Make Terrain Tool
The Make Terrain Tool allows you to designate a selected geometry as a Terrain, by automatically putting it on the vwPlugin_Terrain Layer. The Tool is accessed via the main menu from the Plugins → Virtualwind → Utility tools → Make into Terrain sub-menu item, or through the "Utilities" portion on the Virtualwind Plugin toolbar.
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The Make Terrain Tool operates over a selection: if nothing is select when you hit the "Make Terrain Tool", the Tool will throw an error. By placing geometry on the Terrain Layer, you indicate to the Export to VWS (all) Tool that the geometry should be exported as a Terrain.
Rules
There are a couple of rules to using the Make Terrain Tool:
The selection must be a single Group: The selection cannot be anything other than a Group, or else the Tool will throw an error. Similarly, it is also an error if the selection contains more than one Group.
The selected Group must be top-level: If the selected Group is a child of a highest-level Group, the Tool will throw an error.
There can only be one Group on the Terrain Layer at a time: If there is an other Terrain on the Layer vwPlugin_Terrain, the Tool will demote that Group to Layer0, after asking your permission to do so. (If you answer "No", the Tool will not do anything.) Note that the Tool throws this warning message if it detects that the vwPlugin_Terrain is present, even if there is no geometry on that Layer. It is just a precaution.
These rules are only enforced when you use the Make Terrain Tool. Technically, there is nothing stopping you from manually assign some extra geometry to the vwPlugin_Terrain Layer. If you do this, however, it is likely that an VWS file resulting from an Export will have multiple terrains, which is opposed to our intuition that there is only one terrain.