基于改进简化天空光照模型的天空绘制算法-《计算机技术与发展》

文章信息/Info

Title:: Skylight Draw Algorithm Based on a Simplified Skylight Rendering Model of Modification

Author(s):: ZHANG Li-min; YAN Wen-jun; Electronics and Info.Eng.Department,Naval Aeronautical Engineering Institute

摘要:: 通过使用Hoffman等的算法进行天空效果的绘制,会产生两个问题：在绘制的天空效果图的中央产生一条肉眼可视的黑带;散射系数不能随着观察者视点位置和太阳的位置变化而变化。通过改变Rayleigh散射方程中与散射方向有关因子的系数,解决使用Hoffman等的算法在绘制天空效果时产生黑带的问题;通过建立Mie散射方程方向系数与观察者视点位置和太阳位置之间的线性方程,解决散射系数不能随视点位置和太阳位置变化的问题。结果表明,改进后绘制的天空效果将更适用于飞行模拟器实时仿真

Abstract:: The direct use of the algorithm of Hoffman to rendering the sky effect can result in two problems：in the middle of the sky will produce a dark band and scattering coefficient can＇t change with the observers＇ view position and the position of the sun.It altered the directional part of Rayleigh scattering equation to solve the problem of dark band in the algorithm of Hoffman.Through establishing a linear equation based on both observer altitude and sun position to solve the problem of that the scattering coefficient can＇t change with the view position and the sun position.The results show that the modified effects will be drawn sky is more flight simulator real-time simulation