/// <summary>
/// Get the biome to use for the given chunk
/// </summary>
/// <param name="chunkID"></param>
/// <returns></returns>
public Biome getBiomeForChunk(Coordinate chunkID)
{
/// get the closest centers by distance that may be intersecting this chunk
List <Vertex> closestBiomeCenters = biomeVoronoiCenters.Keys
.OrderBy(vertex => ((Coordinate)vertex).distance(chunkID.xz))
.Take(MaxBiomesPerSlicedChunk).ToList();
// get the bounds of this chunk from above as a rectangle
Coordinate chunkMin = chunkID * Chunk.Diameter;
Coordinate chunkMax = chunkMin + Chunk.Diameter;
var chunkBounds = (chunkMax, chunkMin);
/// find all intersecting cells by their edges
List <Vertex> intersectingVoronoiCellCenters = new List <Vertex>();
foreach (Vertex vornoiCenter in closestBiomeCenters)
{
vornoiCenter.centerPointOf.forEachEdgeUntil((edge) => {
if (Delaunay.LineIntersectsRectangle(chunkBounds, (edge.start, edge.end)))
{
intersectingVoronoiCellCenters.Add(vornoiCenter);
return(false);
}
return(true);
});
}
// if there are no intersecting cells, we're in the cell
if (intersectingVoronoiCellCenters.Count == 0)
{
return(biomeVoronoiCenters[closestBiomeCenters[0]]);
}
else if (intersectingVoronoiCellCenters.Count == 1)
{
World.Debug.logAndThrowError <System.MissingMemberException>(
$"Only one cell found to intersect this chunk, that shouldn't happen as all half edges are two sided"
);
return(default);
