Niels De Temmerman's Page

"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…"

"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…"

"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?"

"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…"

"One way would be Modified Euler or RK4 algorithm   -- [uto]"

"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…"

"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…"

"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…"

"Ah, attachments.   -- David Rutten david@mcneel.com Poprad, Slovakia  "

"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…"

"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…"

"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…"

"Is this what you're looking for?  Chris"

"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…"

"There's some redundancy of components that could be eliminated. Chris"