[JAVA3D] Mouse Zoom does not work with PARALLEL_PROJECTION?

[Jasmine Kwok]

Dear all,   does anybody knows if View.PARALLEL_PROJECTION works with MouseZoom?   I have a program which uses MouseZoom, MouseTranslate and MouseRotate. They work fine with both parallel and perspective projection. However, when I change the projection policy to PARALLEL_PROJECTION, only the zoom does not work.  Or do I have to set any other attributes?   Would greatly appreciate your help. Thank you.   Jasmine Kwok