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I am new at Blender, I want to design a mesh of a single twisted yarn, which is the best strategy to design this mesh. Sorry if my question sounds dumb.

I am attaching the picture ![enter image description here enter image description here

I foud a tutorial in youtube: https://www.youtube.com/watch?v=cP1pY14fVC4&list=LLuORS2hOBqsUJEgE645iWDQ&index=2&t=1026s, however, I dont know how to merge the mesh.

EDIT Is this mesh true, I am going to use it for physical simulation

enter image description here

Monika
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    please show an image of a single twisted yarn, how is it made exactly, several ropes? etc.. – moonboots Sep 30 '19 at 13:33
  • @moonboots, I am attaching the picture. – Monika Oct 01 '19 at 18:05
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    please tell me if that answer helps: https://blender.stackexchange.com/questions/114563/how-to-create-twisted-wires-in-blender/114566#114566 – moonboots Oct 02 '19 at 05:05
  • Thanks so much, yes, indeed, I found a similar video earlier: https://www.youtube.com/watch?v=xYhIoiOnPj4. Indeed thanks for the help. – Monika Oct 02 '19 at 07:59
  • @moonboots, i am trying to follow this tutorial, which create twisted yarn, https://www.youtube.com/watch?v=cP1pY14fVC4, at minute: 16:50, I cannot replicate it, please see picture above, I dont know why they dont merge – Monika Oct 03 '19 at 10:25
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    you need to enable the Snap option (magnet icon) / vertex mode, (or press ctrl to enable the Snap while you move your mesh) and also the Auto Merge option, which, in 2.8, is in the 3D view N panel (top right) > Tools > Options, tell me if it works – moonboots Oct 03 '19 at 10:40
  • Maybe you don't say enough, do they snap? If they do, they won't merge as long as you don't enable the auto-merge option, if you've enabled auto-merge I don't know what's the problem, maybe share your file – moonboots Oct 03 '19 at 13:30
  • I am doing it again,if it did not work, I would share my file, thanks so much for help. – Monika Oct 03 '19 at 13:31
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    also, make sure you're in Vertex select mode – moonboots Oct 03 '19 at 13:35
  • @moonboots, i ididnot work, after extruding, the mesh isnot converging, although I made sure to snap vertices by holding shift and move, I dont know what is the problem I missing, I am attaching the file, hope you could help me. – Monika Oct 06 '19 at 16:40
  • @moonboots, I am adding the file in the question part, thanks. – Monika Oct 06 '19 at 16:41
  • You didn't enable the Auto-Merge option (N panel > Tool > Options > Auto-Merge, but anyway, your shape is not symmetrical, so it won't twist properly, I'm going to make a full answer – moonboots Oct 06 '19 at 16:58

1 Answers1

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  • Create a 12 vertices circle.

enter image description here

  • Enable the Snap option (Vertex mode), or just press ctrl when you'll need it, enable the Auto-Merge option.

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  • Duplicate your circle, with Snap and Auto-Merge it will snap and merge the vertices. Delete the inner vertices, bevel the 3 central vertices with a shiftctrlB.

enter image description here

  • Extrude up, create horizontal edge loops with ctrlR. To make sure you don't have flipped normals, press shiftctrlN. Back in Object mode, move the origin to the geometry.

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  • Give your object a Simple Deform modifier, Angle 120°, Axis Z.

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  • Give it an Array modifier, enable the Merge and First Last options.

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  • Give it a Subdivision Surface modifier, and also smooth it: Object > Shade Smooth.

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  • To make it follow a curve, give it a Curve modifier. Make sure that the curve's origin is at its beginning, put the object at the same point.
moonboots
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  • Thanks so much, the automerge isnot appearing in 2.8 blender , can I use ctrl+j. I am using mac. I am adding the figure in the description. – Monika Oct 06 '19 at 20:13
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    I'm also on Mac, Auto-Merge should appear once in Edit mode, are you in Edit mode? – moonboots Oct 06 '19 at 20:17
  • Sorry, I am very dumb as I am still new user in blender, yes, it works, thanks. – Monika Oct 06 '19 at 20:18
  • I am stuck at the point of extruding up, I know to create a loop ctrl+N. I am adding the picture in description – Monika Oct 06 '19 at 20:57
  • Ctrl R to create new edge loop(s), but you should not completely reedit your question, please reintroduce the initial question and images – moonboots Oct 06 '19 at 21:02
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    Plus, if you're not familiar yet with basic blender operations you should work on some beginners tutorials ;) – moonboots Oct 06 '19 at 21:03
  • I am going to use this mesh for physical simulation and it seems array modifier doesnot capture the vertices and edges, no mesh data point – Monika Oct 06 '19 at 23:45
  • Please see the mesh in question description, is this mesh true? – Monika Oct 07 '19 at 00:34
  • What do you mean by "true"? Maybe share your file so that we can check – moonboots Oct 07 '19 at 06:44
  • I mean whether there is an actual mesh data point where I can use it for physics-based simulation. Here is the file on my google drive: https://drive.google.com/open?id=1UaeUTAr1J19QiWW2EnMmJqFRVxtPdx40 – Monika Oct 07 '19 at 07:35
  • Not sure about your second Simpledeform, what is it for? Maybe what you should use is a Subdivision Surface modifier to smooth it, and also Object > Shade Smooth. But once you're glad with your object you can use it for physics, of course. – moonboots Oct 07 '19 at 07:52
  • Yes, there are two, maybe added by mistake,but when I follow up with your steps,there is no actual mesh in the array, so I did manually by rotating the actual mesh, I dont know why the edit mode gives the mesh data point different from the object mode, I am really confused. – Monika Oct 07 '19 at 08:21
  • The mesh in stl sounds okay so far, however, the technique of array doesnot really have mesh data point, i did this one by accident, i dont know how I extended the mesh in rotation. This technique in minute: 18:40, in this tutorial: https://www.youtube.com/watch?v=cP1pY14fVC4&list=LLuORS2hOBqsUJEgE645iWDQ&index=2&t=1141s. I dont know how to rotate as he did, when I do this step, the vertices intervene. – Monika Oct 07 '19 at 10:43
  • thanks so much, it was the fourth button of subdivide surface not pressed. – Monika Oct 08 '19 at 10:17
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    at 18:40 he uses the Proportional Editing option (little blue sphere icon) with the Linear setting, but the Simple Deform modifier is more precise – moonboots Oct 08 '19 at 10:32
  • I did it, I will try. A side question: How can convert the STL mesh to VTK Mesh in blender? – Monika Oct 08 '19 at 10:49
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    Sorry I don't know anything about these formats so I can't answer – moonboots Oct 08 '19 at 10:57
  • I had another problem, I am trying to export a simple shape for testing my code, the exported is in OBJ format. Blender gives me an error that location is unknown or something related to volume, I just use simple shapes like sphere and ball. I increase the scale to100 while exporting and still the same error. Do you have any idea why I cannot get the OBJ mesh. – Monika Oct 08 '19 at 15:32
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    Maybe create a new question as it is a completely different issue ;) – moonboots Oct 08 '19 at 15:43