elevation

Optional per-tile elevation function. Returns the z-coordinate of the tile surface for the given TileCoordinate. When null, all tiles sit at originOffset.z. Use for terrain height maps.

Note: elevation is excluded from equals and hashCode. Two configs with the same tileSize and originOffset compare equal regardless of their elevation functions. This is intentional — lambda literals do not have stable identity across recompositions, so including them would cause spurious inequality and unnecessary gesture-hub re-registration on every recomposition.