RadiCalc

Cascade intervals that meet the penumbra condition of Radiance Cascades (probe spacing ≤ ∆p and ∆ω ≤ minimum light size).

Initial probe spacing 1 World size ×

Minimum light size 1

Penumbra angle ° (light can't be closer than … units away from the wall)

MIPs shrinking 0× per cascade (rounded)

Cascades

adjust intervals to axis-aligned spacing of probes

adjust intervals to diagonal spacing of probes

classic hardcoded intervals

Interval scaling (doubling vs quadrupling)

Cascade intervals start where they start meeting the penumbra condition. The condition is impossible to satisfy at 0 distance.

Distances are in world units, except where marked as mips (texels of a mipmap).

Steps assume volumetric tracing (not SDF).

Rays spaced takes into account spacing of probes, and calculates for the worst case of a probe farthest away from the light.

2024.08; by kornelski.