public void SetPositions(Vector3[] points)
{
var ii = new List <int>();
BezierCurve.iiii(points, 0, ii);
var rd = Rander.makeRandFloat(Random.Next());
SetPositions(points, ii.ToArray(), new Color(rd(), rd(), rd(), rd()));
//var render = gameObject.AddComponent<LineRenderer>();
//render.positionCount = points.Length;
//render.SetPositions(points);
//render.startWidth = 0.5f;
//render.endWidth = 0.5f;
//render.loop = true;
}
public void SetPositions(Vector3[] points)
{
//舍弃距离太近的点
points = BezierCurve.duplicate(points);
var rd = Rander.makeRandFloat(Random.Next());
var coords = new double[points.Length * 2];
//var colors = new Color[points.Length];
for (var i = 0; i < points.Length; ++i)
{
coords[i * 2 + 0] = points[i].x;
coords[i * 2 + 1] = points[i].y;
//colors[i] = new Color(rd(), rd(), rd(), 0.382f);
}
var delauny = new Delaunator(coords);
var triangle = new List <int>();
var n = delauny.triangles.Length / 3;
for (var i = 0; i < n; ++i)
{
var tt = new List <int>();
tt.Add(delauny.triangles[i * 3 + 0]);
tt.Add(delauny.triangles[i * 3 + 1]);
tt.Add(delauny.triangles[i * 3 + 2]);
var st = tt.ToArray();
Array.Sort(st);
var a = points[st[0]];
var b = points[st[1]];
var c = points[st[2]];
var cross = Vector3.Cross(b - a, c - a);
if (cross.z > 0)
{
triangle.AddRange(tt);
}
}
var length = points.Length;
var pppp = new Vector3[length * 2];
Array.Copy(points, 0, pppp, 0, length);
Array.Copy(points, 0, pppp, length, length);
var nnnn = new Vector3[length * 2];
var tttt = new List <int>();
pp = points;
pd = new Vector3[pp.Length];
for (var idx0 = 0; idx0 < length; ++idx0)
{
var idx1 = (idx0 + 1) % length;
var idx2 = (idx0 - 1 + length) % length;
var p0 = points[idx0];
var p1 = points[idx1] - p0;
var p2 = points[idx2] - p0;
var aa = Utils.angle(p1.x, p1.y, p2.x, p2.y);
var normal = Quaternion.AngleAxis(aa / 2, Vector3.forward) * p1;
pd[idx0] = pp[idx0] + normal;
//pppp[idx0] += normal * 2f;
//pppp[idx0 + length] -= normal * 2f;
nnnn[idx0] = new Vector3(normal.x, normal.y, 0.682f);
nnnn[idx0 + length] = new Vector3(-normal.x, -normal.y, 0);
//跟我想象的逆时针顺序不一致,需要顺时针方向
//顶点数据是逆时针方向的，三角面顺序要顺时针
var tt = new int[] {
idx0, idx1, idx0 + length,
idx0 + length, idx1, idx1 + length
};
tttt.AddRange(tt);
}
triangle.AddRange(tttt);
tttt = triangle;
//DebugHelper.SaveArray($"{gameObject.name}.txt", delauny.triangles);
mesh = new Mesh();
mesh.vertices = pppp;
mesh.normals = nnnn;
mesh.triangles = tttt.ToArray();
mf.mesh = mesh;
SetColor(new Color(rd(), rd(), rd(), rd()));
//var render = gameObject.AddComponent<LineRenderer>();
//render.positionCount = points.Length;
//render.SetPositions(points);
//render.startWidth = 0.5f;
//render.endWidth = 0.5f;
//render.loop = true;
}