[Paraview] camera animation Paraview doesn't work

[wang]

Dear Paraview users,

I'm using Paraview.3.14. What I tried is to use "camera path" or 
Interpolate camera locations" to zoom in or out of the object. But so 
far it is only possible to rotate the object. No matter what values the 
"camera position" gets the object doesn't goes away or near from the view.

I saw some people had the same problem before, but haven't seen any 
answer to this. Has anyone a solution to this?

Thanks in advance!
Xueli