see about Kangaroo, yet do not manage to get an example working. All example files I try to open are missing objects (I think this is due to the non-backward compatibility?).
Currently I am…
to] replied to Niels De Temmerman's discussion 'Principal curvature lines on surfaces: need some advice please'
One way would be Modified Euler or RK4 algorithm
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[uto]
Niels De Temmerman replied to Niels De Temmerman's discussion 'Principal curvature lines on surfaces: need some advice please'
Yes, I've noticed that indeed. (supposedly) identical lines, generated by two separate points, are deviated from one another, whereas they should coincide. It is a small error, but it is there. Good for preliminary design though...
Would…
David Rutten replied to Niels De Temmerman's discussion 'Principal curvature lines on surfaces: need some advice please'
If we're going to turn this into a proper component, then I'll need to ask the Seattle math-heads for a better algorithm. Currently the deviation between the sampled curve and the 'real' curve is compounded, which is a $3 way of…
Niels De Temmerman replied to Niels De Temmerman's discussion 'Principal curvature lines on surfaces: need some advice please'
IT WORKS...thank you!
David. your file works flawlessly. I've connected a hypar surface and a helix to your script, and after introducing some points on the surface, your definition nicely draws the two perpendicular principal curvature lines…
David Rutten replied to Niels De Temmerman's discussion 'Principal curvature lines on surfaces: need some advice please'
Ah, attachments.
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David Rutten
david@mcneel.com
Poprad, Slovakia
David Rutten replied to Niels De Temmerman's discussion 'Principal curvature lines on surfaces: need some advice please'
I extended the script, it now finds points in both directions, and you can say whether you want to use the minimal or maximal curvature at the sample points. You can also specify a rotation angle to add to each sample, so you can get these curves at…
Evert Amador replied to Niels De Temmerman's discussion 'Principal curvature lines on surfaces: need some advice please'
Hi Niels,
How about using Chris' approach as below, then get the line from the sample point to the circle centres, rotate this line 90 degrees over the plane built with 3 quadrants of the circle and moving this rotated line to the sample…
Chris Tietjen replied to Niels De Temmerman's discussion 'Principal curvature lines on surfaces: need some advice please'
Sorry, I've been completely misunderstanding what you're looking for (and there's an osculating circle component in any case). I tried to do this once (that is create the curve of principal curvatures) but had no luck with it at…
Chris Tietjen replied to Niels De Temmerman's discussion 'Principal curvature lines on surfaces: need some advice please'
Is this what you're looking for?
Chris
Niels De Temmerman replied to Niels De Temmerman's discussion 'Principal curvature lines on surfaces: need some advice please'
Thank you Chris,
I've connected your definition to my surface and my point definition, and it shows two curves, as an intersection of the planes you defined with the base surface. This is indeed in that specific point, the principal…
Chris Tietjen replied to Niels De Temmerman's discussion 'Principal curvature lines on surfaces: need some advice please'
There's some redundancy of components that could be eliminated.
Chris
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