public Point3[] CircleCoordinates(float y)
{
Point3[] pts = new Point3[30];
Matrix3 m = new Matrix3 ();
for (int i = 0; i < pts.Length; i++) {
pts [i] = m.Cylindrical (r, i * 360 / (pts.Length - 1), y);
}
return pts;
}
public Point3 Cylindrical(float r, float theta, float y)
{
Point3 pt = new Point3 ();
float sn = (float)Math.Sin (theta * Math.PI / 180);
float cn = (float)Math.Cos (theta * Math.PI / 180);
pt.X = r * cn;
pt.Y = y;
pt.Z = -r * sn;
pt.W = 1;
return pt;
}