Bentley Descartes Ground Extraction

Hello,

I am trying to extract a surface from my 3MX model.  It seems to have trouble figuring out what is ground and what is a building.  I'm a bit confused on the Terrain Variation and the Largest Infrastructure Size options.  The YouTube video doesn't really show this. Is there an actual video that can show me how to do this (one preferably that doesn't rush thru everything without explaining) or a pdf I can read on this.  The learning center for Descartes has really nothing to do with 3MX models.  Thanks.  you can email me if necessary at adarlington@vhb.com.

Thanks

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