Rendering Model Based On Physical Modeling Of Light

Rendering is an import part of computer graphics. Rendering based on physical makes model on objects and lighting models and intersection of objects in physical theory, so that the images can be high-quality. Traditional interactive rendering exchange realistic for high efficiency to meet real-time. In order to enhance the screen's effect of space three-dimensional desktop and to meet performance requirements, the research on efficient rendering model is necessary and meaningful.The paper introduces lighting models and ray tracing algorithm principle at first. In ray tracing algorithm, there are a large number of intersection operations which are import for system's efficiency, so all kinds of quadric surface's intersection operations are focused and optimized in the paper.Secondly, the strategy to accelerate ray tracing model is discussed further to improve the efficiency, the methods include grid acceleration and bounding volume hierarchies. In grid acceleration method, initially resolution of grid construction can not meet acceleration requirement after object is subdivided, in order to overcome this shortcoming, the approach in which object is taken pre-treatment before grid is divided;In bounding volume hierarchies method, the approach is used to overcome traditional hierarchical bounding box tree's disorder, in which hierarchical bounding box tree is constructed on surface area of object bounding box in space.Finally, a intersection and acceleration model in ray tracing algorithm is rendered by using the above methods, and is proved to be effective. The paper also carried out the shadow in space desktop system, so that the system is more real.