OgreXMLConverter has Error: Material with the name <materialName> already exists

[ryandeboer]

Ogre Version: OgreXMLConverter Tsathoggua (14.4.0)
Operating System: Windows 11
Render System: n/a

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D:\dev\git\ogre-meshviewer\newmat>D:\dev\git\ogre_build\bin\release\OgreXMLConverter.exe ninja2.mesh.xml

-- OPTIONS --
source file      = ninja2.mesh.xml
destination file = ninja2.mesh
log file         = OgreXMLConverter.log
-- END OPTIONS --

XMLMeshSerializer reading mesh data from ninja2.mesh.xml...
Reading submeshes...
Reading geometry...
Geometry done...
Reading bone assignments...
Bone assignments done.
*-*-* OGRE Shutdown
Unregistering ResourceManager for type Compositor
Unregistering ResourceManager for type Material
Unregistering ResourceManager for type GpuProgram
Unregistering ResourceManager for type Skeleton
Unregistering ResourceManager for type Mesh
Error: Material with the name Examples/Ninja already exists.

I can't convert a mesh xml that has multiple submeshes with the same material. Even the standard ninja model can convert to xml but can't be converted back because it has submeshes with the same material. If I give submeshes a different material it works. If a mesh has submeshes with the same material how do I convert an xml back to it?

[ryandeboer]

Found a workaround, commented out this code in OgreResourceManager.cpp:

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        //if (!result.second)
        //{
        //    OGRE_EXCEPT(Exception::ERR_DUPLICATE_ITEM, getResourceType()+" with the name " + res->getName() +
        //        " already exists.", "ResourceManager::add");
        //}

Now I can convert the ninja xml to mesh.

I also had this problem when trying to build debug:

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pugixml.lib(pugixml.obj) : error LNK2038: mismatch detected for '_ITERATOR_DEBUG_LEVEL': value '0' doesn't match value '2' in main.obj

I fixed it by recompiling pugixml dependency (https://pugixml.org/) in debug mode and replacing the file in the Dependencies\lib dir. Would be good if the dependencies supported both debug and release.

I'll leave this issue open, because workarounds aren't the best way of solving the problems.

[paroj]

Found a workaround, commented out this code in OgreResourceManager.cpp:

Code: Select all

        //if (!result.second)
        //{
        //    OGRE_EXCEPT(Exception::ERR_DUPLICATE_ITEM, getResourceType()+" with the name " + res->getName() +
        //        " already exists.", "ResourceManager::add");
        //}

Now I can convert the ninja xml to mesh.

this is the proper fix:
https://github.com/OGRECave/ogre/pull/3305

that bug must have been there for 6 years without anyone bumping into it..