Given AutoCAD LISP Routine to generate a parabolic curve thru 3 points in the x-y plane with n segments of equal values of x dimensions along x axis → Create a Grasshopper component to accept given x-y plane, 3 points, and n number of segment of equal x values …generate a parabolic curve y=ax2+bx+c …

Hi @Pedro_R_Munoz , RhinoCommon exposes two functions to create parabolic-sharped NURBS curves: NurbsCurve.CreateParabolaFromFocus and NurbsCurve.CreateParabolaFromVertex With either a C# or Python component, you can use these. — Dale

Hi @dale thank you for the two leads … more specifically I am looking for a way to generate a grasshopper component similar to the LISP routine to create a segmental parabola curve thru any 3 points and of n number of segments having the same x coordinates of equal distance between consecutive point…

Hi @Pedro_R_Munoz , I can see that the LISP routine interpolates a polyline through points computed with the the parabola equation. There is no reason to do this, as you can create conics with NURBS. See if this sample helps. Parabola.gh (6.2 KB) Also, Rhino has a Parabola command - you might giv…

Hi @dale the Parabola command from Rhino does not serve my purpose of generating a parabolic (quadratic - y=ax2+bx+c) curve thru any 3 point along the parabola and with n number of segments of equal x-spacing dimension between end points … I did try it but it only works for specific cases of vertex …

Hi @dale , here is a Python script to generate Parabola thru 3 points that I got years ago from Rhino Tech support, it works exactly the way I was looking for … so this will be a good candidate to create a GRASSHOPPER COMPONENT, below the script code: import rhinoscriptsyntax as rs def fpoly(a, b,…

Hi @Pedro_R_Munoz , Again, this code creates a polyline, not a parabola. I guess if you specify enough points, then the polyline might begin to look like a parabola. But in the end, it will still be a polyline. If you want a real parabola, you’ll need something else. I’ve attached another sample t…

Hi @dale , yes certainly the objective is to have a way to create a segmental parabolic curve with a selected n number of segments to be able to discretisize the type of parabolic curve in a number of predefined segments … this with the objective to be able to build real type of structural framework…

Hi @Pedro_R_Munoz , Here is your script buried in a Python component. TestPetro.gh (6.1 KB) – Dale

Hi @dale @brian i was having trouble with my Python script to handle creating the segmental parabolic curves at different planes of just the x-y plane … managed to get it to work by selecting the right start, end, and intermediate points along the curve depending on the orientation of the parabola b…

Create Grasshopper Component from AutoCAD LISP Routine

Grasshopper

brian (Brian Gillespie) April 12, 2023, 7:54pm 10

RH-74161 is fixed in the latest WIP

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Create Grasshopper Component from AutoCAD LISP Routine

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