internal RoadCollection(RoadTopology topology, AssetLoadContext loadContext, HeightMap heightMap)
: this()
{
// The map stores road segments with no connectivity:
// - a segment is from point A to point B
// - with a road type name
// - and start and end curve types (angled, tight curve, broad curve).
// The goal is to create road networks of connected road segments,
// where a network has only a single road type.
// A road network is composed of 2 or more nodes.
// A network is a (potentially) cyclic graph.
// A road node has > 1 and <= 4 edges connected to it.
// A node can be part of multiple networks.
// An edge can only exist in one network.
// TODO: If a node stored in the map has > 4 edges, the extra edges
// are put into a separate network.
var networks = RoadNetwork.BuildNetworks(topology);
foreach (var network in networks)
{
_roads.Add(AddDisposable(new Road(
loadContext,
heightMap,
network)));
}
}