摘要
针对现有眩光效果绘制方法的真实感和速度问题,提出一种基于GPU的真实感眩光效果绘制方法.首先根据光圈和镜头生成带有随机镜头噪声的二维衍射光栅图像;其次考虑夫琅禾费和菲涅耳2种不同的衍射效果,利用预存算法系数的快速傅里叶变换模拟衍射效果的光学过程,并通过衍射效果的光谱模型实现真实感绘制,同时利用2个独立的一维高斯卷积核加速实现bloom效果;再通过随机小角度旋转和混合操作进行真实感增强;最后采用实时光线跟踪渲染框架,在三维场景中实现了真实感眩光效果的实时绘制.该方法的主要步骤采用CUDA实现,充分利用了GPU强大的并行计算能力并兼顾考虑存储器优化策略.实验结果表明,文中方法绘制结果具有较强的真实感和实时性.
To address the problems of current realistic glare rendering approaches, this paper presents a GPU based real-time method for rendering realistic glare. Firstly, the diffraction grating with random lens noise is efficiently generated according to lens aperture. Secondly, based on diffraction principle, a fast Fourier transformation algorithm with pre-computed coefficients is employed to simulate both Fraunhofer and Fresnel diffraction, and a spectrum model is used to achieve photorealistic rendering and two independent one-dimension Gaussian kernels are introduced to achieve bloom effect. Thirdly, we apply random small rotation operations and blend operations to enhance the photorealism. Finally, the glare effect can be added into a three-dimensional scene with the new glare rendering approach integrated into a real-time ray tracing framework. Our method is implemented on CUDA architecture and efficiently utilizes the powerful GPU parallel processing capability and memory hierarchy. Experimental results show that our method can achieve real-time performance and improve realism of scenes.
出处
《计算机辅助设计与图形学学报》
EI
CSCD
北大核心
2013年第6期880-889,共10页
Journal of Computer-Aided Design & Computer Graphics
基金
国家"八六三"高技术研究发展计划(2009AA01Z303)
关键词
眩光效果
夫琅禾费衍射
菲涅耳衍射
GPU
实时绘制
glare effect
Fraunhofer diffraction
Fresnel diffraction
GPU
real-time rendering
