Model unitization

Monomer: refers to each object that we want to manage separately, which is an independent entity that can be selected; That is, when you click with the mouse, it can be displayed in different colors (called "highlight"), it can attach attributes, it can be queried and counted, and so on.

At present, there are several methods for 3D model simplification:

1. There are two kinds of logical segmentation, one is vector cutting segmentation, which uses the vector plane of a single object to physically cut the whole model to achieve segmentation. The other is vector label simplification: the vector surface data is overlaid on the corresponding real 3D model, that is, the 2D surface is selected by clicking the attributes of the vector layer to achieve the effect of selecting a single 3D model.

2. Physical cutting is single, and the main technical method to realize physical cutting is to form a single entity that can be selectively separated through three-dimensional reconstruction.

3. Label ID simplification is to give the same ID value to the vertices of the triangle contained in the target building, so as to achieve the effect of highlighting the whole model when selecting the target model alone.