I've found an avisynth script pretending to do 2D -> 3D conversions, but that was just a joke (stupid IMO)! The only thing that it does is to duplicate the 2 images, then it uses a plugin to deform the images slightly (in a parallelogram shape) and it recombines them to SBS. When played on a 3D TV, the image appears behind the surface of the screen, and produces that "aquarium effect" typical of the 3D movies. But the image is still perfectly flat, with no 3D at all. There is NO WAY to create real 3D with simple tricks like that. And as far as I know, there in no "serious" avisynth plugin to convert to 3D. Forget avisynth.
As far as I know, all Windows software that can theoretically convert to 3D are not free. And the serious ones are extremely expansive, and reserved to professionals.
@everybody: My PC is almost restored to good shape now. But the culprit was not a virus, but the Panda antivirus! (See
here.) I have still a bunch of missing exe, and I need to re-install them, but I should be able to read the forums normally, and I will try now to continue to develop BD3D2MK3D...