Auto CPlane won't attach to a circular surface?

Rhino Rhino for Windows
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1

Hi Group

I can’t seem to get auto c-plane to attach to a circular surface that has been made from a revolved sketch, which has segments?
see image 1 below
image

but if I delete the surface and create a new one from the two curves it creates a single clean surface, and the auto cplane works with it?
see image 2 & 3 below

image

image

is this normal behavior?
can I do anything to simplify this?
is it a bug?

2

AutoCPlane snaps to a revolved surface unless it’s revolved a full revolution.

image
image1830×1248 197 KB

I think it’s a bug

AutoCPlane_revolved-surface_problem.3dm (167.6 KB)

1 Like
3

Hi,

Yes this is a bug. The Auto CPlane doesn’t align to surfaces with seams. In this case it should because the face is planar. I opened a bug here.

2 Likes
4

Hi Joshua
thankyou, in the short term is there a quick command or way to change a surface like this into something that can be snapped to?
or is it just a case of deleting it and remaking the surface?

5

Hi Adrian -

In the short term, it’s a case of remaking those, yes. In many cases, you can use the Cap command to replace such surface after the revolved version has been deleted.
-wim

6

Thankyou Wim