Taper pipe command

Dear Grasshopper member,

I have been using the pipe tool to pipe a mesh created from a surface using the demonstration in the Grasshopper Primer Manual p.84 so to create a tubular structure to a tower, this has worked well. However I would ideally like to taper this pipe so that the radius of the circle is different at both ends of the pipe thus all the pipes gradually reducing in size the higher they go.

There are similar discussions on the forum using the sweep1 command for a curve but have not had much luck making this work either.

Can you help?

Tom

Replies to This Discussion

Permalink Reply by Tom on May 11, 2011 at 3:12pm

Pieter

Guess what now? I have a major case of jagged edges at the junction of the pipes, see attached.

For some reason it doesn't happen with the regular pipe command. Can this be solved?

Regards

Tom

Attachments:

jagged edges.bmp, 2.1 MB

Permalink Reply by Pieter Segeren on May 11, 2011 at 3:31pm

You can fillet the corners to solve this. (fillet the sharp corneres of a curve component)

Permalink Reply by Pieter Segeren on May 11, 2011 at 3:39pm

the new def for this:

Attachments:

Tube Filleted Diagrid Tapered Pipes_PSG.ghx, 338 KB

Permalink Reply by Tom on May 11, 2011 at 4:03pm

Pieter

thanks but the Tube Filleted Diagrid seem to have lost the has lost the diagrid (is curved again) also i have noticed that some of the pipes appear flat on the diagrid?

Sorry!

Regards

Tom

Attachments:

curved pipes.bmp, 2.1 MB
pipes appear flattened in places.bmp, 2.1 MB

Permalink Reply by Pieter Segeren on May 11, 2011 at 4:12pm

Have you tried the new definition I uploaded?

Attachments:

TomClip.png, 173 KB

Permalink Reply by Tom on May 11, 2011 at 4:28pm

Pieter

I tried the file TubeFilletedDiagridTaperedPipes.ghx and notice the fillet command, even when I turned the radius to 0 to get the "diagrid look" it became jagged.

Regards

Tom

Permalink Reply by Pieter Segeren on May 11, 2011 at 4:30pm

Don't set it to zero, or you'll remove the fillets.

Permalink Reply by Tom on May 11, 2011 at 5:01pm

Pieter

it worked better when I set the number slider to integers and adjusted it that way. Still not quite as good as the weld on the original piped tower?

Thanks.

Tom

Permalink Reply by Pieter Segeren on May 11, 2011 at 5:36pm

Tom, upload the curves your building the tube with please, because I rather like the result I'm getting here with the four curves from page 184 and my last definition...
Not quite as good? You decide. I'd peronally like to be able to weld like this;)

Permalink Reply by Tom on May 15, 2011 at 7:51am

Pieter, Dedackel

I have a theory as to why the tubes appear flat in places, Please see attached example of a circle sweeped in Rhino with the circle aligned perpendicular to the rail line and a circle flat to the x and y plane. This together with the extreme angles of my tower (attached) maybe why it appears different from Pieter's tower. If it helps i created this sweep1 in "freeform" option in rhino. Do you think it would be possible to sweep the circle perpendicular to the rail line?

I look forward to your thoughts.

Regards

Tom

ps attached GHX file i have been using

Attachments: