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icon5.gif  Parts of model disappeared [message #61282] Sun, 03 February 2013 23:19 UTC Go to next message
avatar mjrbaseball  is currently offline mjrbaseball
Messages: 4
Registered: January 2013
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I am puzzled. When I uploaded the dae file to Shapeways, it was accepted, but parts of it disappeared. What confuses me most is that the parts that are missing are actually thicker than parts that showed up. Why did this happen, and what can I do to correct it?

Here is a link to my model. It is supposed to be a set of bleachers, like at a ballpark. The posts showed up, as did the safety rails, but the seat planks and foot planks are gone.

I can send someone the dae or original Sketchup file if they want to check it out.

Thank you.
Re: Parts of model disappeared [message #61285 is a reply to message #61282 ] Sun, 03 February 2013 23:46 UTC Go to previous messageGo to next message
avatar stonysmith  is currently offline stonysmith
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Registered: August 2008
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Open it in Netfabb basic (www.netfabb.com) and see if those seats have inverted normals.
You might also run it thru cloud.netfabb.com to ensure that it's a single mesh.


Patience, Persistance, Politeness - the 3Ps will help us get us to Perfect Printed Products
Re: Parts of model disappeared [message #61286 is a reply to message #61285 ] Sun, 03 February 2013 23:51 UTC Go to previous messageGo to next message
avatar mjrbaseball  is currently offline mjrbaseball
Messages: 4
Registered: January 2013
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Junior Member
stonysmith wrote on Sun, 03 February 2013 23:46

Open it in Netfabb basic (www.netfabb.com) and see if those seats have inverted normals.
You might also run it thru cloud.netfabb.com to ensure that it's a single mesh.


It is a .dae file, not .stl. Also, I do not know what "inverted normals" means.
Re: Parts of model disappeared [message #61308 is a reply to message #61286 ] Mon, 04 February 2013 11:30 UTC Go to previous messageGo to next message
avatar mkroeker  is currently offline mkroeker
Messages: 2001
Registered: June 2012
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Get meshlab (also free) to convert your dae to stl. You can also check and correct the orientation of the face
normals in this program. Basically if the face vertices are listed in the wrong order, the normal vector pointing
away from that face points to the inside of your object. Such misoriented faces are a sure way to mess up your
model, as the automatic repair that shapeways attempts on upload will throw away those parts that have no
clearly defined outer surface.
Re: Parts of model disappeared [message #62008 is a reply to message #61308 ] Thu, 14 February 2013 01:54 UTC Go to previous messageGo to next message
avatar mjrbaseball  is currently offline mjrbaseball
Messages: 4
Registered: January 2013
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Junior Member
I have Meshlab, but is a very complicated program. Converting the dae to stl did not help. I do not know what face normals are. Where can I learn how to check the factors you mentioned? Or could someone please test my model to help me see what is wrong with it? Thank you,

  • Attachment: stands2HO.stl
    (Size: 3.60MB, Downloaded 12 time(s))

Re: Parts of model disappeared [message #62009 is a reply to message #62008 ] Thu, 14 February 2013 01:57 UTC Go to previous messageGo to next message
avatar mjrbaseball  is currently offline mjrbaseball
Messages: 4
Registered: January 2013
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Junior Member
No Message Body

  • Attachment: stands1HO.stl
    (Size: 4.25MB, Downloaded 13 time(s))

Re: Parts of model disappeared [message #62010 is a reply to message #62009 ] Thu, 14 February 2013 03:09 UTC Go to previous messageGo to next message
avatar stonysmith  is currently offline stonysmith
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Face Normals: every surface on your model is made up of triangles. Pick any triangle A,B,C and (conceptually) lay it on the floor. Then walk from A to B to C. If you are walking in a counter-clockwise direction, then the Face Normal is "up". If you are walking in a clockwise direction, the Face Normal is "down". (This is also called the "right hand rule")

On a 3d model such as a solid cube, you need for all of the face normals to be pointing "outward" from the center. If even one of the face normals points inward, (the corners are in the wrong order) then the model is considered to have a hole in it. Programs such as Netfabb Basic mentioned above can help you find such triangles and flip them so that they are pointing outward.

====
Someone else may be able to chime in here and offer some assistance with Sketchup.. I'm not proficient with it.


Patience, Persistance, Politeness - the 3Ps will help us get us to Perfect Printed Products
Re: Parts of model disappeared [message #62051 is a reply to message #62008 ] Thu, 14 February 2013 14:23 UTC Go to previous message
avatar mkroeker  is currently offline mkroeker
Messages: 2001
Registered: June 2012
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Quick tutorial on using the repair function in netfabb is here (under "Tutorials" in the "Create" menu). I thought there was something similar for meshlab but cannot find it right now (and am in the wrong place now to just start meshlab myself) - I believe the equivalent meshlab function for displaying/inverting face normals was in the Filters menu.

 
   
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