EVSM2 (positive-only) shadow test. m0/m1 must have been baked as
(E[w], E[w²]) with w = evsmWarp(d, c) for the SAME c. minVariance is in
linear-depth units and scaled into warp space via the warp derivative
d/dd exp(c·d) = c·w so the floor behaves consistently across the range.
EVSM2 (positive-only) shadow test.
m0/m1must have been baked as (E[w], E[w²]) withw = evsmWarp(d, c)for the SAMEc.minVarianceis in linear-depth units and scaled into warp space via the warp derivative d/dd exp(c·d) = c·w so the floor behaves consistently across the range.