Dimension the max size of an object with rounded ends that is at an angle

Rhino Rhino for Windows
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1

It must be simple, but for me not obvious:
I have the below long object (grouped curves, but could be a solid too) with rounded ends that has been rotated to a random angle.
How do I select the extreme ends of the rounded parts (or any kind of irregular end)? Quad does not work because the cPlane puts those vertical and horizontal.
Thanks

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2

In this case you could go center to center and then extend to get the intersections

3

Yes, but that seems like too much work for a simple measure.

Another idea I had was to rotate the cPlane somehow to align with the object. That should make the circle quad’s at the far ends shouldn’t? Problem is I do not know how to align the plane to a shape.

Thanks -

4

hmm, there are probably a few ways to do this.

I like the idea of an alias

Something like '_Line Cen _Pause Cen to create the centerline

Then the extend '_Extend T L 10 10

Then Trim

5

CPlane>3pt is probably the easiest…

6

Thanks for this… yes that works too.

What I find is that choosing auto cplane in perspective sometimes seems to work and sometimes not (I suspect that is just due to my doing something a bit wrong). But if it works, eg seems to only work in perspective, then its easy to align the cplane and make the dimension. But, as so often with Rhino, I think I know how to do something because it worked before, but when I try to use it later, it does not…
I guess I will always be getting use to this app…which is OK, since for me its a hobby tool.