pCadColl->ConvertUnits

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double tessellationTolerance = pCadColl->GetTessellationTolerance();
      // convert tolerance from CAD to SolidWorks API units (meters)
      CPCDbc_coll::UNITS collUnits = pCadColl->GetUnits();
      pCadColl->ConvertUnits (&tessellationTolerance, collUnits, CPCDbc_coll::M);