TrackSurfaceOptions

What buildTrackSurface builds from.

Properties

Property	Type	Default value	Description
lift?	(across, along, point) => number	undefined	Metres to raise the surface at a point, straight up: snow, drifts, a hillside. It is handed the point’s track coordinates and the world point before the raise, which it must not change. A side cut short by another leg ends at that leg’s height instead.
paint?	(across, along) => ArrayLike<number>	undefined	The vertex colour at a point, as linear red, green and blue from 0 to 1. Left out, the surface has no vertex colours.
section	TrackSectionPoint[]	undefined	The cross-section, left to right.
spacing?	number	0.5	Metres between the cross-sections laid along the track.
terrain?	TrackTerrain	undefined	Land round the surface out to the horizon: sunk under it, leaving its outline at the outline’s height, then climbing into mountains. It draws as the last zone, "terrain", with smooth normals, uvs of world x and z over tile, and white vertex colours when painted. Left out, the surface ends at its rims.
tile?	number	1	Metres of surface one repeat of a texture covers: the uvs are metres across and along over this.
track	Track	undefined	The track the section runs along.
zones?	string[]	[], one group	The zones, in the order of the geometry’s material groups. A strip goes to the zone its track points weigh more than half, and to the first zone when none does.