specularAntiAliasingVariance property
Strength of geometric specular antialiasing.
A normal map or high-curvature surface carries more normal detail than a
pixel can resolve, which the specular highlight turns into shimmer as the
camera or surface moves. This estimates that sub-pixel normal variation
from screen-space derivatives and widens the effective roughness to
suppress it (Kaplanyan/Tokuyoshi). 0 disables the effect; the default
(0.15) matches the common recommendation.
Implementation
double specularAntiAliasingVariance = 0.15;