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Only back faces display? [message #5782] Tue, 11 August 2009 07:58 UTC Go to next message
avatar philipwh  is currently offline philipwh
Messages: 5
Registered: August 2009
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Here's the model in question.

I uploaded an .stl from Blender and it processed and scaled correctly, was accepted as printable, but both the thumbnail and 3D preview only seem to show the backfaces of the object from any given angle. Has anybody encountered this problem before, and does it mean there is a problem with the model itself that can be fixed? Thanks,

-Philip
Re: Only back faces display? [message #5786 is a reply to message #5782 ] Tue, 11 August 2009 13:01 UTC Go to previous messageGo to next message
avatar WiKKiDWidgets  is currently offline WiKKiDWidgets
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Registered: April 2009
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Hi Phil;

What you are seeing there is an inside out object. hehe. Most likely the issue is that the Normals are all pointed to the inside instead of the outside. (I had the very same issue once.) Easy fix in Blender is to go into edit mode. and select all the verts, then hit {CTRL+N} to recalculate the normals to face outwards.

Re: Only back faces display? [message #5792 is a reply to message #5786 ] Tue, 11 August 2009 19:51 UTC Go to previous messageGo to next message
avatar philipwh  is currently offline philipwh
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Registered: August 2009
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Okay, I just tried that, but now I just get an email saying it wasn't printable because "Your model has inverted normals in it." Which is sort of what I expected given that I wasn't getting a normals error before. Any thoughts?
Re: Only back faces display? [message #5802 is a reply to message #5792 ] Wed, 12 August 2009 11:35 UTC Go to previous messageGo to next message
avatar WiKKiDWidgets  is currently offline WiKKiDWidgets
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Hmmmm....


Sounds like Blender is having problems deciphering inside from outside. Try removing doubled verticies.
If that doesn;t work, PM the .Blend to me and I take a look.
Re: Only back faces display? [message #5804 is a reply to message #5802 ] Wed, 12 August 2009 12:33 UTC Go to previous messageGo to next message
avatar Youknowwho4eva is currently online Youknowwho4eva
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I have had models do this in the software I use. Usually I do a heal and it works. If you software doesn't offer a heal try copying the model into a new drawing and saving the new drawing, or exporting and re import back into the software. Both should cause an automatic solids heal. But seeing the image problem is on shapeways side I would think it would be their software having the issue, but you want it to be right so people can see it properly.


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: Only back faces display? [message #5807 is a reply to message #5804 ] Wed, 12 August 2009 20:14 UTC Go to previous messageGo to next message
avatar philipwh  is currently offline philipwh
Messages: 5
Registered: August 2009
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Junior Member
Well I tried a few different things and have got it working now, I think removing doubles might have been the thing that fixed it but I can't be sure since I did some other little adjustments all at once. Thanks guys.
Re: Only back faces display? [message #5808 is a reply to message #5807 ] Wed, 12 August 2009 20:23 UTC Go to previous message
avatar WiKKiDWidgets  is currently offline WiKKiDWidgets
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Groovy man!

Good job!

 
   
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