请问wpf中使用helixtoolkit让3D模型自旋同时绕着某轴旋转如何设置?下面是代码
```c#
public RotateTransform3D rotateTransform3D(double startAngle,double endAngle)
{
var initialRotation = new RotateTransform3D(new AxisAngleRotation3D(new Vector3D(0, 1, 0), 0));
var rotateanimation = new Rotation3DAnimation();
var axis = new AxisAngleRotation3D(new Vector3D(-1, 0, 0), startAngle );
var axis1 = new AxisAngleRotation3D(new Vector3D(-1, 0, 0), endAngle);
rotateanimation.From = axis;
rotateanimation.To = axis1;
rotateanimation.Duration = TimeSpan.FromSeconds(5);
rotateanimation.RepeatBehavior = new RepeatBehavior(1);
initialRotation.BeginAnimation(RotateTransform3D.RotationProperty, rotateanimation);
return initialRotation;
}