interactionGlowRadius property
Spread radius of the directional glow. Defaults to 1.5. Radius of the interaction glow, as a fraction of the layer's shortest side.
Null — the default — asks for the iOS 26 calibration: a wide 1.6
radius under a sigma-16 Gaussian at a low alpha, the same native mode
GlassButton resolves from a null glowRadius. Pass a number to keep
the theme's glow palette instead.
Implementation
final double? interactionGlowRadius;