//-- Types assisting k-neighbor search
/// <summary>
/// Finds a certain amout of points in a list of 3D points that are the k-closest to a test point.
/// </summary>
/// <param name="pointcloud">A point cloud to be searched.</param>
/// <param name="needlePts">Points to search for.</param>
/// <param name="amount">The required amount of closest neighbors to find.</param>
/// <returns>An enumerable of arrays of indices; each array contains the indices for each of the needlePts.</returns>
/// <seealso cref="RhinoList.PointCloudKNeighbors(PointCloud, IEnumerable{Point3d}, int)"/>
public static IEnumerable <int[]> PointCloudKNeighbors(PointCloud pointcloud, IEnumerable <Point3d> needlePts, int amount)
{
var tree = RTree.CreatePointCloudTree(pointcloud);
var points = pointcloud.AsReadOnlyListOfPoints();
return(new LazyClosestPointsAmountEnumerator(tree, points, needlePts, amount));
}
/// <summary>
/// Finds the point in a list of 3D points that is closest to a test point.
/// </summary>
/// <param name="pointcloud">A point cloud to be searched.</param>
/// <param name="needlePts">Points to search for.</param>
/// <param name="limitDistance">The maximum allowed distance.</param>
/// <returns>An enumerable of arrays of indices; each array contains the indices for each of the needlePts.</returns>
public static IEnumerable <int[]> PointCloudClosestPoints(PointCloud pointcloud, IEnumerable <Point3d> needlePts, double limitDistance)
{
var tree = RTree.CreatePointCloudTree(pointcloud);
var points = pointcloud.AsReadOnlyListOfPoints();
return(new LazyClosestPointsDistanceEnumerator(tree, points, needlePts, limitDistance));
}