细节增强的多功能混合体绘制光照模型

Detail enhanced versatile optical model for hybrid rendering of volume data

多功能混合体绘制光照模型是传统体绘制的扩展,它不仅可以绘制离散点的光照效果,而且也可以很好地绘制同质区域点的集合效果。但是,这种混合以后的光照模型不仅会在光照效果上有所减弱,而且需要调整的参数数量过大,必须通过手动调节多个参数才可以进行光照的增强。针对混合体绘制光照模型中光照减弱和调整参数过多问题,提出一种细节增强的多功能混合体绘制光照模型,在混合体绘制光照模型中引入曲率的概念,根据曲率与光照强度的对应关系对混合体绘制光照模型中的Phong光照模型进行改进,以提高绘制效果。通过几组体数据的实验结果表明,该方法不仅可以很好地提高多功能混合体绘制光照模型的细节表达,更好地辨别物体的形状特征,而且减少了手动调节参数的操作。

Versatile optical model can be seen as an extension to the traditional model, which can characterize both the be-havior of individual particles and the collective effect of particles in homogeneous regions. But, this hybrid model will not only be able to reduce the illumination effect, but also need to adjust a number of parameters, and it is necessaiy to manu-ally adjust the number of parameters for light enhancement. In order to solve the problem of weak light and adjustment pa-rameter ,we propose a detail enhanced versatile optical model for hybrid rendering of volume data and introduce the concept of curvature in hybrid model to enhance the render result according to the corresponding relationship between the curvature and intensity of illumination and improved Phong model. Finally, the experimental results of several groups of data show that the method can not only improve the detail expression of versatile optical model and better identify the shape of the ob-ject, but also reduce the manual operation of adjusting the parameters.