I have an ellipse quadrant on the end of a base curve, the base curve makes two soft 45 degree bends, equaling 90 degrees. I want to drag the ellipse quadrant along the base curve through the two 45 degree turns, and have the ellipse morph, maintaining geometry relative to the base curve. I already …

[high res test] Sad Tulip.gh (26.2 KB) ?

please focus on : The circled geometric relationship must be preserved. What I see is: a line+ ellipse quadrant. So at any point of this curve, the distance to the tangent point on the elliptical curve (venturi) is different + the angle between both is different. Now as I move up to the turns, th…

The relationship between the straight section of the curve and the ellipse quadrant, is elliptical. 4:1 actually. What if we just bent the right side of the straight section down, would the relationship still be elliptical? I doubt it. So that means that the elliptical portion would need to bend pro…

So you can calculate an new curve for any point. What about the irregular curve in the corners? I am no good with python, but there are specialists on the forum who can programm a python component for such relationships. But be clear/precise on what is needed at such an irregular spots. For now I…

[image] Tedison: The circled geometric relationship must be preserved, because it is a venturi. [image] I see. So it’s not an alignment problem, you do want to Flow the quarter ellipse from a straight line to a subcurve of your target curve. Just so we’re clear, the ellipse is going to mor…

[Schermafbeelding 2026-05-19 om 23.31.08] Curve Controlled Curve V6EW.gh (13.0 KB)

Obviously there is difficulty for me to describe what I need, in a manner that all can understand clearly. This is the essence of the problem))

Yes I believe you understand, but the relationship between the ellipse portion and the main curve, must remain constant.

Hi Eef. That’s not it. The base point of the ellipse is no longer tangent to the base curve. But thank you.

We have a winner!!! The inside ellipse is exactly what I am looking for! Thank you very much Volker!

Maintain Relative Geometry While Dragging Along an Irregular Curve

Grasshopper

Volker_Rakow (Volker Rakow) May 19, 2026, 10:51pm 35

Sad Tulip.gh (26.2 KB)

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Maintain Relative Geometry While Dragging Along an Irregular Curve

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