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facets in stl [message #24571] Tue, 08 March 2011 03:33 UTC Go to next message
avatar edge  is currently offline edge
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hi,

In my stl file that was created from Rhino 3d, I see facets although the native model is all smooth. Is this typical?

I set the polygon resolution very fine. The folks at Rhino said to set the stl mesh resolution to match the 3D printer resolution.

Any tips?

Anyone know the Shapeways rapid prototyping machine resolution?

Thanks
Re: facets in stl [message #24610 is a reply to message #24571 ] Tue, 08 March 2011 18:50 UTC Go to previous messageGo to next message
avatar Youknowwho4eva  is currently offline Youknowwho4eva
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You can check the material resolutions on their individual pages (under support, under materials on the top bar) Rhino uses Nurbs to model. STL uses polygons (each surface is created by a 2D triangle of mesh) so it has the faceted effect you mention.


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Re: facets in stl [message #24614 is a reply to message #24610 ] Tue, 08 March 2011 20:04 UTC Go to previous messageGo to next message
avatar edge  is currently offline edge
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I checked with Rhino, they said to match the .stl resolution to the Rapid Prototyping printer resolution and the facets will not show up in the model.
Re: facets in stl [message #24617 is a reply to message #24571 ] Tue, 08 March 2011 20:15 UTC Go to previous messageGo to next message
avatar Youknowwho4eva  is currently offline Youknowwho4eva
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That is correct. But having such high resolution means more polys so you have to remember to keep under the 500K poly limit.

[Updated on: Wed, 09 March 2011 18:21 UTC]


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Re: facets in stl [message #24621 is a reply to message #24617 ] Tue, 08 March 2011 20:25 UTC Go to previous messageGo to next message
avatar edge  is currently offline edge
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I sent in a file that was 1,946KB (almost 2MB) and the system took it in and quoted it.

If I order a print will the system somehow down size it to 50KB?

[Updated on: Tue, 08 March 2011 20:26 UTC]

Re: facets in stl [message #24624 is a reply to message #24571 ] Tue, 08 March 2011 20:36 UTC Go to previous messageGo to next message
avatar Youknowwho4eva  is currently offline Youknowwho4eva
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No no no Laughing 500K polys as it 500,000 polygons. If you've uploaded, you are fine as far as file size and poly limits

[Updated on: Wed, 09 March 2011 18:21 UTC]


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Re: facets in stl [message #24645 is a reply to message #24624 ] Wed, 09 March 2011 10:34 UTC Go to previous messageGo to next message
avatar stop4stuff  is currently offline stop4stuff
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Youknowwho4eva wrote on Tue, 08 March 2011 20:36

No no no Laughing 50K polys as it 50,000 polygons. If you've uploaded, you are fine as far as file size and poly limits


500,000 triangles Wink

I just tried a couple of test uploads -
One with 540,000 triangles (polys) = fail
One with 270,000 quad polys (each quad is 2 triangles) = fail.


[edit] @Edge - aim for 0.1 to 0.2mm sizing for your polys


[Updated on: Wed, 09 March 2011 10:35 UTC]

Re: facets in stl [message #24650 is a reply to message #24571 ] Wed, 09 March 2011 13:53 UTC Go to previous messageGo to next message
avatar Youknowwho4eva  is currently offline Youknowwho4eva
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@stop4stuff- it's stated as polys on the upload page so Razz lol. Yes I know it's 500,000 triangles. My stl export exports to triangles, not sure about everyone else. But saying triangles is probably better seeing it would be confusing uploading a 237K poly model and having it rejected once broke down into triangles.

@edge- don't take the laugh wrong, not at you, but at the confusion. I know I can be very confusing at times. Can't wait to see what you've got cooking in it arrived!


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Re: facets in stl [message #24665 is a reply to message #24650 ] Wed, 09 March 2011 17:31 UTC Go to previous messageGo to next message
avatar stop4stuff  is currently offline stop4stuff
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psst.... 50k... 500k...?

Wink


Re: facets in stl [message #24673 is a reply to message #24571 ] Wed, 09 March 2011 18:22 UTC Go to previous message
avatar Youknowwho4eva  is currently offline Youknowwho4eva
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I know not of what you speak I see 500k on all of them... Rolling Eyes I really need to learn to check my facts.


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michael@shapeways.com

 
   
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