private void AddHead()
{
Vector3 newheadvelocity;
if (elementList.Count > 0) // set old head element color.
{
var oldeadelement = elementList[elementList.Count - 1];
oldeadelement.Color = color;
newheadvelocity = objectToFollow.Velocity;
}
else
{
newheadvelocity = Vector3.Zero;
}
// add new white head element.
var newelement = new BillboardChain.Element();
newelement.Position = objectToFollow.OldPosition;
newelement.Width = maxwidth;
newelement.Color = ColorEx.White;
Chain.AddChainElement(0, newelement);
elementList.Add(newelement);
elementPositions.Add(new Ray(newelement.Position, newheadvelocity));
}
