Fix for bug 238.  Use Real instead of float in normal calculations to solve precision issues.
Fix for bug 238.  Use Real instead of float in normal calculations to solve precision issues.

paroj/ogre,RealityFactory/ogre,OGRECave/ogre,paroj/ogre,paroj/ogre,paroj/ogre,paroj/ogre,RealityFactory/ogre,OGRECave/ogre,OGRECave/ogre,OGRECave/ogre,RealityFactory/ogre,OGRECave/ogre,RealityFactory/ogre,RealityFactory/ogre