Efficient Modeling and Real-Time Rendering of Massive Urban Pipelines Based on GPU

Large amount of 2D vector pipeline data accumulates in the GIS industry,however,the traditional CPU-based LOD preprocesses of 3D modeling and rendering have deficiency in both quality and efficiency,which requires to be improved urgently.Based on the structural feature of original data,we present a novel one-time initialization method for modeling and rendering,which requires no preprocessing steps or block-by-block loading.The whole algorithm thoroughly exploits the programmable characteristics of modern GPU.The shape of the pipeline is decoded with GPU.Visibility-culling of the scene is conducted on vertex shader using two pruning strategies.Then LODs automatic geometric modeling is performed on tessellation shader.The entire process is executed without making use of the CPU.Result shows that the algorithm we proposed can be applied to massive pipeline data at the city level.Compared with traditional LOD preprocessing methods,improvements can be found in both rendering outcomes and several performance indicators.