Imagine I have a origin Point A at some certain coordinate at an height of 0m.

Now I want to get the Vector between the camera position (Point B) and that Point A.

Usually I could just use

`Cartesian3.subtract(PointB, PointA)`

, but I do not want to have it in world space, but local Point A space.

E.g.: If camera is exactly 10 meters above Point A and 1m to the east, I would want to get the Vector (1, 0, 10).

So I thought I can use

`Cesium.Transforms.eastNorthUpToFixedFrame(PointA, Ellipsoid.WGS84, transform)`

and `Matrix4.multiplyByPointAsVector(transform, PointB, localCamVector)`

.

But this is not working yet.

Then I also tried to `multiplyByPointAsVector`

the PointA with `Matrix4.multiplyByPointAsVector(transform, PointA, localOriginVector)`

and subtracted both with `Cartesian3.subtract(localCamVector, localOriginVector)`

.

This value seems to be more correct since the value are not thousands of meters long when I have the camera close to the origin, but still is not correct. When I move the camera to the east I can still see that x,y,z is manipulated and not just x.