private void SetCorners()
{
Xyf xyf = Xyf.Create(tileX, tileY, face);
double dc = 0.5 / nside;
double xc = (xyf.ix + 0.5) / nside;
double yc = (xyf.iy + 0.5) / nside;
TopLeft = Fxyf.Create(xc + dc, yc + dc, xyf.face).toVec3();
BottomLeft = Fxyf.Create(xc - dc, yc + dc, xyf.face).toVec3();
BottomRight = Fxyf.Create(xc - dc, yc - dc, xyf.face).toVec3();
TopRight = Fxyf.Create(xc + dc, yc - dc, xyf.face).toVec3();
}
private Vector3d[] Boundaries(int x, int y, int step)
{
int nside = step * Math.Pow(2, Level);
Vector3d[] points = new Vector3d[4];
Xyf xyf = Xyf.Create(x + faceX * step, y + faceY * step, face);
double dc = 0.5 / nside;
double xc = (xyf.ix + 0.5) / nside;
double yc = (xyf.iy + 0.5) / nside;
points[0] = Fxyf.Create(xc + dc, yc + dc, xyf.face).toVec3();
points[1] = Fxyf.Create(xc - dc, yc + dc, xyf.face).toVec3();
points[2] = Fxyf.Create(xc - dc, yc - dc, xyf.face).toVec3();
points[3] = Fxyf.Create(xc + dc, yc - dc, xyf.face).toVec3();
return(points);
}