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.
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.
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.