Summary

In this chapter, we introduced the DDGI technique. We started by talking about global illumination, the lighting phenomena that is implemented by DDGI. Then, we provided an overview of the algorithm, explaining each step in more detail.

Finally, we wrote and commented on all the shaders in the implementation. DDGI already enhances the lighting of the rendered frame, but it can be improved and optimized.

One of the aspects of DDGI that makes it useful is its configurability: you can change the resolution of irradiance and visibility textures and change the number of rays, number of probes, and spacing of probes to support lower-end ray tracing-enabled GPUs.

In the next chapter we are going to add another element that will help us increase the accuracy of our lighting solution: reflections!