Abstract: High-quality rendering in molecular visualization are particularly important for researchers to observe the structure of biomolecules.The rasterization rendering effect commonly used by mainstream molecular visualization tools is not good.Advanced ray tracing rendering technology can achieve high-quality rendering effects,however,molecular rendering methods that support ray tracing in the current tools have various problems such as platform limitations,insufficient real-performance,and poor rende-ring quality.In this paper,a dynamic low-sampling ambient occlusion real-time ray tracing for molecular rendering is proposed.A simple reprojection method for ray tracing is proposed to implement temporal denoising of low-sampling ambient occlusion in dynamic.We also propose a shadow rays packet strategy to improve the parallelism of calculation when the ray traverses the scene.Experimental results show that our method can achieve interactive rendering performance on PC,and compared with the advanced VMD-OSPRay method on the TH-2 supercomputer,our method achieves performance acceleration of 1.40 to 1.64 times,and improves the serious noise problem of dynamic images.

Key words: Ambient occlusion, Data parallel, Molecular rendering, Molecular visualization, Ray tracing