Emulation modeling for structures and clipping method for ground surface of 3D stratum along highway based on ANSYS and OpenGL technology

Modern 3D scenery modeling and emulation technology has wide application prospects in route selection, construction and operation management of highway engineering. The study of structures emulation modeling and 3D stratum modeling which can reflect the ground surface shape changing before and after construction are important problems in the research of highway informatization. A simple method to extract the geometry information from the surface of structure 3D model with ANSYS is introduced. By combining OpenGL texture mapping technology, the structure emulation model is realized. Because the shape of ground surface will be changed a lot after construction, a clipping method named vertical projection clipping method for surface grids, which makes use of the structure surface data to clip the ground surface grids of 3D stratum model, is put forward. By applying these methods to 3D scenery emulation modeling of a certain high slope in a highway in Guangdong Province of China, it is shown that the emulation model of the slope is lively; and the ground surface shape of the 3D stratum model is very close to the real one after clipping. It proves that these methods are feasible and reasonable.