[vtkusers] Speed of zoom

[James C. Robinson]

Dear All,

I may have posted this query already (as it is an ongoing wish list member).
I refer to the use of the mouse for zooming, panning etc. in a window.
Sometimes, for reasons I have not quite figured out (although I suspect it
has something to do with either the position of the camera focal point or
the object origin) the zoom capability (or pan) slows down such that a large
movement in the mouse cursor position results in a very small change (zoom
or pan) on the view. That is, I might be zoomed in to a certain distance
from an object (or detail of an object) and, depending on "how" I zoomed in,
the subsequent zoom power can vary from strong to very slight.

Has anybody (a) any idea what I am talking about and (b) any suggestions as
to what is going on and what one can do to control this apparently (though I
am sure it is not) arbitrary behaviour. NB: I cannot find any detailed
reference to the interactor type control involved here in the doc (it refers
only to "dolly" etc. when explaining zooming).

Many thanks,

Jim

______________________

James C. Robinson, PhD,
Chartered Engineer,
Kepler Simulation Systems Ltd.,
42 Rivergrove,
Glanmire, Co. Cork,
Eire

Tel:         +353-21-4822028
Tel:         +353-87-2393010
Fax:        +353-21-4822028
E-mail:     j.robinson at kepler-systems.com
______________________