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Is Shapeways 3D preview accurate? [message #38798] Fri, 18 November 2011 04:47 UTC Go to next message
avatar volundr  is currently offline volundr
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I made a signet ring with an engraved design in SketchUp. The engraved bit shows up fine in SketchUp and exported (as OBJ) in AccuTrans. However, on Shapeways site, in 3D preview, I cannot see the engraving so I am wondering if it will show up on the actual item.

Any thoughts?

SketchUp image:

index.php?t=getfile&id=12129&private=0

  • Attachment: sketchup.jpg
    (Size: 82.40KB, Downloaded 389 time(s))

Re: Is Shapeways 3D preview accurate? [message #38799 is a reply to message #38798 ] Fri, 18 November 2011 04:51 UTC Go to previous messageGo to next message
avatar volundr  is currently offline volundr
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AccuTrans image:

index.php?t=getfile&id=12130&private=0

  • Attachment: accutrans.jpg
    (Size: 97.02KB, Downloaded 369 time(s))

Re: Is Shapeways 3D preview accurate? [message #38800 is a reply to message #38799 ] Fri, 18 November 2011 04:54 UTC Go to previous messageGo to next message
avatar volundr  is currently offline volundr
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Shapeways image:

index.php?t=getfile&id=12131&private=0

  • Attachment: shapeways.jpg
    (Size: 45.43KB, Downloaded 368 time(s))

Re: Is Shapeways 3D preview accurate? [message #38811 is a reply to message #38798 ] Fri, 18 November 2011 13:47 UTC Go to previous messageGo to next message
avatar Youknowwho4eva  is currently offline Youknowwho4eva
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I want to say I see the image upside down on there. Without seeing the model, I'd say it's probably overlapping geometry (touching faces, not inside one another) or inverted normals. It looks like in sketchup, you have the emblem as a seperate piece as the ring, and that it's sitting perfectly nested. If that's true, I'd either extend the emblem faces so they extend into the ring, or join them.


I learned a long time ago the wisest thing I can do is be on my own side, be an advocate for myself and others like me. -Maya Angelou
michael@shapeways.com Community Advocate
Re: Is Shapeways 3D preview accurate? [message #38912 is a reply to message #38811 ] Sun, 20 November 2011 10:13 UTC Go to previous messageGo to next message
avatar berky93  is currently offline berky93
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Shapeways seems to have a hard time handling N-gons with holes in them. Because the face of the ring is a single shape with the design cut out of it, it creates geometry that the site automatically fills in while attempting to make sense of what it sees. Simply adding an edge that extends from the edge of the front face to the edge of one of the objects, and more edges to connect all of the objects, should give it definable polygons that it can understand.

I hope I put that in a way that is easy to understand, I can never tell Confused
Re: Is Shapeways 3D preview accurate? [message #38927 is a reply to message #38798 ] Sun, 20 November 2011 19:21 UTC Go to previous messageGo to next message
avatar volundr  is currently offline volundr
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I ended up removing some duplicate edges and raising the whole engraving part up a little. It showed up better on the preview this way. We'll see how it actually turns out.
Re: Is Shapeways 3D preview accurate? [message #39154 is a reply to message #38927 ] Wed, 23 November 2011 20:39 UTC Go to previous messageGo to next message
avatar volundr  is currently offline volundr
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Having a similar issue with another model. Exported it to STL this time, shows up correctly in a variety of 3D viewers (e.g. Accutrans), but different on Shapeways website.


Accutrans view:
index.php?t=getfile&id=12273&private=0

  • Attachment: accutrans.jpg
    (Size: 83.05KB, Downloaded 259 time(s))

Re: Is Shapeways 3D preview accurate? [message #39155 is a reply to message #39154 ] Wed, 23 November 2011 20:41 UTC Go to previous messageGo to next message
avatar volundr  is currently offline volundr
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Shapeways viewer (note how the back has weird new triangles instead of smooth surface and circular indent in the center):

index.php?t=getfile&id=12274&private=0

  • Attachment: browser.jpg
    (Size: 65.31KB, Downloaded 259 time(s))

Re: Is Shapeways 3D preview accurate? [message #39156 is a reply to message #39155 ] Wed, 23 November 2011 20:43 UTC Go to previous messageGo to next message
avatar volundr  is currently offline volundr
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Attached is the STL file of that second object.

Re: Is Shapeways 3D preview accurate? [message #39163 is a reply to message #39156 ] Wed, 23 November 2011 21:28 UTC Go to previous messageGo to next message
avatar berky93  is currently offline berky93
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I ran an stl check on your object in 3ds max and found a lot of errors. It looks like the way you modeled it was using booleans or some other method that produced a lot of intersecting polygons and n-gons (polygons with more than 4 sides) as well as concave surfaces and some odd triangulation. It's important to make sure you have proper geometry, especially when 3d printing.

index.php?t=getfile&id=12276&private=0

I recommend opting to start your models with low polygon counts and then protecting your edges so that subsequent smoothing operations give both sharp edges and proper, smooth curves. This will ensure your models are manifold and have proper geometry.

  • Attachment: errors.jpg
    (Size: 600.51KB, Downloaded 257 time(s))

Re: Is Shapeways 3D preview accurate? [message #39168 is a reply to message #39163 ] Wed, 23 November 2011 22:42 UTC Go to previous messageGo to next message
avatar volundr  is currently offline volundr
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The model was designed in SketchUp. It is very simple: mostly flat walls and a couple of curves for the lens. What the export/import does to these models is mind-boggling.

index.php?t=getfile&id=12278&private=0

Re: Is Shapeways 3D preview accurate? [message #39169 is a reply to message #38798 ] Wed, 23 November 2011 22:51 UTC Go to previous messageGo to next message
avatar volundr  is currently offline volundr
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Another view of the STL file (from Rhino 4). Looks fine here too.

index.php?t=getfile&id=12279&private=0

  • Attachment: rhino.jpg
    (Size: 28.46KB, Downloaded 222 time(s))

Re: Is Shapeways 3D preview accurate? [message #39173 is a reply to message #38798 ] Wed, 23 November 2011 23:44 UTC Go to previous messageGo to next message
avatar Youknowwho4eva  is currently offline Youknowwho4eva
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Your file "looks" fine in KeyCreator as well. But you have internal polygons. There are faces inside that will cause errors.


I learned a long time ago the wisest thing I can do is be on my own side, be an advocate for myself and others like me. -Maya Angelou
michael@shapeways.com Community Advocate
Re: Is Shapeways 3D preview accurate? [message #39181 is a reply to message #39173 ] Thu, 24 November 2011 00:41 UTC Go to previous messageGo to next message
avatar berky93  is currently offline berky93
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Oh, yes, the model looked just fine in max. It was only after I ran an stl check that problems were evident (although by by simply looking at the wireframe you could see how the geometry sketchup exported has the potential to cause issues).

The thing about sketchup is, because it is so simple and intuitive it doesn't give you a lot of control over the underlying geometry behind a shape. You can have huge n-gons or double faces with no problems in the program but issues upon export.
Re: Is Shapeways 3D preview accurate? [message #39251 is a reply to message #39181 ] Fri, 25 November 2011 05:53 UTC Go to previous message
avatar volundr  is currently offline volundr
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Well, I worked on this model for a while and I think it is in better shape now. Can someone please run a STL check for me to see if I goofed up somewhere?

Many thanks!


 
   
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