Vectorworks is really good at creating a conceptual model, especially for urban design. Vectorworks allows you to import a plan of a city (using shape files) then quickly build the 3-D parts of the city for you to check your urban design against. You can put in a sun, create solar animations, fly around your design, and so on.
This movie shows how to link one for to another using Referencing. A design for a bus stop is added to the concept model of the urban design.
This movie shows how to quickly model a building using extrusions, Push/Pull, Add Solid, Subtract Solid and other 3D modeling tools.
This movie shows you how to place a Heliodon and Camera to create a rendered view of a conceptual model. It also shows how to edit the settings on the Heliodon and Camera.
This movie shows how to use the Modify by Record command. This command can be used to change the color of objects based on the record information attached to each object. It can even be used to extrude objects based on the records attached to the objects.
This movie shows you how to use the Polygon tool to quickly fill in the roads and sites. Then they can be extruded to create the background for a conceptual model.
Vectorworks has the ability to import shape files. These files are geo-referenced and when you import several, they line up because they know where each file belongs in the world.
Using Spaces to create an urban design. You can use spaces to create fast urban designs. They are easy to create and you can manipulate them quickly.