Research On The Methods Of Rigid Body Fracturing Simulation Effects

In the 21st century, the rapid development of virtual reality technology has covered film, game, engineering simulation, military simulation and other fields. In order to simulate all kinds of complex physical phenomena in real world, the computer graphics has been a hot topic in the field of computer. While the realism and immersion of rigid body fracturing effects also play an important role in the application of virtual reality technology.This paper’s goal is research the real-time fracturing. Against the rigid body model, we have comprehensively analyzed the effects and problems of existing methods. Because of the physical-based modeling has some disadvantages such as uncontrollable result, lack of real time and can’t be applied into the game industries. We have done a list of works and obtained following results by geometric-based modeling.(1) We have analyzed two classic fracturing methods that physical-based modeling and geometric-based modeling, summarized their advantages, disadvantages, application fields, implementation processes, key technologies and ultimate effects.(2) Apply the Voronoi algorithm to the rigid body fracturing simulation. At the two-dimensional plane, we generate the 2D Voronoi diagram within the boundaries by 2D Voronoi partition algorithm. The process includes inserting the seed points, iteratively grouping the seed points, generating Voronoi diagram and merging Voronoi diagram. At the three-dimensional space, we cut the model into 3D Voronoi fragments by 3D Voronoi Flip-Based incremental algorithm.(3) According to use the API provided by Havok, we design a basic framework based on geometric-based modeling. In this paper, we take the geological model as an example and introduce the implementation process of fracturing simulation. The framework has two stages:model preprocessing and physical simulation. During the model preprocessing stage, the model will be divided into many fragments, after that we should establish the breakable linear constraints between the fragments. During the physical simulation stage, when the external force acts on the model face, according to execute the collision detection and collision response, we should calculate if the constraints reach the threshold to determine if the model will be fractured. This method improve the realism on the foundation of real time.(4) According to analysis the fracturing effects of geological model, plaster model and multiple models scene, we have verified the algorithm’s realism and real time. Fragments of model is realistic, dynamics property of rigid body is perfect. The experimental results show that the algorithm has good versatility and can be applied to rocks, walls, plaster and other materials.