Hybrid-resolution shadow mapping design and hard shadows anti-aliasing in special effects movies

In order to reduce the aliasing artifact due to the finite resolution of shadow mapping in real-time rendering, we propose a hybrid-resolution shadow map based on a parallel line-sweep algorithm.First, our method generates a high-resolution depth map from light's view, and analysizes the mean difference of depth using parallel line-sweep algorithm with threads and kernels.Then this method merges the texels from bottom to top to establish indexes for the texels and discusses the storage methods.At rendering pass, our method renders shadows in real time using the hybrid-resolution shadow map for occluder detection.Experimental results indicate that our algorithm improves the resolution of boundaries' area over 20% compared with standard shadow mapping and reduces the time consumption about 9%-18% running by Dragon model.Verified by practical application, the hybrid-resolution shadow mapping is an effective real-time shadow rendering algorithm, which can effectively reduce the aliasing artifact.