Cinematic volume rendering algorithm based on multiple lights photon mapping

Cinematic volume rendering, which can obtain highly realistic rendering results, is considered to be the next-generation volume rendering technology. Cinematic volume rendering generally uses ray tracing algorithms to build a global illumination model for rendering. In the rendering process, the convergence speed of ray tracing is slow, and the physically-based global illumination model is computationally expensive. Moreover, when the rendered sampling interval is not very large, there are problems such as random noise in the rendered image. This paper proposes a Cinematic volume rendering algorithm based on photon mapping. Using the illumination model defined by the algorithm, the rendering quality can be guaranteed, and there is no random noise. The algorithm can support multi-light illumination while under the influence of multiple lights. It can effectively enhance the depth and shape of the region of interest perception. We have implemented a fast photon mapping system for medical imaging. We test the algorithm under GPU, the multi-light rendering results are realistic, and the interaction reaches the level of interactive frames.