Modeling And Realistic Rendering Of Special Effects For Marine Search And Rescue Simulator

Operating environment realism of Marine Search and Rescue Simulator (shorted for MSARS) mainly lies on the realistic visual system. Rendering various special effects caused by different natural phenomenon will improve system realism greatly. After analysis of current situation of MSARS visual system, modeling method and realistic rendering technology of various special effects are presented and implemented in this thesis.In order to render the change of sky scene and cloud etc. under different weather and time condition, a precomputed atmospheric scattering model which is accurate and suitable for MSARS visual system is presented. This model both takes into account Rayleigh scattering and Mie scattering. A 3D look-up texture is established to store the precomputed results based appropriate indices, which can be used to query in real-time for light rendering. Based on Perlin noise model implemented on GPU and improved Cellular Automata method, a cloud scene mixed with 2D and 3D cloud is modeled and rendered realistically. Cloud lights are rendered by precomputed scattering texture. Realistic interaction between 3D cloud and helicopter is realized. Render To Texture (RTT) technology and Dead Reckoning method are used to accelerate rendering speed of 3D cloud. Some special effects such as volumetric light, lightning, rainbow and night vision scene are rendered realistically and efficiently with different post process methods on GPU. Kelvin ship bow wave is modeled and rendered by adding disturbance sources height map. The bow wave heightmap is spliced seamlessly with current sea surface and gets a realistically rendering result. After improving the neighbor particles search method, vorticity confinement is introduced into the Smooth Particle Hydrodynamics (SPH) fluid equation to simulate rotational flow. The Navier-Stokes fluid equation is solved by CUDA efficiently. Based on this model, ship wake with partial vortex flow is implemented realistically.All these special effects rendering methods are implemented based on different modeling approach. Either the physical model or procedural model is on the premise of real-time rendering. The efficient parallel calculation and programmable property of GPU are used to acquire a higher performance of presented method. All the rendering methods presented are applied in the visual system of MSARS for testing. Captures of rendered scene and final data of performance test show that these methods, which can provide realistic rendering results and efficient rendering performance, are very suitable for visual system of MSARS.