Rendering method of real-time optical smoke screen based on physical process

Abstract

According to a real-time optical smoke screen rendering method based on the physical process provided by the embodiment of the invention, in the process of rendering smoke by utilizing an illuminationsmoke model and an infrared smoke model, a density grid, a temperature grid and a brightness grid are obtained through calculation according to the influence of factors such as background radiation,an external light source and the transmittance of the smoke on smoke rendering; meanwhile, a spontaneous radiation model is introduced into the infrared model, the transparency and brightness of smokeare calculated based on a density grid, a temperature grid and a brightness grid meter, and mixed rendering is conducted on pixels in the sight line direction of the current position of a previous time frame based on the brightness and transparency of rays; and the visual authenticity and the illumination accuracy of smoke rendering are improved while the efficiency is considered.

Description

technical field [0001] The invention belongs to the field of optical smoke screens, and in particular relates to a physical process-based rendering method for real-time optical smoke screens. Background technique [0002] Smoke simulation is a subproblem of incompressible low-velocity flow in computational fluid dynamics. This kind of low-velocity fluid exists widely in the real natural environment. In order to improve the rendering realism of the scene, how to efficiently and realistically render this kind of low-velocity fluid has become an unavoidable hot issue in computer graphics. The most common low-velocity fluids in life are smoke and flowing water, both of which are solutions to the incompressible NS equations. The main difference is that the water body has an additional boundary condition of the liquid surface, which causes the smoke to pay more attention to the overall shape, while the flowing water is more Pay attention to the change of the surface, which leads ...

AI Technical Summary

Problems solved by technology

Later, the researchers applied the fluid dynamics model to the real-time simulation of infrared smoke screens. The fluid dynamics model adopted the Stable Fluid model, and CUDA was used as a development tool to accelerate the fluid simulation, which met the real-time requirements. However, the infrared illumination model was relatively simple. The rendering effect is poor, there is a big gap with the real smoke, and the simulation result is not realistic enough

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