This paper presents a method called Virtual Planar Area Lights (VPALs) to generate single-bounce diffuse-to-diffuse indirect illumination for dynamic scenes and light sources. Different from the VPLs (Virtual Point Lights) based methods, which extract point lights from RSM (Reflective Shadow Map), our method fits RSM by many planar regions which will be directly used as virtual light sources to generate the indirect illumination. In order to reduce the illumination errors introduced by plane fitting, we propose several strategies, including an illumination-guided plane fitting algorithm, a normal correction factor and a virtual light sources reuse strategy. Our experimental results indicate that our method can achieve a good balance between the rendering performance and quality. Compared with traditional light culling and clustering methods, the rendering consumption of our algorithm is reduced by at least $67\%$ with the similar RMSE (Root Mean Squared Error).

本文提出了一种称为虚拟平面区域光（VPAL）的方法，用于为动态场景和光源生成单反射漫反射到漫反射间接照明。与基于VPL（虚拟点光源）的方法不同，该方法从RSM（反射阴影贴图）中提取点光源，我们的方法通过许多平面区域拟合RSM，这些平面区域将直接用作虚拟光源以生成间接照明。为了减少平面拟合引入的照明误差，我们提出了几种策略，包括照明引导平面拟合算法，法线校正因子和虚拟光源重用策略。我们的实验结果表明，我们的方法可以在渲染性能和质量之间达到良好的平衡。与传统的光剔除和聚类方法相比，$67％$ 具有类似的RMSE（均方根误差）。