[vtkusers] VTK volume origin same as 2d image origin?

[Mark Wyszomierski]

Hello,

A simple question - I allocated a 3 dimensional volume in which I'd
like to write a stack of 2d images. The origin of my 2d images (0,0)
is the upper left hand corner of the image.

When I write these 2d images from their origin into the volume origin
starting at (0,0,0) in the volume, it seems my volume is flipped
around when complete. Should I treat another corner of my 2d images as
the origin to escape this flipping?

Thanks!