Closed shape to Pipe

Rhino Rhino for Windows
1

I’m trying to convert a “closed form” in a pipe, but I see that this form is even a group of lines, (I think 5) and I can not define it as a power curve.
No achievement exploit it, not break it down into a single line.

Therefore I can not turn it into a pipe.

(I think is necessary to turn this way a pipeline step).

Someone can tell me how I can simplify this form of 5 lines into one?
Then convert the closed form in a pipe?.
(a file here)
Shape with 5 lignes.3dm (44.5 KB)

Grateful

2

Your mesh object has a lot of difficult points and you can’t extract points to pass a curve. I would pass a new clean CurveThroughPt over your object vertex by vertex and pipe that - this will definitely work but I don’t know your tolerance for error or deviation from the existing geometry.

Shape with 5 lignes - fin.3dm (759.6 KB)

3

Hi Claudio,

your file does not contain curves but 5 mesh pieces. Zoom close to the objects to see it. To get the curves from this i recommend this:

  1. _Join the meshes into one object
  2. Use _Weld on the result with Angle setting of 180
  3. To extract the 2 mesh borders as closed polylines use_DupBorder

To get a smooth curve without segementation from one of the polylines i’ve used the “Curve: control points from polyline” command in the Curve toolbar and set the option CurveType=Interpolated…

Shape with 5 lignes_cg.3dm (77.4 KB)

c.

1 Like
4

Thank you a lot !!

1–( i see in the Clement message a simples steps to resolve that…, and
yes is true what you say.
i can find now the Pipe from the shape !). thanks

2–I need to try what Fin says too.

Greetings & Thank you

…

5

"Thank you Fin "

( for me was a little problem to resolve that,…
i see that you can easy find a solution)

Thank you again !
Best regards
…

1 Like
6

Hi Claudio,

This is a mesh. My quick (2 minute) workaround was to dial in “snap to vertex” and build a freeform curve …
Command: _InterpCrv
Start of curve ( Degree=3 Knots=Chord PersistentClose=No StartTangent ):
Next point ( Degree=3 Knots=Chord PersistentClose=No EndTangent Undo ):
etc etc
Next point. Press Enter when done ( Degree=3 Knots=Chord PersistentClose=No EndTangent Close Sharp=No Undo ):
Command: Pipe
Select curve to create pipe around ( ChainEdges Multiple ):
Radius for closed pipe <1.00> ( Diameter ShapeBlending=Local FitRail=No ):
Point for next radius. Press Enter for none: