Research On Modeling And Methods Of Large-scale 3D Transformer Substation Scene

In the last decade,with the continuous development of smart devices as well as digital concepts,applications such as virtual reality technology,smart cities and digital factories are actively advancing the functioning of society.Among them,accurate 3D digital models provide a realistic expression of real scenes,equipment and facilities and the surrounding environment.With the development of science and technology,digital photogrammetry technology is widely used in scene reconstruction.Aerial photogrammetry images can provide rich ground elevation information as well as scene texture information to provide high-quality 3D model data for relevant buildings,but for the reconstruction of complex scenes such as chemical plants and substations,there is still no better solution due to their complex equipment instruments:1)Generation method of 3D terrain model based on contour lines.The method takes the contour data of the terrain as input,interpolates the 3D mesh surface by sampling the contour uniformly,adds the ridge regression method to the interpolation process for preliminary smoothing optimization,and finally uses the convolutional smoothing method to further smooth and optimize the terrain,which can get a smooth and realistic 3D terrain model;2)A fast slicing method for large-scale 3D scenes.This method takes a large-scale3 D scene model and a cutting plane as input.First,it performs data preprocessing on the input model to establish a concise and efficient data structure.Based on the current data structure,it quickly locates the triangle to be cut,and then according to the cut plane.The triangle patch calculates the intersection point,and finally closes it into a closed loop by the intersection point set and fills the hole to form a profile to obtain the profile cut by the current cutting plane.During the period,the GPU is used for performance optimization;3)Fast hidden line removal Method for large-scale 3D substation scene model based on Z-buffer algorithm optimization.Firstly,in order to simplify the calculation,the scene model data is integrated and reconstructed;secondly,the substation scene model is pixelized through perspective projection transformation;further,a fast model screening method is proposed based on the efficient pixelized calculation characteristics of the Z-buffer algorithm,thereby Obtain the sub-model occlusion relationship of the sub-model of the sub-model.Finally,in the experiment,the obtained occlusion relation list is combined with the existing hidden line removal algorithm,and the results show that the proposed method can significantly improve the performance of the hidden line computation;Although domestic and foreign scholar have successively explored automatic modeling methods with more realistic reconstructions,the reconstruction of large scenes has not yet reached a fully automated quality level due to the defects of raw data such as occlusion,noise and uneven density.Compared with the urban scenes containing more regularity and indoor scenes with fewer equipment categories,the complexity of the 3D structure of industrial scenes and the richness in equipment categories are more cumbersome.Therefore,our proposed method for rapid modeling of large-scale 3D substation scenes can effectively solve the practical problems in real engineering construction and provide strong technical support and contribution to the autonomy of 3D soft design parts in China.