Multipipe experiment

[lander (CAD CAM CNC)]

Will really appreciate some tips n’ tricks with multipipe.

I’m having trouble controlling it.

here’s sample file:
subD_settings_not working.gh (18.9 KB)

This version is similar to previous thread focused on nurbs polysrf and fillets, but instead this next experiment I’d like to try using subD.

How to fillet edges of solid union intersections

As other said, Deconstruct Brep component will give you edges curves with the same order as the Fillet Edge component expect them. [2024-06-14 11_32_59-Grasshopper - fillet pipes] fillet pipes.gh (18.2 KB)

here’s image showing my struggle with the subd version:

I could probably mend everything manually, but automation is important.

[Quan_Li]

Maybe this can help.

Multipipe gives sharp spikes

Hi Quan Li I’ll try and clarify what’s happening by illustrating a single node with no offsets. The distance of each ‘inside elbow’ point from its node has to vary with the angle between the adjacent struts in order to keep the pipe radii similar. Without this nodes would have a strange pinched appearance. The smaller the angle, the further out. At some point as the angle decreases, the distance takes it further than ends of the struts: [image] Of course we usually have other nodes connect…

[lander (CAD CAM CNC)]

Yes, that kinda helped me understand it more.

Oh I see I should probably read that whole thread

[martinsiegrist]

Depending on how much you’re planning on manipulating the result manually after the multipiping, creating mesh pipes of each curve / polyline and then shrinkwrapping the mesh pipes might be an alternative approach…

[lander (CAD CAM CNC)]

@martinsiegrist

creating mesh pipes of each curve / polyline and then shrinkwrapping the mesh pipes

That’s a really good point. It might lead to that. I hope GH supports shrinkwrap

[martinsiegrist]

mesh_pipe.gh (6.4 KB)

I’m using this script to create mesh pipes.

[lander (CAD CAM CNC)]

How do I apply this to curves though …

Multipipe gives sharp spikes

Try to solve the Multipipe spikes v2.gh (1.1 MB) Solved this problem by eliminating the spikes in the base mesh. [image]

[lander (CAD CAM CNC)]

@martinsiegrist

I’m using this script to create mesh pipes.

interesting, so do I worry about the intersections, or do I just shrinkwrap it

[martinsiegrist]

Just shrinkwrap it.

[lander (CAD CAM CNC)]

@lander

looking forward to smoothing this out some and converting back to subD

this is so cool

mesh pipes w shrinkwrap in grasshopper huge props @martinsiegrist

[martinsiegrist]

@lander

looking forward to smoothing this out some and converting back to subD

In theory you can Quad Remesh the result but I’m not sure if that leads to a nice SubD…

This approach with Mesh Pipes and Shrinkwrap is more of a quick approach that leads to a similar shape like Multipipe, but without having to do any tweaking to the curves.

[lander (CAD CAM CNC)]

@martinsiegrist

In theory you can Quad Remesh the result but I’m not sure if that leads to a nice SubD…

I believe it’s possible it can work well. I’m confident I could do it manually from here in Rhino commands. If GH is slightly different result I’m sure it can get better.

I hope GH can do it automation-wise though, cause this is awesome!

I just have to figure out GH remesh settings lol

[martinsiegrist]

Post some screenshots of the result…

[lander (CAD CAM CNC)]

looks rough atm, not seeing setting for subd, maybe adding component brb

looks good now, got it converted to subd:

I think these are very good results, for what I’ve been looking for.

There is that proverbial spiral parms effect though in the subd haha.

I like the results though, good signs here in this workflow.

[martinsiegrist]

SubD from Mesh

[lander (CAD CAM CNC)]

awesome GH is the best CAD just got to make sure devs keep making components for everything

Now I need to find that thread how to reduce the ‘spiral effect’ on the parms lol

But I can probably just hide the parms. haha

I’ll make a sample file brb

The sample spirals much less lol:

can’t share whole logo cause top secret
mesh_pipe_from_martin_siegrist_testing.gh (19.3 KB)

I’m very happy with the results of this workflow you’ve helped me learn more about.

I’ve spent many hrs doing this manually, but this new recipe in GH is going to make it much more feasible – also gets me access to higher detail. And I see lots of room for growth here.