Static shadow rendering algorithm and its implementation based on ray tracing

Shadow plays an important role in increasing authenticity and immersion degree of the scenes in virtual reality environment. It is an indispensable part of the virtual reality scene. And shadow generation also is a challenging and hot topic in the computer graphics field. With the increasing complexity of the scene, real-time shadow generation brings enormous workload to the computer. Based on ray tracing, this paper presents an algorithm to pre-compute the shadow in the scene. The algorithm maps the shadow information in the world space into a shadow texture, and blends it with the diffuse texture to reduce the computation for real-time generation of shadow. The experimental results show that the algorithm meets the rendering speed and photorealism of the scene very well and has a good implication in the 3D scene.