Realistic Modeling And Rendering Of Debris Flow

Debris flow is a kind of geological action between water flow and landslide. It frequently occurs in mountain areas after heavy rain (other causes may be earthquake, the eruption of volcano, the melting ice and snow, etc). It can break out with litter warning and rush down with fast speed, so that the capturing of debris flow is very difficult. The realistic simulation can vividly show the dynamic process of debris flow and is helpful for the local people to survive. It can also be applied in the areas such as disaster rescue for governments, special effects in movies, digital entertainment, and popular science education, etc.This paper is organized as follows.Chapter 1 introduces the tragic hazards caused by debris flow, reviews previous related work in the area of geology and computer graphics, and briefly describes the main research work of this paper.Chapter 2 introduces the theory basis of physics-based fluid simulation, especially the SPH (Smoothed Particle Hydrodynamics) method. This chapter is the base of the following simulation of debris flow.Chapter 3 proposes a new unified particle-based solid-liquid two-phase flow model according to the motion characteristics of debris flow. We first use the SPH method to simulate the movement of liquid phase, adopt the rigid body model (just exists translation and rotation) to restrict the movement of solid phase, then achieve the interaction between the above two phases based on particles. In addition, we use the GPGPU technologies to speed up the computing.Chapter 4 discusses the rendering results of debris flow. For the liquid phase, we improve the original implicit surface function, which speeds up the reconstruction of surface. And for the solid phase, we model the stones carefully. Then we consider and simulate the interactions between debris flow and other scene objects, especially the effect of debris flow destroying and submerging buildings. Additionally, we implement the animation and rendering of flood and landslide based on the same model.The summary and conclusion of this paper are given in Chapter 5, as well as the discussion of the further research work.