public override List<Atom> Produce(CityGenerator generator)
{
List<Atom> production = new List<Atom>();
// Create a new map node
Rule rule = generator.RuleAtCoordinates(Node.position);
MapNode spawn = new MapNode(Node.position + forward * rule.CalculateRoadLength(this, generator));
spawn.ruleType = ruleType;
// Fetch the spawned node's neighbours
List<MapNode> neighbours = generator.GetNeighbours(spawn, generator.neighboursSearchRadius);
// Check if the node is close to one of its neighbours so that they can be merged into one node
bool merged = false;
Vector2 spawnPosition = spawn.PositionAsVector2;
foreach (MapNode neighbour in neighbours) {
// Convert coords to 2D, we don't want elevation messing around with our merging algorithm
Vector2 neighbourPosition = neighbour.PositionAsVector2;
// Check for proximity
if (Vector2.Distance(spawnPosition, neighbourPosition) <= generator.nodeMergingMaximumDistance) {
// The neighbour merges
spawn = neighbour;
// Stop iterating
merged = true;
break;
}
}
// Create a map edge between the current map node and the spawn
MapEdge spawnedEdge = new MapEdge(Node, spawn);
if (!merged) {
// Perform the intersection of the spawned node's edge against the neighbours' edges
bool intersected = Intersect(spawn, spawnedEdge, neighbours);
// Raycast to check for water
RaycastHit hit;
if (Physics.Raycast(spawn.position + Vector3.up * 1000f, Vector3.down, out hit)) {
if (hit.collider.gameObject.tag == "Water") {
// Spawned over water, remove the edge from the starting node
Node.edges.Remove(spawnedEdge);
// Skip this node
return production;
}
// Set the Y coordinate of the spawned node to match the height where the raycast hit
spawn.position.y = hit.point.y + 0.1f;
}
// Add the newly created map node to the environment
generator.AddMapNode(spawn);
// Continue producing only if there were no intersections
if (!intersected) {
// Summon a branch atom
Atom branch = new BranchAtom(this);
branch.Node = spawn;
// Add the branch atom to the list of results and we're done
production.Add(branch);
}
}
return production;
}