1. Modeling methods.
There are three ways to create 3D models [6]: Property stretching, establishing
with 3D symbols, and importing MultiPatch type data. The method of property
stretching is rarely used in ArcGIS. Besides, though such method as establishing
with 3D symbols and importing MultiPatch type data all can create 3D models, but
the shape of the 3D models generated by the same universal symbol are identical.
So the second method could not simulate the real situation. While 3D models
generated by the type of the MultiPatch collections are different, possessing their
own attribute information and being independent of each other. Therefore, in most
cases, we use the method of importing MultiPatch type data to create 3D models.
This paper mainly explores the method of importing MultiPatch type data to create
3D model as well.