Implementing ray-traced reflections

In this section, we are going to leverage the hardware ray tracing capabilities to implement reflections. Before diving into the code, here’s an overview of the algorithm:

1. We start with the G-buffer data. We check whether the roughness for a given fragment is below a certain threshold. If it is, we move to the next step. Otherwise, we don’t process this fragment any further.
2. To make this technique viable in real time, we cast only one reflection ray per fragment. We will demonstrate two ways to pick the reflection’s ray direction: one that simulates a mirror-like surface and another that samples the GGX distribution for a given fragment.
3. If the reflection ray hits some geometry, we need to compute its surface color. We shoot another ray toward a light that has been selected through importance sampling. If the selected light is visible, we compute the color for the surface using our standard lighting model.
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