Abstract: Achieving real 3D single model generated by oblique photography is a key technology to carry out the application of oblique photography.In this paper,a method based on the bottom texture to get real 3D single model is proposed.By acquiring the bottom information of a single object,the bottom contour texture is generated,and the bottom model is obtained,and then a RTT camera is built in the three-dimensional scene to get RTT texture of the bottom model.Finally,using projective texture mapping technology and GPU programming,the RTT texture is projected onto the 3D model of oblique photography,and the dynamic visualization of the real 3D single model is realized.Through the selection of the bottom surface model to select the real 3D single model,and then the connection of attributes and other applications based on single model are realized.Through the uniform variables provided by GPU shader language,the color modification,display and concealment of the model and operation of scene digging are realized.

Key words: oblique photography, single body model, bottom texture, rendering to texture, texture projection mapping