在简化过程中，由于算法要对边进行折叠，一些三角形会发生变形，退化成点或

In the simplification process, because the algorithm needs to fold the edges, some triangles will be deformed and degenerate into points or line segments. These triangles will not be processed in the later simplification stage and model drawing stage, so a flag field is set to record the triangle patch The state of each vertex in the vertices, only when the 3 vertices are not faded, can be connected into a triangle, you can continue processing

In the simplification process, because the algorithm to fold the edges, some triangles will be deformed, degraded into points or segments, in the future simplification stage and model drawing stage will not be processed, so set a flag field to record the status of the vertexes in the triangle surface, only when the three vertex has not faded, can be connected to the triangle, can continue to process

In the process of simplification, some triangles will deform and degenerate into points or line segments due to the folding of edges. These triangles will not be processed in the subsequent simplification stage and model drawing stage. Therefore, a flag field is set to record the status of each vertex in the triangle patch, only if the value is 3 When the vertices are not faded, they can be connected as triangles and can continue processing<br>