Two-dimensional planar graph generation method for three-dimensional grid model

The invention is suitable for the technical field of image generation, and particularly relates to a two-dimensional planar graph generation method for a three-dimensional grid model. Compared with the prior art, the method comprises the following steps: acquiring triangular mesh data of a three-dimensional network model; performing conversion through a first preset rule according to the triangular mesh data to obtain contour edge data; establishing a corresponding bounding volume layered structure tree according to the triangular mesh data; and traversing the bounding volume layered structure tree according to the contour edge data, and performing clipping processing and overlapping expansion processing on the contour edge data to obtain a two-dimensional plane graph. On the basis of not changing triangular mesh data, the invention provides a method for generating a two-dimensional plane graph of point-line-plane feature projection of a three-dimensional model on the basis of constructing a hierarchical boun