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Non-manifold [message #9019] Sat, 16 January 2010 23:02 UTC Go to next message
avatar feilen  is currently offline feilen
Messages: 5
Registered: January 2009
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Okay, I have a model here that I worked on for a few hours clearing up all the manifold errors that blender gave me. Hours later, after clearing it up, checking twice, and uploading, I get an error.

I think it would probably have to be something to do with normals(I made it automate the outwards) but I really have no idea.

Help? :/

  • Attachment: FEILEN.stl
    (Size: 4.72MB, Downloaded 96 time(s))

  • Attachment: FEILEN.blend
    (Size: 4.86MB, Downloaded 83 time(s))

Re: Non-manifold [message #9028 is a reply to message #9019 ] Sun, 17 January 2010 04:27 UTC Go to previous messageGo to next message
avatar GHP  is currently offline GHP
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Registered: October 2009
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The base of your figure had inverted normals. You probably received an e-mail from Shapeways about this.

I opened it in MeshLab (where the inverted faces show as black instead of grey), selected the base, moved it to another layer, inverted the normals for that layer, then flattened the layers into one again. I'm attaching the result. Selecting Ctrl-N in Edit mode in Blender to orient the normals outward would probably have worked also.

From the looks of it, I doubt that the whiskers and possibly some other details will be printable, however. For most materials, a minimum wall thickness of 1mm is recommended.

Re: Non-manifold [message #9029 is a reply to message #9019 ] Sun, 17 January 2010 04:31 UTC Go to previous messageGo to next message
avatar GHP  is currently offline GHP
Messages: 118
Registered: October 2009
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The base of your figure had inverted normals. You probably received an e-mail from Shapeways about this.

I opened it in MeshLab (where the inverted faces show as black instead of grey), selected the base, moved it to another layer, inverted the normals for that layer, then flattened the layers into one again. I'm attaching the result. Selecting Ctrl-N in Edit mode in Blender to orient the normals outward would probably have worked also.

From the looks of it, I doubt that the whiskers and possibly some other details will be printable, however. For most materials, a minimum wall thickness of 1mm is recommended.
Re: Non-manifold [message #9030 is a reply to message #9029 ] Sun, 17 January 2010 04:38 UTC Go to previous messageGo to next message
avatar GHP  is currently offline GHP
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Aaaggh! I thought I was attaching the updated file, but it doesn't seem to have worked. I'll try once more, but if it doesn't work, you can try one of the methods described above. (Sorry about the duplicate reply.)

Re: Non-manifold [message #9031 is a reply to message #9019 ] Sun, 17 January 2010 07:48 UTC Go to previous messageGo to next message
avatar feilen  is currently offline feilen
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Thanks very much!

I tried to force normals out with blender, looks like I didn't catch one.

The base is actually just an extruded circle, so I really had no clue what I was doing there, thanks for fixing it!
Re: Non-manifold [message #9032 is a reply to message #9019 ] Sun, 17 January 2010 07:52 UTC Go to previous messageGo to next message
avatar feilen  is currently offline feilen
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Actually, the error I got was that it was non-manifold.

I get this error again with your modification...
Re: Non-manifold [message #9037 is a reply to message #9019 ] Sun, 17 January 2010 17:01 UTC Go to previous messageGo to next message
avatar feilen  is currently offline feilen
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...And apparently my model has a volume of -42.9 cm^3
Re: Non-manifold [message #9050 is a reply to message #9019 ] Mon, 18 January 2010 00:10 UTC Go to previous messageGo to next message
avatar GHP  is currently offline GHP
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Sorry - MeshLab thought the model was manifold. Blender did find non-manifold areas however. I think Blender (and Shapeways) may use less precision than MeshLab, so vertices that are very close get counted as duplicates. (When checking this in Blender, first select all vertices and remove doubles, preferably with the difference limit set to zero rather than the default of 0.001, then deselect all vertices before using "Select Non-Manifold", because it won't clear the current selection.)

I removed non-manifold vertices in Blender, then used the "Close Holes" feature in MeshLab to patch them, then the "Fill Holes" dialog in MeshLab to put "trivial" patches on several remaining small holes. Some of your whiskers got a bit shorter in the process, but otherwise I didn't see any problems, and Blender now thinks it is manifold.

I checked it in netfabb Studio Basic for flipped normals (which sometimes occur while patching holes), and it found none. It gives the volume as 42.9 cm3. I believe you have several overlapping meshes (or shells). Shapeways (and also netfabb, I think) computes the volumes of the shells separately, then sums them, without adjusting for the places where they overlap, so the computed volume may be quite a bit larger than the actual volume of the model (although your model is actually fairly large, by Shapeways standards).

I hope this helps.

Re: Non-manifold [message #9059 is a reply to message #9019 ] Mon, 18 January 2010 06:01 UTC Go to previous message
avatar feilen  is currently offline feilen
Messages: 5
Registered: January 2009
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Junior Member
THANK YOU!
And I don't think the whiskers will be a problem.
I'm still new at this, hope I don't have to ask for help next time (as if)

 
   
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