public static void AddArrow(this DynamicPrimitive dynamicPrimitive, Vector3 start, Vector3 end, Color color, float lineWidth)
{
const float Ratio = 0.2f;
var mid = Vector3.Lerp(end, start, Ratio);
var head = (end - start).Length() * Ratio;
dynamicPrimitive.AddLine(start, mid, null, color, lineWidth);
dynamicPrimitive.AddSolidCone(Vector3.Zero, head, head * 0.5f, 24,
MatrixHelper.CreateRotation(Vector3.Up, Vector3.Normalize(end - start)) *
Matrix.CreateTranslation(mid), color);
}