This guide gives a hands-on description of the basic CityEngine modeling workflow. This page describes similar steps as when using the City Wizard. But in contrast, here the different steps are invoked manually.
Creating a new CityEngine Scene
After at least one CityEngine project has been created, the first step is to create a new scene. This can be done in the main menu via. The name of the CityEngine scene can now be entered and after pressing Finish, the new project is created.
Creating a City Layout
Starting with CityEngine 2010, street and lot shapes are created dynamically from given graph network structures. Therefore, the extra steps of creating and subdividing shapes are no longer necessary.
The easiest way to create a city layout consisting of streets, blocks and lots is to invoke the Street Growth Wizard from the main menuIn this wizard, several growth parameters such as the intended number of streets or the street pattern can be selected. When completing the wizard, CityEngine creates a new Street Network layer (or extends an existing street layer, if selected) containing the graph network, blocks, and street and lot shapes. Later, the resulting shapes can be used as a starting point for the grammar-based modeling.
Street networks can also be edited manually by using the graph edit or transform tools in the main toolbar. Selected streets are deleted via the DELETE key. By using the inspector window, attributes such as the width of the selected streets can be edited.
In addition, street networks can be designed in an external application such as Autodesk's AutoCAD and then imported into the CityEngine. This can be done by invoking the import wizard in the File menu, e.g.for .dxf files. Alternatively, CityEngine also supports data exported from OpenStreetMap.
Similarly, arbitrary polygon meshes can be designed in an external application such as Autodesk's Maya or ESRI's ArcGIS and then imported into the CityEngine. This can be done by invoking the import wizard in the File menu, e.g.for .obj files or (Shapefile Import for ESRI Shapefiles accordingly). The imported shapes can be used in the same way as shapes generated by the CityEngine: You can edit them and you can assign CGA rule files in order to generate building models.
Using the City Wizard
The City Wizard is the easiest way to generate your first city within seconds. It integrates above steps - creating street networks, street and lot shapes - in a single user interface step and uses pre-defined parameter sets for the algorithms. It also assigns selected rule files to the created shapes. The created city is stored in a CityEngine scene file, and can be explored, modified and further extended.
The City Wizard is invoked from an existing workspace any time by selecting. Then select City Wizard, hit next and follow the self-explaining wizard pages.
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