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icon5.gif  Need help with SketchUp obj to stl [message #52495] Sat, 11 August 2012 20:23 UTC Go to next message
avatar lensman  is currently offline lensman
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I rarely use SketchUp for modeling but have recently tried it again. I essentially have a model which is a column of varying widths. Down the centre of the column is a hole - in the middle the width of the hole changes.

I can export the model in OBJ format and import into Rhino or MiniMagics where it looks fine, however, when I export as an STL from Rhino and upload to Shapeways the hole down the middle of the column is completely closed in (the faces on either end of the column are solid).

Even uploading as an OBJ from SketchUp produces the same result.

Why, then does the model look as it should in Rhino or MiniMagics, and Meshlab?

Glenn


Glenn ------ My Website Third Dimension Jewellery
Re: Need help with SketchUp obj to stl [message #52500 is a reply to message #52495 ] Sat, 11 August 2012 23:56 UTC Go to previous messageGo to next message
avatar stop4stuff  is currently offline stop4stuff
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I'm having a half guess here, but my guess is based on looking at sketchup models, it has something to do with how the normals are applied to create mesh psuedo boolean additions or subtractions 'on-the-fly' for visual effects.

How does the model look if you export as an stl from MeshLab and load it into NetFabb?

Re: Need help with SketchUp obj to stl [message #52503 is a reply to message #52500 ] Sun, 12 August 2012 01:46 UTC Go to previous messageGo to next message
avatar Fredd  is currently offline Fredd
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It could possibly be ngons causing the problems. Mesh lab allows some really complicated mesh techniques, while netfabb has a hissy fit if it detects anything wrong.(similar to SW's rejection mode.)


Have any questions regarding Blender, and need fast answers, you are always welcome at the IRC Server Freenode, channel #blender. As a bonus, several there have experience in modelling for 3D prints.

Keith
Re: Need help with SketchUp obj to stl [message #52505 is a reply to message #52495 ] Sun, 12 August 2012 03:35 UTC Go to previous messageGo to next message
avatar lensman  is currently offline lensman
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@shop4stuff - In Netfabb although the whole geometry looks funky (lots of triangles) at least the hole is there.

@Fredd - Yeah, now I remember why I gave up modelling with SketchUp; things look fine in the programme but in reality there can be mega problems with flipped normals and messy geometry...

Glenn


Glenn ------ My Website Third Dimension Jewellery
Re: Need help with SketchUp obj to stl [message #52507 is a reply to message #52495 ] Sun, 12 August 2012 09:36 UTC Go to previous messageGo to next message
avatar denali3ddesign is currently online denali3ddesign
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I would try exporting to stl directly from sketchup with this plugin: http://www.guitar-list.com/download-software/convert-sketchu p-skp-files-dxf-or-stl

I use it all the time without any trouble.


Trouble using SketchUp? Get my book "3D Printing with SketchUp" - http://bit.ly/1jQ4RtV
Re: Need help with SketchUp obj to stl [message #52511 is a reply to message #52495 ] Sun, 12 August 2012 13:45 UTC Go to previous messageGo to next message
avatar lensman  is currently offline lensman
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Thanks, Marcus. I have a plug-in in SketchUp for this (discovered after my first post!) but even that fails. I think it is inherent problems with the geometry, really. While building the column I did a lot of pulling of the outside edge of the circle making it smaller or larger (with the damn tool I can't remember the name of now and don't have SketchUp on this computer) before building the column higher. I'm sure that had something to do with it.

I tried a simple test with a plain column with a hole through the length and that worked fine.

I've moved on to modeling it in another programme now...

SketchUp models look great and the programme is relatively nice to use, but unless you are very careful you can end up with a real mess in the geometry.

Glenn


Glenn ------ My Website Third Dimension Jewellery
Re: Need help with SketchUp obj to stl [message #52536 is a reply to message #52511 ] Mon, 13 August 2012 08:13 UTC Go to previous messageGo to next message
avatar denali3ddesign is currently online denali3ddesign
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Yeah, its easy to make a mess if you're not familiar with the program.

Can you share an image of the column you were trying to make?


Trouble using SketchUp? Get my book "3D Printing with SketchUp" - http://bit.ly/1jQ4RtV
Re: Need help with SketchUp obj to stl [message #52540 is a reply to message #52495 ] Mon, 13 August 2012 13:15 UTC Go to previous messageGo to next message
avatar lensman  is currently offline lensman
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Here is the "column" now modelled in another programme.

index.php?t=getfile&id=19556&private=0






Glenn ------ My Website Third Dimension Jewellery
Re: Need help with SketchUp obj to stl [message #52739 is a reply to message #52507 ] Fri, 17 August 2012 00:14 UTC Go to previous messageGo to next message
avatar MobiusMagnetic  is currently offline MobiusMagnetic
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denali3ddesign wrote on Sun, 12 August 2012 09:36

I would try exporting to stl directly from sketchup with this plugin: http://www.guitar-list.com/download-software/convert-sketchu p-skp-files-dxf-or-stl

I use it all the time without any trouble.


Hi, I am new to shapeways, I am also using SketchUp 8, this plugin looks great but it trys to install default IE pages and other software that I do not trust. SketchUp Pro will allow these conversions out of the box. I am going to download the trial version to see if it works better, I am having similar issues.
Re: Need help with SketchUp obj to stl [message #54797 is a reply to message #52739 ] Wed, 03 October 2012 15:20 UTC Go to previous messageGo to next message
avatar beagley  is currently offline beagley
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Hi! Could you report back RE Sketchup Pro's export to STL? Curious.
Re: Need help with SketchUp obj to stl [message #54828 is a reply to message #54797 ] Thu, 04 October 2012 01:18 UTC Go to previous message
avatar denali3ddesign is currently online denali3ddesign
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beagley wrote on Wed, 03 October 2012 15:20

Hi! Could you report back RE Sketchup Pro's export to STL? Curious.

Sketchup Pro doesn't export STL without a plugin.

I use this plugin - it works with either the free or Pro version of Sketchup: http://www.guitar-list.com/download-software/convert-sketchu p-skp-files-dxf-or-stl

I haven't had any trouble with it installing anything extra - if you're getting extra stuff, look over the installation instructions just down a ways on the page.

Hope that helps!

[Updated on: Thu, 04 October 2012 01:21 UTC]


Trouble using SketchUp? Get my book "3D Printing with SketchUp" - http://bit.ly/1jQ4RtV

 
   
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