Grasshopper and *conic* corners for a rectangle

I’m a grasshopper beginner and this is my first real question please.

Other things equal, is it possible to have Grasshopper parametricise the rounded corners of a rectangle, where those corners are conic corners?

i.e. to adjust the rho or point for the conic corner to pass through

Ideally, to adjust the corners of a conic-cornered rectangular surface.

Thanks for any suggestions.

Read this carefully:

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Do you mean something like this? (5.9 KB)

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Thanks for your suggestion.

Yes, something like that, although those corners are regularly rounded corners, i.e. a simple arc radius at each corner with straight lines joining them.

A conic-corner is more like the curved corners of a CRT-type TV screen.

(The value of having a conic corner, for example on the base of your file, is that it should be possible—easily or at all—to loft it with a circle at the top.)

I have done a quick search already and cannot see that Grasshopper can do conic-corners. If it cannot, I will fall back on something like the definition you’ve shown.


and cannot see that Grasshopper can do conic-corners.



conic (11.8 KB)

edit: but this only manipulates the rho value; there is probably a way to make the interpolated version (like in rhino) but I sadly don’t know how

edit2: btw if you put in “0.707106781186548” for the weight you get a circle


Thank you so much.
You’ve given me a flying start to Grasshopper (in v.6 MacRino).

My gut instinct is to put you on ignore right now. (done!)

@Joseph_Oster common, :grin: cut him some slack – the question (his first) was reasonable and friendly,
also the linked discussion is about constructing “conic” cubes by hand in rhino, not 2d curves in grasshopper,


The Easter bunny is grumpy because it’s Santa’s turn soon.

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