Digital twinning-oriented scene lightweight method

The invention relates to a digital twinning-oriented scene lightweight method, which comprises the steps of 1, inputting model data, calculating a quadratic error metric matrix considering constraints, calculating an optimal folding point and a corresponding folding cost, gradually taking out an edge with the minimum folding cost for folding, and generating a simplified three-dimensional network model; 2, calculating the surface discrete curvature of the vertex of the three-dimensional network model, finding out a point of which the curvature value is less than that of all adjacent points in a multi-direction gradient descent mode to serve as a local minimum value point, on the basis of the vertex with the minimum local curvature, carrying out region marking, flat region marking and region segmentation marking on neighborhood vertexes, and combining over-segmented regions by using region clustering; and 3, calculating Euclidean geometric distances among the planes after segmentation and combination, and gener