Polygonal surface

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  rbaek Moderator, Onshape Employees, Developers Posts: 77

  March 2016

  Dega said:

  Sorry for the dumbest question ever, had a look in the forum without success.
  How can I get a simple polygonal surface?
  For ex. I sketch an hexagon and I want a closed polygonal surface with no thickness.
  

  Let's first start with the sketch:
  
  From here, click on Extrude. In the Extrude dialog, select the Surface option and select the edges of the hexagon:
  
  After selecting them, adjust the extrude type and depth. You will have your hexagon as a surface:
  
  

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  chris_8 OS Professional Posts: 102 PRO

  March 2016

  rbaek said:

  Dega said:

  Sorry for the dumbest question ever, had a look in the forum without success.
  How can I get a simple polygonal surface?
  For ex. I sketch an hexagon and I want a closed polygonal surface with no thickness.
  

  Let's first start with the sketch:
  
  
  

  
  I was hoping for a slightly different answer to this question.   Sometimes I'd like to have a  surface in a certain shape (like maybe the shape of a flat hexagon).   
  
  How can I turn that hexagon into a single flat surface (one that's listed as a surface on the left sidebar)
  

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  DriesV Member, Developers Posts: 43 ✭✭

  March 2016 edited March 2016

  Split with surfaces does the trick.
  https://cad.onshape.com/documents/57487900676117b665eb1216/w/aab023256785150a9d8954d0/e/4fe478616ee226b05fe15f33
  
  A planar surface feature would be nice. 
  
  Dries

  Product Specialist at Luxion (makers of KeyShot)
  www.keyshot.com
  

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  chris_8 OS Professional Posts: 102 PRO

  March 2016

  Thanks @DriesV !   That's useful .   The idea of extruding a line symmetrically to create the planar surface is something I wasn't coming up with myself 

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  NeilCooke Moderator, Onshape Employees Posts: 5,362

  March 2016

  Hi @Dega  - can I ask how you will use this feature? You should always work with solid bodies where possible.
  

  Senior Director, Technical Services, EMEAI

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  DriesV Member, Developers Posts: 43 ✭✭

  March 2016

  NeilCooke said:

  Hi @Dega  - can I ask how you will use this feature? You should always work with solid bodies where possible.
  

  I tend to use planar surface geometry for rendering in KeyShot. They are very useful as geometry for area lights, because then you can define whether the light should output from the front and/or back from the surface. You can't do this with solids.
  
  Dries

  Product Specialist at Luxion (makers of KeyShot)
  www.keyshot.com
  

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  philip_thomas Member, Moderator, Onshape Employees, Developers Posts: 1,381

  March 2016

  Nothing like a good challenge! Behold my polygonal surface
  
  https://cad.onshape.com/documents/a3ef2793d6f93b6b8c88d173/w/a25db7e050d47b3b4dea36fc/e/afe6505ebf43f7f4397b0b86
  
  
  

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  Philip Thomas - Onshape

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  DriesV Member, Developers Posts: 43 ✭✭

  March 2016

  I created an even simpler version. 
  https://cad.onshape.com/documents/57487900676117b665eb1216/w/aab023256785150a9d8954d0/e/cc08441dd4695b6e099c5333
  

  

  

  

  

  

  Dries

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  Product Specialist at Luxion (makers of KeyShot)
  www.keyshot.com
  

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  Dega Member Posts: 6 ✭

  March 2016

  NeilCooke said:

  Hi @Dega  - can I ask how you will use this feature? You should always work with solid bodies where possible.
  

  I wanted to achieve this.
  Thanks for the answer but I was hoping for something simpler
  

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  Narayan_K Member Posts: 379 ✭✭✭

  March 2016

  @ Dega , I created Surface as DriesV  mentioned and patterned it as below,
  
  
  https://cad.onshape.com/documents/52cc9108ce78e7f5e3a55619/w/cccd532887439925da9f8b9f/e/5468dd3d342230c3fbd2474a
  
  
  

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  Dega Member Posts: 6 ✭

  March 2016

  DriesV said:

  I created an even simpler version. 
  https://cad.onshape.com/documents/57487900676117b665eb1216/w/aab023256785150a9d8954d0/e/cc08441dd4695b6e099c5333
  

  
  

  
  

  

  
  

  
  

  Dries

  How did you use the edges of the extrusion as reference?
  

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  Narayan_K Member Posts: 379 ✭✭✭

  March 2016 edited March 2016

  @ Dega , Use Extrude end condition as "Up to next".
  

  3.PNG 46.8K

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  Dega Member Posts: 6 ✭

  March 2016

  philip_thomas said:

  Nothing like a good challenge! Behold my polygonal surface
  
  https://cad.onshape.com/documents/a3ef2793d6f93b6b8c88d173/w/a25db7e050d47b3b4dea36fc/e/afe6505ebf43f7f4397b0b86
  
  
  

  Thanks but I have no idea how you achieved that.
  I tried to loft the edges with the central point but the model disappeared.
  

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  DriesV Member, Developers Posts: 43 ✭✭

  March 2016

  Dega said:

  philip_thomas said:

  Nothing like a good challenge! Behold my polygonal surface
  
  https://cad.onshape.com/documents/a3ef2793d6f93b6b8c88d173/w/a25db7e050d47b3b4dea36fc/e/afe6505ebf43f7f4397b0b86
  
  
  

  Thanks but I have no idea how you achieved that.
  I tried to loft the edges with the central point but the model disappeared.
  

  I you look closely then you can see the point for the loft was put on a plane with a tiny offset.
  Technically, this is not a hexagon, as it is not a single flat face. These are rather 6 triangles glued together at a very shallow angle.
  
  Dries

  Product Specialist at Luxion (makers of KeyShot)
  www.keyshot.com
  

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  NeilCooke Moderator, Onshape Employees Posts: 5,362

  March 2016

  
  
  
  Create your polygon sketch, create two more sketches on the same plane, and "use" one side of your polygon in each, then loft between. Simples.

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  Senior Director, Technical Services, EMEAI

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  rbaek Moderator, Onshape Employees, Developers Posts: 77

  March 2016

  I see, I misunderstood the question. Sorry for the confusion.

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  Dega Member Posts: 6 ✭

  March 2016 edited March 2016

  
  

  Narayan_K said:

  @ Dega , Use Extrude end condition as "Up to next".
  

  @Narayan_K understood, but I meant how can I draw the line using the edges as external reference?
  
  edit.
  I managed to do it, but is not a part and I cannot use it in assembly.
  

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  Dega Member Posts: 6 ✭

  March 2016 edited March 2016

  NeilCooke said:

  
  
  
  Create your polygon sketch, create two more sketches on the same plane, and "use" one side of your polygon in each, then loft between. Simples.

  @NeilCooke
  your solution seems pretty easy! I will give a try!
  
  edit:
  I managed to do the same, but I cannot get a part out of it and then I cannot use the file in an assembly. Is there a workaround?
  https://cad.onshape.com/documents/1c8dd6954290ff5ef4ba383f/w/debdbd6dc7c15543b2583ac3/e/1287456660024ee7f47c9140
  
  
  
  
  

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  NeilCooke Moderator, Onshape Employees Posts: 5,362

  March 2016

  Currently you can't knit surfaces together and you can't turn surfaces into a solid (and you can't use surfaces in assembly). Thicken each surface by a small amount then boolean the resultant solids together.

  Senior Director, Technical Services, EMEAI

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