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you can do this using instant 3d+intersection curve. just create a plane parallel to the section you need, open a sketch on that plane, select the surface, got to tools->sketch tools->intersection curve , turn on the curvature comb on the intersection curve , exit the sketch, click on the plane to turn on instant 3d handle, move the plane using instant 3d handle , the intersection curve and it's curvature comb updates as you move the plane.
see the attached screen capture.
CC.zip 260.1 KB
Thanks Tim, that does work, though it seems to reset itself if it passes from one surface to the next. The curve keeps updating as it should but the curvature comb disappears and I have to re-enable it.
Not a major problem - but it kind of disturbs the work-flow.
I'm pleased to see that it works in real-time, you can tell it's not easy for SolidWorks, but it handles it!