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model exported from 3D reviewer to pdf have their "normals" flipped. Please help

Forum Index > 3D > model exported from 3D reviewer to pdf have their "normals" flipped. Please help
2011-03-23 12:12:36
sanjigento
sanjigento's picture
Registered: Mar 22 2011
Posts: 7

Hi,
 
I opened a .u3d model in 3D Reviewer and it looks fine. Once I export the model to PDF, the models normals get flipped, the surfaces that should be visible are transparent.
I tried directly importing to Acrobat with the same results.
 
Is there any settings in 3D Reviewer/Acrobat that may correct this?
 
Thanks

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2011-03-23 13:23:07
#1
UVSAR
UVSAR's picture
Expert
Registered: Oct 29 2008
Posts: 1357
It's a common effect if a model was either built that way by mistake (we see it for example with elements that are "mirrored" in a program such as 3DS Max, then exported to 3DS or OBJ without resetting the local axes), or the mesh was compressed too hard when converting to U3D. Some software displays 2-sided faces so you can't easily tell if the normals are flipped, but Acrobat will only render single-sided even if a material is flagged as 2-sided.

3D Reviewer doesn't have the option to perform poly-level editing of files, so you'll need to unify the normals via another program.
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2011-03-23 21:48:37
#2
sanjigento
sanjigento's picture
Registered: Mar 22 2011
Posts: 7
Yes I used mirroring and 2 sided materials, Ill go back and correct these.
Thanks again for resolving my problem!
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