基于PDA的三维地形数据实时绘制方法研究

针对PDA硬件配置低,运算能力差等弱点,本文提出了一种基于PDA的三维地形实时绘制的优化方法。在地形数据装载到PDA之前,我们对其进行预处理:顶点坐标转换,计算法向量等并将数据根据PDA的显示特点进行分块;地形数据实时绘制过程中,我们采用假光照,背面消隐,多索引机制等方法进行优化处理。最后,在PDA上完成了实验论证工作,实验表明经过该方法处理后较明显的降低了地形绘制的响应时间,并给出了测试数据。

Study of the real-time rendering for 3D terrain dataset based on PDA

According to the weaknesses of the PDA hardware configuration and poor computing capacity,this paper proposed an optimizing method of the real-time rendering for 3D terrain dataset based on PDA.Before the terrain dataset loading to the PDA,several procedures should be done,including pre-processing,vertex coordinates conversion,vector calculation,and terrain data partition based on the features of PDA screen.During the process of real-time rendering for 3D terrain,some optimizing methods,including false light,the back face culling,multi-index mechanism and so on,were adopted.Experimental results show that the method can accelerates the terrain rendering effectively,and gives the test data.