GPU Pro 6

1. Next-Generation Rendering in Thief 75

Figure 1.6. Reflection blending without sorting (left) and with sorting (right). [Image

courtesy Square Enix Ltd.]

However, this approach causes certain problems in cases when a transparent

IBR proxy is in front of the object that could be potentially reflected with SSR.

Figure 1.6 shows the issue. To address this problem, instead of simply blending

SSR and IBR, we perform layer sorting beforehand. We create a small (three to

four entries) array of reflection layers in the IBR shader and inject SSR results

into it as the first element. The array is kept sorted when we add every subsequent

IBR trace result. Thus,