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Collada - Armature Export Bug
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Description

Here is the scene of rigged mesh. When trying to export and then import it in dae in blender, there is strange things with weights and especially armature that imports back very wrong.
Tried to experiment and delete mesh and export only an armature, an armature still exports/imports wrong.
Tried to delete the control bones from aramture - the same result - armature imports back wrong.
Tried with blender 2.60 r41226 and in 2.57 - same result.
Tried on two computers - same result.
Also tried to import this dae in 3ds max. Both with autodesk collada importer and open collada pugin - also very strange result, there is no mesh, only bones, but exist a bone with the same name as mesh name was.

P.S. Also tried to export in fbx the result is better, but still problem with wrong weights.

Windows XP SP3. Geforce 9600 GSO.

Details

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To Do

Event Timeline

Hi Oleg,

you said that other programs than Blender also show strange results on import of a the collada file exported by Blender. Therefore I'd guess blender exports your rigged mesh incorrectly. Have you tried to reproduce the problem with Blender 2.61?

Hi, there isn\'t enough information here to reproduce this bug.

As mentioned in the bug reporting guidelines, please include a
test file, clear step-by-step instructions on how to reproduce
this, and full system information (such as OS, graphics card,
driver versions).

this thread gives a lot of demoe files and hints about what may go wrong.

http://projects.blender.org/tracker/index.php?func=detail&aid=27598&group_id=9&atid=498

It looks pretty , much like some 90 degrees rotation made unintentionally somewhere along the export. meanwhile we have learned how to distort the rig such that it exports a correct .dae file :) BTW the example i provide in the other thread has been proved to import without issues to Maya.
maybe that helps to isolate the problem...

Hi,

I've looked at the collada code and used the file from this report to check things out... it's not really a weights problem if you haven't assigned them, the file uses bone envelopes for some of the vertices. Don't think expecting collada export to support them is reasonable.

Can't offer a view on the "not loading into 3ds Max" atm.

Collada bugs are not being handled well so far,

for this reason they are all being set as \'TODO\' and linked from our wiki page.

http://wiki.blender.org/index.php/Dev:2.5/Source/Development/Todo/Import_Export#OpenCollada

This tracker item can still be updated with useful info and closed (removed from the page above) when fixed.