public void ViewChanged(DoubleVector lookDirection)
{
if (_marker2D != null)
{
_viewport.Children.Remove(_marker2D);
}
if (_marker2D == null)
{
_marker2D = new ScreenSpaceLines3D();
_marker2D.Color = UtilityWPF.ColorFromHex("60A0A0A0");
_marker2D.Thickness = 4d;
}
_marker2D.Clear();
RotateTransform3D transform = new RotateTransform3D(new QuaternionRotation3D(Math3D.GetRotation(new DoubleVector(0, 0, 1, 0, -1, 0), lookDirection)));
#region Marker 2D
double orthDist = (_sizeMult * _field.Size * 1.1d) / 2d;
double cornerDist = (_sizeMult * _field.Size * .2d) / 2d;
// TopLeft
Point3D corner = transform.Transform(new Point3D(-orthDist, -orthDist, -orthDist));
Vector3D direction = transform.Transform(new Vector3D(cornerDist, 0, 0));
_marker2D.AddLine(corner, corner + direction);
direction = transform.Transform(new Vector3D(0, cornerDist, 0));
_marker2D.AddLine(corner, corner + direction);
//TopRight
corner = transform.Transform(new Point3D(orthDist, -orthDist, -orthDist));
direction = transform.Transform(new Vector3D(-cornerDist, 0, 0));
_marker2D.AddLine(corner, corner + direction);
direction = transform.Transform(new Vector3D(0, cornerDist, 0));
_marker2D.AddLine(corner, corner + direction);
//BottomRight
corner = transform.Transform(new Point3D(orthDist, orthDist, -orthDist));
direction = transform.Transform(new Vector3D(-cornerDist, 0, 0));
_marker2D.AddLine(corner, corner + direction);
direction = transform.Transform(new Vector3D(0, -cornerDist, 0));
_marker2D.AddLine(corner, corner + direction);
//BottomLeft
corner = transform.Transform(new Point3D(-orthDist, orthDist, -orthDist));
direction = transform.Transform(new Vector3D(cornerDist, 0, 0));
_marker2D.AddLine(corner, corner + direction);
direction = transform.Transform(new Vector3D(0, -cornerDist, 0));
_marker2D.AddLine(corner, corner + direction);
_viewport.Children.Add(_marker2D);
#endregion
// Camera
_camera.Position = transform.Transform(new Point3D(0, 0, (_sizeMult * _field.Size * -4d) / 2d));
_camera.LookDirection = lookDirection.Standard;
_camera.UpDirection = lookDirection.Orth;
// Remember it
_lookDirection = lookDirection;
}