How to derive a 2d intersection?

Rhino Rhino for Windows
,
1

I’d like to be able to use a plane, object, or some operation to be able to derive a 2d intersection, but can’t seem to find a way to do this. In the example below, I’m trying to get the shape shown as the single polyline:

Screen Shot 2022-02-12 at 9.31.56 AM
Screen Shot 2022-02-12 at 9.31.56 AM888×772 43.6 KB

If I try using a plane to cut through the extruded perimeter, I get a solid surface…

FYI, sometimes it will be on an angle, so using the profile that was extruded into the “walls” won’t work.

What are some ways to do this?

2

Have you tried to Project a curve from frontview?
Or make a plane and intersect.

3

Yeah, thanks - just found out there is an “intersect” command… thanks!

4

Additionally, there is _Section

5

This is great. Thanks.

6

And there is Contour.—-Mark

7

Lol! I’ll take a look. Sounds familiar but I don’t remember ever using it.

8

Hi,
And this is a bit more complex