Generate a toposolid element from a toposurface in your model. 
 
To generate a toposolid from a toposurface:
- Select the toposurface you wish to convert to a toposolid. 
  
 
- Click Modify|Topography tab
Surface panel
 Generate Toposolid. 
   
- In the dialog, use the pull-downs to set the base level and the family type for the generated toposolid. 
  
 
- Click Ok. 
  
 
Note: The process of generating a toposolid from an existing toposurface is non-destructive. The toposurface will remain in the model after the toposolid is generated. 
  
When using a toposurface to generate a toposolid keep the following in mind: 
- Sub-regions of the toposurface will auto-generate toposolid sub-divisions and toposolid types that inherit the original sub-region's material agt a default thickness. The generated sub-division will always be flush with the surface of the toposolid. Some sub-regions may fail if they contain many loops. For example, a striped crosswalk created as one sub-region may fail to auto-generate. 
  
 
- Site components (trees, parking elements, custom families) will need to be manually re-hosted. Railings will automatically be re-hosted to the toposolid. 
  
 
Note: For additional information on making modifications to a toposolid, see the topics in the following section: 
  
About Shape Editing