GPU Pro 6

200 III Lighting

Runtime

Offline

• On GPU, bake sunlight bounce irradiance

• Store irradiance at eight different hours

• Compute 2D VRAM textures (many light probes)

• De-normalize and blend irradiances

• Blend out bounced lighting with height

• Combine with indirect sky lighting and ambient occlusion

Figure 2.1. Simplified diagram of our algorithm split into two parts.

The whole algorithm is split into two parts: the static, tool-side part and the

final runtime part.

The tool-side part consists of the following steps:

1. Spawn a uniform 2.5D grid of light probes, placing them on the lowest point

accessible to the player (near the ground).

2. Split the probes