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Exporting Your Uv Mapped Model To .3ds How to avoid broken vertices

#1 User is offline   key0p 

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Posted 18 March 2005 - 09:21 AM

When you export a mesh to .3ds format with "Preserve MAX's Texture Coordinates" enabled, it creates errors in 2 ways.

First up, the UV stitching get corrpted.While the UV co-ordinates themselves remain in place, some of their welds get broken.You can see in the following image, the UV edges(green lines) before export, and after export.




WHile the co-ordinates themselves remain intact, unstitched vertices are slower to render.It also complicates the second problem, which is that the mesh becomes broken along the UV edges.You can see in the following image that the top of the mesh is one single element, however after export it has been broken into multiple elements.




To avoid this, you need to save the UV layout, and export the model with "Preserve MAX's Texture Coordinates" disabled.




To save the UV layout, first apply an Unwrap UVW modifier to the mesh, then in the Parameters rollout, click 'Save'



Upon importing your model, apply the Unwrap UVW modfier again, and load the UV file you saved.

If you follow this procedure, you will not encounter mesh division due to UV mapping, and your UV seams will also remain intact.

This post has been edited by key0p: 18 March 2005 - 09:22 AM

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#2 User is offline   Topknot 

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Posted 18 March 2005 - 10:04 AM

Ohh I smell a *Sticky*...Spot on KeyOp.... biggrin.gif
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#3 User is offline   Chronomaw 

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Posted 18 March 2005 - 11:09 AM

Nice work, key0p. This should be usefull. smile.gif
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#4 User is offline   key0p 

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Posted 18 March 2005 - 12:05 PM

No worries, thanks to flyby pointing out that UV mapping causes mesh breaks smile.gif
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#5 User is offline   HKH 

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Posted 26 March 2005 - 01:19 AM

I never new any of this very good info.
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#6 User is offline   spyvspy 

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Posted 05 April 2005 - 07:05 PM

I tried applying a saved UVmap from max6 to a 3ds mesh exported without the unwrap into Gmax. The unwrap was very distorted and unusable. What would cause this?

here is what i saw:




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#7 User is offline   key0p 

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Posted 06 April 2005 - 02:28 AM

could you please attach the files so I can take a look at them, I havent seen it happen before.
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#8 User is offline   Opals25 

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Posted 06 April 2005 - 05:16 AM

On a simmilar not, I just noticed this. sad.gif
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#9 User is offline   spyvspy 

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Posted 06 April 2005 - 07:13 AM

QUOTE(key0p @ Apr 5 2005, 4:28 PM)
could you please attach the files so I can take a look at them, I havent seen it happen before.

file is here
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#10 User is offline   key0p 

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Posted 06 April 2005 - 01:15 PM

the problem is that you are exporting the UVs and geometry from an editable poly. Collapse to an editable mesh, and try again.
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#11 User is offline   spyvspy 

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Posted 06 April 2005 - 06:30 PM

Did it like you say and works perfectly. Thanks.
I still don't know all the effects of mesh/poly conversion.
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#12 User is offline   key0p 

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Posted 06 April 2005 - 06:40 PM

neither do I smile.gif
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