I have used Paradigm MultiGen Creator for building visual databases for realtime systems and I am currently using it to build excercise areas for a Polaris ship bridge simulator. I am not sure if it is the fix to your troubles (i know for certain that it is definetly not cheap...)
However it is a modeller that definetly focuses on realtime rather than fancy rendering effects.
Check out www.multigen-paradigm.com
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I have used Paradigm MultiGen Creator for building visual databases for realtime systems and I am currently using it to build excercise areas for a Polaris ship bridge simulator. I am not sure if it is the fix to your troubles (i know for certain that it is definetly not cheap...) However it is a modeller that definetly focuses on realtime rather than fancy rendering effects. Check out www.multigen-paradigm.com