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inverse normals [message #67255] Wed, 01 May 2013 15:01 UTC Go to next message
avatar cmcmorel  is currently offline cmcmorel
Messages: 4
Registered: March 2013
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I'm a student in architecture and the attached file is an attempt to create part of my physical model - the part I would have a hard time building with sticks or wire or chipboard.
Using Netfabb, I've worked manually to reverse the normals of the red faces. Now I'm left with the red faces on the helical truss, but the amount of work to reverse all these tiny faces is tremendous and I was wondering if you knew of a software that can do that for me. Netfabb identifies all these faces and colors them red, why can't it reverse them as well?
The trick on that helical truss is that it's made of hollow tubes so there might be inverse normals within the truss itself but I can't see them.
I'm happy to turn that truss into a filled tube (or rod) if that helps with the 3d printing (although I realize it would be more expensive).

I appreciate your help and advice on this matter!

Re: inverse normals [message #67256 is a reply to message #67255 ] Wed, 01 May 2013 15:12 UTC Go to previous messageGo to next message
avatar Youknowwho4eva  is currently offline Youknowwho4eva
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Have you tried Meshlab? Also here's a good read for fixing your model. http://www.shapeways.com/tutorials/how_to_use_meshlab_and_ne tfabb


Your friendly neighborhood Moderman
michael@shapeways.com
Re: inverse normals [message #67282 is a reply to message #67256 ] Wed, 01 May 2013 18:17 UTC Go to previous messageGo to next message
avatar cmcmorel  is currently offline cmcmorel
Messages: 4
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I did use the link and followed the steps, but Netfabb doesn't fix the "invalid orientation". It only colors the faces red. and since my model isn't totally red, it's not helpful.
I used Meshlab in the first step (to convert to stl), but not to fix the model. will try if it's helpfull.

Youknowwho4eva wrote on Wed, 01 May 2013 15:12

Have you tried Meshlab? Also here's a good read for fixing your model. http://www.shapeways.com/tutorials/how_to_use_meshlab_and_ne tfabb

Re: inverse normals [message #67285 is a reply to message #67282 ] Wed, 01 May 2013 19:04 UTC Go to previous messageGo to next message
avatar JACANT  is currently offline JACANT
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Registered: July 2011
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What software did you use to create the original?
It may be easier to fix by someone if you upload the original file.


jacantdesign@gmail.com
Re: inverse normals [message #67286 is a reply to message #67255 ] Wed, 01 May 2013 19:11 UTC Go to previous messageGo to next message
avatar Youknowwho4eva  is currently offline Youknowwho4eva
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Are you sure it's invalid orientation and not self intersections? It doesn't turn red for me till I detect self intersections.


Your friendly neighborhood Moderman
michael@shapeways.com
Re: inverse normals [message #67295 is a reply to message #67286 ] Wed, 01 May 2013 19:43 UTC Go to previous messageGo to next message
avatar stonysmith  is currently offline stonysmith
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Try also running it thru http://cloud.netfabb.com


Patience, Persistance, Politeness - the 3Ps will help us get us to Perfect Printed Products
Re: inverse normals [message #67358 is a reply to message #67285 ] Thu, 02 May 2013 20:23 UTC Go to previous messageGo to next message
avatar cmcmorel  is currently offline cmcmorel
Messages: 4
Registered: March 2013
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I used ArchiCAD.
But I think I figured out what the problems were. I replaced a couple of objects by solid morphs and I think it took care of the problem.
Re: inverse normals [message #67360 is a reply to message #67295 ] Thu, 02 May 2013 20:31 UTC Go to previous messageGo to next message
avatar cmcmorel  is currently offline cmcmorel
Messages: 4
Registered: March 2013
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I just did that after looking for the solution to having too many shells.
I'm finally good with:
-0 Holes
- 0 Border edges
- 0 Invalid orientations
-length of within tolerance
- Closed Surface


However, I'm not sure where to check that I have a Positive Volume.
And I have 108 shells.

I still have many degenerated faces based on the Netfabb view settings.
but it doesn't seems to be a problem from what I read in the tutorial.

thank you all for your help!
I hope it's the end of manipulating that file!
Re: inverse normals [message #67448 is a reply to message #67360 ] Sat, 04 May 2013 22:42 UTC Go to previous message
avatar stop4stuff  is currently offline stop4stuff
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Registered: June 2010
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Sorry, a bit late here. Accutrans3D has a simple 'Preset All' normals function and fixes exactly your original issue in a click, providing there's no other integrity issues,

Paul

 
   
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