GPU Pro 5

4. Hi-Z Screen-Space Cone-Traced Reflections 189

Roughness = 0

Roughness = 0.25

Roughness = 0.4

Figure 4.28. Another example of Hi-Z Screen-Space Cone Tracing producing spread

reflections the farther it travels due to micro fracture simulation using material rough-

ness.

levels. While the algorithm works well for local reflections, there are some edge

cases where it may fail because of insufficient information on the screen. This

algorithm can only reflect what the original input image has, as we have seen.

You will not be able to look at yourself in the mirror since that information is

not available to us in screen space. Hi-Z Screen-Space Cone Tracing is