> Wouldn't it depend on the resolution of the images and the size of the 
> objects in question?

No, it's a simple fact that with only two photos there is never enough 
information to make a 3D model and be sure it is correct.  Your brain always 
has to add in unseen or assumed details, which most of the time are 
believably correct, but I guess this is extremely hard for a computer to do 
(as it's based on your experiences etc).

Using your grass example, I'm sure lots of blades will be hidden by others 
in the view from one eye, but plainly visible in the view from the other 
eye - how can a computer know what to do with that?  Even if the computer 
could somehow match up individual blades of grass between the two images, 
the partially hidden ones it would just have to guess where they were within 
a certain range of positions.

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