基于改进Blinn-Phong光照模型的机载SVS地形着色方法

A Terrain Shading Method of Airborne SVS Based on Improved Blinn-Phong Illumination Model

三维地形着色技术是机载合成视景系统的重要技术之一,传统的纹理贴图需要大量纹理数据库存储资源,基于光线追踪的全局光照模型对嵌入式软硬件资源要求高。针对这一问题,设计了一种基于改进Blinn-Phong光照模型的机载合成视景系统(SVS)地形着色方法,改进了光照模型,优化了顶点颜色映射、法向量计算算法。仿真试验结果表明,改进方法存储占用、内存占用显著低于纹理贴图,在CPU占用率、GPU占用率、显示帧率方面优于改进前,适用于机载合成视景系统应用场景。

3D terrain shading technology is one of the important technologies of airborne Synthetic Vision System(SVS)traditional texture mapping requires a large number of texture database storage resources and the ray-tracing based global illumination model has high requirements for embedded software and hardware resources.To solve this problem an airborne SVS terrain shading method based on the improved Blinn-Phong illumination model is designed the illumination model is improved and the vertex color mapping and normal vector calculation algorithms are optimized.The simulation test results show that the improved method has significantly lower storage and memory usage than texture mapping and the improved method is better than the method before the improvement in terms of CPU usage GPU usage and display frame rate and is suitable for the application scenarios of airborne SVS.