Three-dimensional model generation method and three-dimensional virtual maintenance system for thermal power plant unit

The invention provides a three-dimensional model generation method and a three-dimensional virtual maintenance system for a thermal power plant unit. The three-dimensional model generation method comprises the following steps: generating point cloud data of the thermal power plant unit by adopting a three-dimensional laser scanner; generating a three-dimensional model of the thermal power plant unit by adopting a reverse engineering technology according to the point cloud data; obtaining a picture of the thermal power plant unit; sticking a film on the three-dimensional structure model according to the photo to generate a three-dimensional model after film sticking; rendering the film-pasted three-dimensional model by adopting a multi-detail-level technology and a dynamic occlusion elimination technology to generate a rendered three-dimensional model; and displaying the rendered three-dimensional model by adopting an image quality adaptive technology. According to the method, the three-dimensional model is ge