public static void GetCirclePointsOnXZPlane(Vec3 height, double radius, int pointCount, ref Vec3[] positions, int writeBegin)
{
var stepAround = new Angle(new Degree(180)) / (pointCount / 2.0);
var step = new PolarCoordinate(radius, new Angle(new Degree(-90)), Angle.Zero);
for (var i = 0; i < pointCount; i++)
{
positions[writeBegin + i] = (Vec3)(CartesianCoordinate)step + height;
step = step.AddTheta(-stepAround);
}
}