Better positioning of camera #44
Description
At application start, the camera is very zoomed in. It would be great to position the camera far enough to see the whole axial plane, based on the dimensions of the image.
Also, when locked in a 2D view, it would be nice if we could keep the distance between the camera and the slice of interest constant when slicing (right now, if the camera is very close, it would be possible to move the slice behind the camera and get a black window).