Rounded ends for Sweep1 object

[jajandio]

Hi! I’m trying to create an “organic” looking furniture. I’m using Sweep1, and getting this result:

How can I go about makind the ends rounded instead of being cut at the last cross section curve?
Back in the day I used T-Splines, but I can’t even remember how I did that…
Fillet edge of course doesn’t work.

Thanks!
bench.3dm (396.9 KB)

[rudolf.neumerkel (Rudi)]

Hey @jajandio,

just posted about a similar issue yesterday (doing the same thing with Grasshopper):

Blending/Capping Lofts [Part 2]

There already is a great thread regarding the topic of continuously capping irregular shapes: There are some great methods mentioned, but there are two things that I am looking for: A method that works in Grasshopper and that works with curved lofts as well - as can be seen in the screenshot. [Loft_Blend] I already tried extracting Iso-Curves in Grasshopper and somehow blending them to a given point and then creating a network surface, but the results are not usable: [zebra] Also, the …

In thread you’ll probably find what you are looking for (probably BlendSrf of two halves of the surface):

Quickly Capping Pipes

I’m looking for a way to quickly cap pipes. The pipe does not need to be a perfect circle, so feel free to alter the creation of the pipe if it makes creating the cap easier/smoother. The goal is a smooth cap for rendering. I’m hoping for a general process that works for round(ish) pipes, soft squares/trianlges/etc. I’ve attached some sample shapes and the cons of using a particular command. Pipe Caps.3dm (352.1 KB)

[pascal (Pascal Golay)]

Hello - is something like this about what you are looking for?

-Pascal

[jajandio]

Hi Pascal! that’s using Patch right? That’s near what I want, but I would want it to be more exagerated.
The BlendSrf method that Rudi mentioned here Quickly Capping Pipes would be perfect, but I can’t get it to work

[jajandio]

Thanks for this! lot’s of methods, I’ll see if I can get one of them to work

[pascal (Pascal Golay)]

Hello - yeah, there is quite a lot of leeway -

The idea is you make your sweep from cross sections that are single splines, all the same, resulting in a simple editable surface - then you can round the ends by setting all the points - the entire ‘ring’ at the end to the middle of the next ring of points. i.e. collpase these to a single point. You can do quite a bit of iterative editing until you like what you see, and the ends will stay smooth as long as the sigularity stays in plane with the next ring of points.
bench_Maybe.3dm (152.2 KB)

-Pascal

[jajandio]

Thanks a lot pascal, that’s perfect!
What method did you used to make my cross sections single splines?
Also, I’ve opened the file you attached but I don’t see the points you used to generate that closed surface. If I do a sweep1 with the curves in the files, I get an open ended surface… then what did you do?
Thank a lot for your time!

[pascal (Pascal Golay)]

Hello - to make this trick work:

1. It is much better if the sweep is a single surface, not a polysurface, though you could manage with a polysurface, it would be more painful. So, make all the curves the same single spline - you can get away with this because your shape is soft and organic. What I did was look at the most complex shape - the two middle curves. I exploded these and found that the main part of the shape was a single spline. I used `ContinueCurve1 to keep drawing that curve to match the segments in the original.
   When that looked correct, I copied it to the second location. Then, I selected the two end curves and used Rebuild > Select master curve and selected the curve I had ‘fixed’ Now all curves have exactly the same structure. Sweep1 makes a single, relatively simple, surface.

2. To close the ends, turn on control points for the surface. Select a ring of points at one end. Start SetPt > X,Y,Z and snap to a location in the middle of the next ring of points - the Point and Between Osnaps can be used here. The ring of points will collapse to a ‘singularity’ in place with the second ring of points. Now, to make adjustments, move points around but just make sure that second ring of points stays planar and the singularity says in that plane, some place in the middle of the ring.

-Pascal