private void BuildTerrain()
{
// Figure out where the extra ring of points should go
double radius = BuildTerrainSprtRadius(_neurons.Select(o => o.Position.ToPoint2D()).ToArray());
// Figure out how many extra points to make
int numExtra = BuildTerrainSprtNumExtra(_neurons.Length);
// Lay down all the points into a single array
_terrainPoints = UtilityCore.Iterate(
_neurons.Select(o => o.Position), // first points are the neuron's locations (don't worry about Z right now, they will change each update)
Math2D.GetCircle_Cached(numExtra).Select(o => new Point3D(o.X * radius, o.Y * radius, 0)) // tack on a bunch of points around the edge
).ToArray();
// Get the delaunay of these points
TriangleIndexed[] triangles = Math2D.GetDelaunayTriangulation(_terrainPoints.Select(o => o.ToPoint2D()).ToArray(), _terrainPoints);
// Convert into linked triangles
List <TriangleIndexedLinked> trianglesLinked = triangles.Select(o => new TriangleIndexedLinked(o.Index0, o.Index1, o.Index2, o.AllPoints)).ToList();
TriangleIndexedLinked.LinkTriangles_Edges(trianglesLinked, true);
_terrainTriangles = trianglesLinked.ToArray();
}