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You need to know how to 3D model if you want to make items. I would recommend using a program called Blender, it's free You can download it at www.blender.orgBefore going straight into item making, I would recommend getting familiar with the program. There are plenty of tutorials available on the internet. 3D modeling is not easy and takes some time to get used to.Once you're confident with 3D modeling, if you want, I can give you some links and pointers on the process of item making. There is a tutorial for making items for Impressive Title models here. You may find this helpful also but it uses an older version of Blender (2.49b). Good luck!
For items I tend to use Blender 2.49b as it has an ogre importing/exporting addon already installed. This is the one I use: http://www.mediafire.com/download/jk7dnpj65khlj43/Blender+Foundation.zipTo allow Blender to export/import .mesh files you'll need to install Python version 2.6.6 (hopefully it should be included with the link above)You'll need to Ogre CommandLineTools which convert .xml to .mesh visa versa. You can find the link here: http://sourceforge.net/projects/ogre/files/ogre-tools/1.6.0/OgreCommandLineTools_1.6.0.msi/downloadTo start importing, copy and paste one of the Feralheart models (Feralheart >> Media >> Models) such as cbody1.mesh and paste it in the same folder as the CommandLineTools. From there drag the file into the OgreXmlConverter file and you should have an .xml file. Open Blender and go File > Import and find the .xml file and hopefully the canine model should appear without any trouble. From there I would recommend the tutorial found on KITO... there's actually two but one is unfinished. You only need to follow up to texturing before exporting, no need to worry about item rigging, that's all Impressive Title stuff ^^http://www.kitopen.com/t199-the-original-how-to-make-items-in-blenderhttp://www.kitopen.com/t2127-sombra-s-re-made-item-mesher-tutorial-currently-no-rigging-tutorialHope that all makes sense