//-------------------------------------------------------------------------
/// <summary>
/// Update this Entity's view direction, which will indicate how it's drawn.
/// </summary>
public void updateDirectionView(Vector3 directionVector)
{
// Project as unit vector onto XZ plane
directionVector.Y = 0.0f;
directionVector = Vector3.Normalize(directionVector);
// Grab cosine of angle between vector and -Z axis (north/south axis)
float cosTheta = Vector3.Dot(-Vector3.UnitZ, directionVector);
if (Math.Abs(cosTheta) < 0.0005f)
{
cosTheta = 0.000f;
}
// Find angle and update direction
float theta = (float)Math.Acos(cosTheta);
if (directionVector.X > 0.0f)
{
theta = (float)(Math.PI + (Math.PI - theta));
}
_directionView = GameLevelManager.directionViewFromAngle(theta);
}
//-------------------------------------------------------------------------
/// <summary>
/// Update the direction enum, which indicates where the camera
/// is pointing
/// </summary>
protected void updateDirection()
{
_dir = GameLevelManager.directionViewFromAngle(_rotationZ);
}