intensity property
Nonnegative scalar on the occlusion strength. 1.0 is each method's
calibrated look (AmbientOcclusionMethod.groundTruth matches ray-traced
visibility there; AmbientOcclusionMethod.obscurance is normalized to
its tuned strength), so the same value reads consistently across both
methods. 0.0 removes screen-space occlusion. Output obscurance
saturates at 0.98 before power is applied.
Implementation
double intensity = 1.0;