public static List <Edge> SortedClockwise(this List <Edge> edges)
{
var center = (edges.First().Center() + edges.Last().Center()) / 2;
var baseline = edges.First().Center();
var comparer = new CompareVectorsClockwise(center, baseline);
var sortedEdges = edges.OrderBy(edge => edge.Center(), comparer);
return(sortedEdges.ToList());
}
public static float Area(this Face face)
{
var center = Center(face);
var baseline = face.Vertices.First().Position;
var clockwiseComparer = new CompareVectorsClockwise(center, baseline);
var sortedVertices = face.Vertices.OrderBy(vertex => vertex.Position, clockwiseComparer).Reverse().ToList();
var sumOfCrossProducts = new Vector3();
for (int i = 0; i < sortedVertices.Count; i++)
{
var currentPosition = sortedVertices[i].Position;
var nextPosition = sortedVertices[(i + 1) % sortedVertices.Count].Position;
sumOfCrossProducts += Vector3.Cross(nextPosition, currentPosition);
}
var normalToFace = center.normalized;
var area = Vector3.Dot(sumOfCrossProducts, normalToFace) / 2;
return(area);
}
