drawsNothing property
Whether this material currently draws nothing at all, keeping its render items out of every pass (color, depth prepass, shadows).
Refreshed per frame by the scene pre-pass, so a material can toggle it
live. The base material always draws; the shadow catcher returns true at
shadowIntensity == 0 as a true early-out.
Implementation
@override
bool get drawsNothing => _shadowIntensity == 0;