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Hierarchical concept

Figure 5-3 shows an image model of a group of objects given a hierarchical structure. object1 is set to the shallowest level in the hierarchy, and object2 and object3 are defined as the following levels.

Figure 5-3 Hierarchical image model

When using a hierarchical structure, the object behaves as shown in Figure 5-3. Figures 5-4 and 5-5 show the results of applying the same transformation to an object group that does not use a hierarchical structure and an object group that uses a hierarchical structure (each object is parallel to the X direction). To move).

Figure 5-4 Example of moving an object without using a hierarchical structure

Figure 5-5 Example of object conversion using hierarchical structure

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