摘要
针对图像空间绘制技术中可见性积分的计算不能达到实时,并且无法捕捉由面光源上辐射度变化引起的着色点亮度变化这两个问题,提出了一种基于自适应的空间划分技术的、在图像空间中对动态面光源效果进行绘制的方法。该方法将场景中的物体根据深度及分布情况,自适应地划分为非均匀的体素,同时构建场景中深度和法向变化量的多级纹理,并利用存储在这些体素和纹理中的信息对着色点进行快速的可见性积分和相应的光照度计算。
In the image space rendering,the visibility integration computation is unable to be performed in real time,and the illumination variance caused by the diffuse light change of area light sources is also unable to be expressed.To tackle the problems,a new image space area lighting algorithm is proposed using adaptive space voxelization.According to the depth distribution,the algorithm adaptively partitions the scene to non-uniform voxels,and constructs the depth and normal variance stored in mipmap.By using the information,the algorithm can be applied to interactively compute the visibility integration and illumination approximation for every shading point.
出处
《计算机工程与设计》
CSCD
北大核心
2012年第2期624-629,共6页
Computer Engineering and Design
基金
国家自然科学基金项目(66833007)
国家863高技术研究发展计划基金项目(2008AA01Z301)
关键词
自适应空间划分
图像空间
动态面光源
图形处理器
实时绘制
adaptive space voxelization
image space
dynamic area lighting
graphic processing unit
real-time rendering
