Hello - what behavior is that?
-Pascal
Thank you for showing where to find it, I had no idea!
But why doesn’t right-clicking Osnap at the bottom of the app bring up all the same options as in the Tool menu?
Also, I can’t get the “hold down control” to work. I know I’ve had it at one point, but right now it’s still a mystery to me.
I really hope you reconsider in the future and att surface snap to the bottom top level options. There’s plenty of room by the “project” and “disable” buttons.
And yes, like @skysurfer said, it also baffles me why surface snapping isn’t enabled by default.
sorry I wasn’t clear.
I mean the ability to pick the intersection of the isocurve as middle or end Osnap.
a lot of beginner where expecting this.
Hello - this is because these are not curves, other than ‘by implication’ you might say. When the operation is constrained to a surface then isos do become snappable to some extent - ‘int’ for example in ExtractIsoCurve. I’m not convinced, despite beginner expectations, that snapping to non-existent geometry is helpful as a basic behavior - there is (generally) no particular significance to an isocurve other than as visual information about the surface. I can see there might be cases when it might be useful to consider them as curve, and maybe there should be a way to do this more easily, but as default behavior this seems like it would be more confusing than helpful.
Can you give me a concrete example of where this would make sense?
-Pascal
beginner doesn’t know this as visual curve. it’s on the screen so it’s a curve.
because of this they’re always trying to use it to find the center of the surface.
In more general way the center onsap should be able to catch the center of a surface (uvn 0.5,0.5).
edit: in general what I see on the screen should behave the same, doesn’t matter if is a curve, an edge or an isocurve.
Hello - do you expect to be able to extrude an isocurve?
-Pascal
hello.
… mmm… no.
my target is to use it as construction line.
“let’s construct this circle in the center of this surface” as example.
But you said this:
ExtractIsocurve is available, remember, and has History.
My point is that these are not curves, and beginners who think they are curves may simply be mistaken and need to learn - nothing wrong with that. I’m not sure meeting beginners expectations is, in itself, the most useful overarching criterion.
-Pascal
I see your point.
I don’t need to extrude it, yet, but this doesn’t mean that it shouldn’t. 
In general more exception you have less user friendly is the software.
following your logic, for me, YES you should be able to snap, extrude and cntrl+CLICK (sub obj selection) any visible isocurve.
because they’re not “real” I’m thinking of a display mode or option that shows only the middle uv isocurves and this isocurves are usable.
Isocurves are thinner than edges, and you can turn them off, but that’s not the point I wanted to make when doing this thread.
My point is that the method in Rhino currently to enable snapping to an isocurve is so hidden that it’s impossible for new users to find it (and so convoluted that I have to look this thread up every time I want to remember how do it).
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