I often want to snap to the intersection of U and V isocurves on a surface. The Intersect Osnap doesn’t work in this case.
Is there a way to do this that I haven’t discovered?
I normally ‘ExtractIsocurves’ then snap to the intersect of those…but would be great to be able to just snap on the isos directly!
I’m with you.
This simple addition would improve a lot Yue new users experience.
Everything visible should work.
How would you like to tell Rhino which isocurves to use, given they could be at any u or v position, not just convenient ones like the halfway points, say?
I think for a start, I’d like to be able to snap to the intersection of visible isocurves - like the intersection of the two yellow ones shown in my image. For example, if I want to draw a line tangent to one of them, then the tangent osnap should recognize the isos.
+1 to this. A “Visible Iso” snap would be really neat
Hello- along surface edges, the Knot Osnap can help if the isocurve dernsity is 1. The middle iso on a single span surface is not a knot so that one fails too.
For now, that particular one can be done by centre snap.
Hi @pascal yes that’s helpful too.
I gave a bad example! Nornally it’s not the centre I’m looking for…
No, I understand. It’s not a bad example, just a simple one. A simple example starts a dialogue which can explore more complex criteria. That’s usually a better vehicle for requirements elicitation than starting from an example that is so complex that the complexity hides gaping holes in what’s needed.
Anyway, I just thought the centre thing was worth mentioning for people who did want to snap to the visible intersection within a quadrilateral.
Yes, that’s a good point. In any case here’s a slightly less simplistic example…
For now a dumb macro might be of some use
#_ExtractIsocurve _Pause _Direction _Both _ExtractAll _Enter
Thanks Pascal, that’s great
was searching for this very topic and hope you make this macro into a standard command along the lines of “extractsrfIsocurve” or have it pop up like the standard command does in the command line to make it easier to search for.
Hi Ryan -
ExtractWireframe will get you this, but includes the edge curves as well.
ahh got it thanks! not to much work to remove what I don’t want, but would be cool to just individually select the isocurve or curves I want extracted. Sort of along the lines of the “move extracted Isocurve” command.