Want to model something based on a high resolution model or sculpt, for game for production ? well the new 3ds max 2012 has the new feature of conforming lowres meshes on pre-built highres models.
Once you are satisfied with the conform result add more polygons as you like to give a more detailed look at the models. The new 2012 max also have built-in presets for colliding objects in its stimulation, like hard objects, cloth, paper boxes… etc. enjoy this video from the GDC product demonstration.