photon mapping的vc++程序实现，使用opengl api，模拟了光子跟踪的绘制算法-photon mapping of vc++ program implementation, the use opengl api, to simulate the photon mapping algorithm for tracking

渐进式光子映射的代码。取自OptiX光线追踪引擎。-Progressive photon mapping code. From the OptiX ray tracing engine.