Generation of mesh, material and texture.

Thanks to the #MadMarx tutorial, BaseExample now demonstrate how to generate elements at runtime.

In the screenshot here below, the central square with the green/red gradient has been generated, not loaded from the disk.

OGRE Render Window_658

Source: http://www.ogre3d.org/tikiwiki/tiki-index.php?page=Mad+Marx+Tutorials&structure=Tutorials