Polyline pipe with shortened pipe sections

I'm struggling to make a piped polyline where the individual pipe sections of the polyline can be shortened to create a gap between the pipe sections. The miter angles of the sections and the pipe diameter are to be preserved.

Anyone have any suggestions? DeBrep the pipe into its components did not work work out.

Replies to This Discussion

Permalink Reply by Joseph Oster on November 10, 2015 at 6:14pm

Attachments:

polypipe_2015Nov10a.gh, 7 KB

Permalink Reply by Anton Bakker on November 10, 2015 at 6:16pm

Joseph, thanks for your reply. I need to preserve the miter angles on the sections.

Permalink Reply by martyn hogg on November 10, 2015 at 6:27pm

One way might be to create angled planes at each discontinuity point then move these planes towards the centre of the polyline segments. Use these planes to get intersections with the pipes and then loft these intersections.

Permalink Reply by Anton Bakker on November 10, 2015 at 6:29pm

pframes does not give me the planes I need. Do you have an easy way for generating the planes.

Permalink Reply by Joseph Oster on November 10, 2015 at 6:29pm

Attachments:

polypipe_2015Nov10b.gh, 13 KB

Permalink Reply by Anton Bakker on November 10, 2015 at 6:41pm

Joseph, ah, much closer. I can tell I did a poor job giving exact goals. I need to just scale the length of the pipe and by a distance. I may try a bit with the length of the polyline segment and figure the reduction size. I would also need to do it with the line segment being the Z axes of the pipe segment plane.

Permalink Reply by Joseph Oster on November 10, 2015 at 6:43pm

Go for it! Show us how. I'm here to have fun, not do your work for you. You're welcome.

Permalink Reply by Anton Bakker on November 10, 2015 at 6:49pm

Sorry, here my struggles based on DeBrep

Attachments:

test.gh, 122 KB

Permalink Reply by Joseph Oster on November 11, 2015 at 11:07am

Here is another failed effort... After 'DeBrep' of the pipe, I grabbed the edges of the segments (the cross section ovals at the miter joints) and moved them toward the center of each segment, then lofting them. Unfortunately, these re-constructed end curves are not aligned and so the loft is twisted.

Permalink Reply by Anton Bakker on November 11, 2015 at 5:40pm

I ran into that issue as well. I adjusted the seams and had to flip one of the ovals. You definitely helped me working through this (and not quite done yet), mucho appreciated!

Permalink Reply by Joseph Oster on November 11, 2015 at 11:10am

So here is my fourth attempt - I don't know if it works for your test example because you didn't include the polyline in your code.

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