The Method to Add Sky Background in 3D Virtual Engine

In GTENG engine, scene manager is used to establish the corresponding mesh nodes of skybox or sky hemisphere, and sky texture files are set up in the order of the built-in texture name. These sky texture files are placed in the directory that can be searched by state manager, and they can be called when using to generate sky background. This paper gives the general process of creating skybox and sky hemisphere. By classifying and defining the outer, inner and cloud layer of skybox, the composition of their texture files is explained. Further, the general procedure of making skybox texture by using Terragen software is discussed. The methods of making outer and inner sky texture are illustrated, including setting and adjusting atmosphere, light, water, camera, coordinate, rendering and texture block. The application shows that it is a very effective and connvenient method to add sky background in GTENG engine cooperating with Terragen software to create skybox texture, and the effect of sky background in the application of 3D visual simulation is realistic.