A 3D visualization method for high-curvature linear entity

The linear model is among the vital models in 3D visual scene,and its degree of fineness determines the visual effect of the scene. Common methods for constructing linear models can be divided into integral model method and spliced model method; nevertheless,for large- curvature linear models,neither method is ideal. The vertex coordinates and texture mapping are difficult to control when the integral model method is employed,and space between models and texture overlaps is inevitable when the other methods are used. A 3D visualization method for high- curvature linear entity is proposed in this paper. In the phase of geometric modeling,the vertex coordinates,normal vectors and index data are calculated for model lofting based on path and cross section. In the phase of texture mapping,textures are made by creating a mapping between vertices on the model and pixels on the photo. The results show that the algorithm can be utilized to make large- curvature linear models like railway roadbed models,and the algorithm has the merits of high accuracy,requirement of less manual work and good visual effect.