Surface creation problem

Rhino
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1

Hello Everyone,

I’m an absolute beginner with Rhino3D and am currently trying to create some models. I come from the SolidWorks, Fusion, and 3ds Max world, and modeling with Rhino is completely new territory for me. I’m stuck at this point and would appreciate your advice.

I’m trying to create a connector for three pipes, and I’ve already managed to create all the surfaces except for this one. The only way I could create this surface was to use “patch,” which actually produces a good result. However, when I try to join the model into a whole, unfortunately it doesn’t work and the surfaces won’t merge. Do you have any ideas?

I want to 3D print the model and need a closed solid for that.

I’m looking forward to your help.

2

screenshot
screenshot1920×1826 240 KB

Sorry, I forgot the screenshot… :sweat_smile:

3

Here is the patch result and when I try to bool it, I get following message: “Intersection curve ends at a naked edge.”

screenshot01
screenshot011600×1386 223 KB

4

Could you share the file? In the meantime, I’ll refer you to this thread about the new Patch command in Rhino 9.

5

Sure, here is the file:

test_connector.3dm (2.3 MB)

6

test_connector_patch1.3dm (3.0 MB)


This new Rhino “Patch” command can be tested by downloading the Work-In-Progress (Rhino 9 WIP) version from this link.
https://www.rhino3d.com/download/rhino/wip/

7

Thank you, Brv!

I tried it in Rhino 9 for my own and it works much better!

Now I can join all together and get a closed model

screenshot RH WIP
screenshot RH WIP2634×2156 150 KB

1 Like
8

Best is to not trying to replicate Fusion or SolidWorks in Rhino, but get used to NURBS surface modelling approaches, maybe this is useful to make the transition. There’s a very simple approach, see below.

Untitled-32
Untitled-321826×1240 1.08 MB

sphere with flanges.3dm (2.1 MB)

2 Likes
9

If the 3 extruded surfaces are exact arcs, then G1 should be used on all sides of the patch to prevent flatter end regions. :smiley:

1 Like
10

It’s mathematically the most correct approach, though most people would prefer a smoother patch surface for its is appearance.

11

The OP’s file shows that the curves are arcs, which means G1 continuity is wanted.

curve  
  
  ID: a354a036-374f-4f6b-ac76-c4d794170398 (70742)
  Object name: (not named)
  Layer name: Default
  Render Material: 
    source = from layer
    index = -1
  
  Geometry:
    Valid curve.
    Arc
      start = (-0.000,-0.500,3.500)
      end = (-0.000,-0.000,3.000)
      center = (-0.000,-0.000,3.500)
      radius = 0.500
      angle = 90 degrees
12

@Lagom I tried a similar solution like yours before, but I don’t like the transition between the surface. The patch version is much smoother and I like it way more.

screenshot zebra 01
screenshot zebra 011562×1398 268 KB

screenshot zebra 02
screenshot zebra 021494×1338 186 KB

13

Well, you did not describe in the OP what kind of result it is you’re after.

The what you call “smoother” alternative can also be built with a standard NURBS surface modelling approach.

1 Like
14

Using @Lagom’s file as a reference, I created a third solution that’s a middle ground between the two previous ones. It also has one point in the middle of the patch surface, so if you scale its position from the other point in the middle, you can adjust the bulge of the patch.

Of course, this is a bad example, because I used the poor “Patch” tool of Rhino 7. Those with access to Rhino 9 WIP could make a much better patch with G1 continuity.

sphere with flanges.3dm (1.1 MB)