一种基于哈尔小波的软阴影渲染算法在GPU上的实现

由于小波相比球面谐波函数能够更好地表现许多高频光照细节,哈尔小波被越来越多地被应用在许多基于PRT的全局光照渲染算法中.在PRT框架下,利用小波变换对光照、遮挡、BRDF等函数进行预处理.然后,利用所得到的预处理数据,在GPU上来实时地渲染软阴影.在渲染过程中,使用Tree-structured算法来计算渲染方程.为了能在GPU上实现该算法,对该算法中所用到数据结构的实现方式进行重新设计,并对该算法的实现过程进行调整和优化.同时,利用GPU的一些特性,在一些实现细节上也进行了相应优化.

IMPLEMENTING HAAR WAVELET BASED SOFT SHADOW RENDERING ALGORITHM ON GPU

Superior at approximating high-frequency lighting than spherical harmonics function,wavelets have been increasingly adopted in PRT-based global light rendering algorithm.Lighting,occlusion and BRDF functions are pre-processed on Haar wavelet basis in PRT framework.Soft shadows are then rendered on GPU at runtime using the pre-processed coefficients.The tree-structured algorithm is used to evaluate the Rendering Equation during the rendering process.Lots of modification has been done on the implementing mode...