Create an angled line on compound surface?

Rhino Rhino for Mac
1

I am not sure if my question is worded correctly, but I am wondering what the easiest way is to create an angled line from an isocurve on surface.

I have extracted an isocurve from a surface and have to create a line angled 2º from that curve. Surfaces that are perpendicular to any of my 3 world plans is ok. How would I do this on a surface that is not planar to a regular view?

If I create a C-plane to the surface in Perspective it creates angled line to side, like Top view (of course). So any tips.
I have included a model with lines created on 2 sides and a line on the 3rd surface.

I may have to go back to C-Plane school.

Thanks, Randy

Stone Seat RG.3dm (261.9 KB)

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have you tried _Rotate3D ?

it works fine for the scenario you’ve presented. (if i understand it correctly)

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I’ve had some luck with setting CPlane to object (the surface you extracted the curve from), then setting CPlane vertical, and snapping to the ends of the curve. After this you can draw a new curve at an angle like 2.5<2.

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@0netech that is what I was looking for as to using c-plane. I have many gems to do this for, I was wondering if there was a c-plane perpendicular to surface. I think you got it.

@jeff_hammond I did end up doing that for this one, but I have more complicated ones to do and was looking for a way to use c-plane I created circle with 3points and rotated from centre.

Thanks, it is always fun learning

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Then set View to Plan. Works like a charm @0netech … cheers

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Add this macro to a button if you like:

_CPlane _Object _Pause
_CPlane _3Point _Pause _Vertical

Cheers :wink:

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7

another approach might be _Line -> Normal (or from the main toolbar-- Line: Surface Normal)…
that will let you draw a line perpendicular from the surface which you can then use to do a 3point Cplane

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the picture shows you rotating everything to align with a standard cplane? if so, my earlier suggestion of using _Rotate3D was meant for the individual line needing rotated… (or-- not rotating the whole object then using rotate again on the line)

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