Research on CGF Entity Model Based on Factory Mechanism

The model engine development for CGF entities is designed and realized based on ldquoabstract factoryrdquo and ldquofactory methodrdquo design pattern. Firstly, the entities factory manager encapsulates the responsibility and the process of creating CGF entities, and provides an interface for creating families of related or dependent CGF entities without specifying their concrete classes; then, each created families of CGF entities is defined a corresponding parameterized factory, and it is overridden by the parameterized class identifier for each to extend or change the CGF entity product; Finally, configure and modify the created CGF entities or its components, and edit the loading information in a MTL file. The result of the engine design shows that it isolates concrete classes and makes exchanging and extending product families easy. The method also can help the client construct the CGF entity models quickly in order to reduce time and complexity.