| Is Shapeways 3D preview accurate? [message #38798] Fri, 18 November 2011 04:47 UTC |
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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:
Attachment: sketchup.jpg
(Size: 82.40KB, Downloaded 373 time(s))
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| Re: Is Shapeways 3D preview accurate? [message #38811 is a reply to message #38798 ] Fri, 18 November 2011 13:47 UTC |
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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.
The Mad Moder
michael@shapeways.com
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| Re: Is Shapeways 3D preview accurate? [message #38912 is a reply to message #38811 ] Sun, 20 November 2011 10:13 UTC |
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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 
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| Re: Is Shapeways 3D preview accurate? [message #38927 is a reply to message #38798 ] Sun, 20 November 2011 19:21 UTC |
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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.
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| Re: Is Shapeways 3D preview accurate? [message #39156 is a reply to message #39155 ] Wed, 23 November 2011 20:43 UTC |
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Attached is the STL file of that second object.
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| Re: Is Shapeways 3D preview accurate? [message #39173 is a reply to message #38798 ] Wed, 23 November 2011 23:44 UTC |
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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.
The Mad Moder
michael@shapeways.com
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| Re: Is Shapeways 3D preview accurate? [message #39181 is a reply to message #39173 ] Thu, 24 November 2011 00:41 UTC |
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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.
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| Re: Is Shapeways 3D preview accurate? [message #39251 is a reply to message #39181 ] Fri, 25 November 2011 05:53 UTC |
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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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