OptionaladjacentOptionalcolorInitial color mode (default single mid-gray).
OptionalghostGhost-layer opacity in [0,1] (default 0.25).
OptionallayerInitial layer index (default 0).
OptionallineExtrusion stroke width in device px (default 1).
OptionalpaddingPadding inset in device px (default 8).
OptionaltravelTravel style, or false to hide travel (default: hidden).
Preceding "ghost" layers drawn beneath the active one (default 1, floor 0).