Why a knob currently changes NOTHING on screen, or null when it is live — the
dependencies three's physical shader imposes between knobs, stated once so the
Layers panel can grey a slider out with the reason instead of offering a dead
control (measured on the reflections demo: at metalness = 1 the whole glass
family is inert because three scales transmission by 1 − metalness and takes a
metal's reflectance from its base colour, not its IOR).
values are the LIVE knob values (material domain, not slider space) plus the
attenuation colour, all optional so a partial record still answers.
Why a knob currently changes NOTHING on screen, or
nullwhen it is live — the dependencies three's physical shader imposes between knobs, stated once so the Layers panel can grey a slider out with the reason instead of offering a dead control (measured on the reflections demo: atmetalness = 1the whole glass family is inert because three scales transmission by1 − metalnessand takes a metal's reflectance from its base colour, not its IOR).valuesare the LIVE knob values (material domain, not slider space) plus the attenuation colour, all optional so a partial record still answers.