Research On Boundary Enhancement Method In Volume Rendering Of 3D Shock Wave Data Field

According to research,the destructive effects of explosions are mainly caused by shock waves.Shock waves,as their main killing factor,have the effect of destroying targets at long distances.Under complex external environmental conditions,the determination of the shock wave propagation mechanism plays a very important role in evaluating the power of these weapons.With the development of high-performance computers and the continuous advancement of numerical simulation technology,experts in the field are using tens of thousands of processor cores to achieve high-confidence numerical simulation of the shock wave propagation mechanism,and carefully explore the real atmosphere and complex scenes by numerical simulation Under the conditions of shock wave propagation,diffraction and reflection laws,a large-scale three-dimensional data field containing the fine physical characteristics of the shock wave is output.How to effectively display the complex physical characteristics of shock waves in a large-scale three-dimensional data field in a visual way to facilitate the in-depth observation and analysis by experts in the field is an urgent problem that needs to be solved.For the numerical simulation of three-dimensional shock waves,this paper proposes a volume-based rendering algorithm based on feature boundary detection,which is used to extract and display the spatial structure of wavefronts from the rapidly changing three-dimensional shock wave data field.In order to detect the wavefront of the three-dimensional shock wave data field,the algorithm applies the boundary detection technology of the two-dimensional image to the three-dimensional volume data.Therefore,the characteristic data containing the wave front is extracted from the actual shock wave data field.This paper proposes two methods for determining the exact position of the wavefront,one is the filling method and the other is the neighborhood expansion method.Among them,the neighborhood expansion method can more accurately locate the shock wave front features.Then,based on the VisIt visualization platform,this paper uses the algorithm to resample the feature data and ray fusion according to the ray projection method,thereby finally achieving a clear visualization of the complex wavefront structure.The algorithm characterizes the physical characteristics of wavefronts by extracting feature data instead of transfer functions,so there is no need to spend a lot of time and effort to design transfer functions.The algorithm has been initially applied to the visualization of the three-dimensional shock wave data field,supporting domain experts to observe and analyze the evolution of shock waves.