| This is Patch311-06-voltex. It fixes a problem
with the simultaneous rendering of more than one image volume and the '2D textures'
option switched on. The foreground background sorting was not handled properly. This
has now been corrected and improved in so far that axis aligned transformations of the
objects will bee rendered correctly. Note that oblique tranformations, i.e. transformations
that include rotations cannot be handled in correct way in 2D texture mode by principle.
Use 3D textures for those cases if possible.
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