Order-dependence taxonomy: the modes whose compositing is
NON-commutative and therefore requires back-to-front depth sorting.
normal alpha-overs a surface; volumetric (emission–absorption,
VOLUMETRIC_BLENDING_SPEC.md) attenuates what is behind each splat.
volumetric is the first SUM-projected sorted mode, deliberately
breaking the old alignment "sum ⇒ commutative ⇒ unsorted" — so this
predicate is distinct from usesPeakProjection and is the ONLY
sanctioned order-dependence test (never infer sortedness from the
projection taxonomy or vice versa).
Order-dependence taxonomy: the modes whose compositing is NON-commutative and therefore requires back-to-front depth sorting.
normalalpha-overs a surface;volumetric(emission–absorption, VOLUMETRIC_BLENDING_SPEC.md) attenuates what is behind each splat.volumetricis the first SUM-projected sorted mode, deliberately breaking the old alignment "sum ⇒ commutative ⇒ unsorted" — so this predicate is distinct from usesPeakProjection and is the ONLY sanctioned order-dependence test (never infer sortedness from the projection taxonomy or vice versa).