【摘要】 随着图形硬件的飞速发展,实时光线追踪技术成为可能。借着这股潮流,涌现大量具有革新性的渲染算法,动态漫反射全局光照[1](DDGI)即是其中之一。该算法借助基于探针的辐照度插值和硬件光线追踪技术,可以实现全动态的全局光照效果。受限于有限的硬件光线追踪负荷,该算法通过帧间累积的方式混合得到每个探针的辐照度信息,由此带来问题是,当每个探针均匀发射的光线数量太少时,会存在画面闪烁等问题。因此,本文提出通过重要性采样,使得在有限光线追踪负荷的情况下,仍然能得到比较好的渲染效果。更多还原

【Abstract】 With the rapid development of graphics hardware, real-time ray tracing technology becomes possible. With this trend, a large number of innovative rendering algorithms have emerged. Dynamic Diffuse Global Illumination(DDGI) is one of them. With the help of probe based irradiance interpolation and hardware ray tracing technology, the algorithm can achieve full dynamic diffuse global illumination. Limited by the finite hardware ray tracing load, DDGI obtains the irradiance information of each probe by amortize the cost of computing multiple indirect bounces over several frames. The problem is that when the amount of ray emitted from each probe is too small, there will be flicker and other problems. Therefore, this paper proposes to use importance sampling to achieve better rendering results in the case of finite ray tracing load.更多还原