is that just a 3D flat image performed on a transparent screen? In that case, it will look very flat and strange if we look at it from a acute (maybe less than 45 degree) angle but not 90 degree, won't it?
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After doing a little reseach I've determined that the music videos for Hatsune Miku are not projected in real life and recorded with a camera. It is a CG model added to videos, so there is no screen technology at work. You are correct to wonder why an acute angle does not change the shape, it's because it does not use a real display. As for real 3D technology that performs similar functions it has to have multiple perspective 3D to work properly from different angles. Holograms can create such an effect but the problem is that they only work when recording real life objects and are difficult to produce for moving images and for large images. Holografika has created a display that demonstrates linear parallax but they do't have big enough displays to display a person and the skeweing angle would be visible if the viewers are offset from display in a direction perpendicular to the parallax effect (like on a stage). I wrote a book about another potential way to create volumetric 3D and 4D images but of course I just wrote it so it does not exist as a technology yet. Other options are integral imaging (which is like lenticular lens technology), but that only has a limited series of viable viewing angles. None of these technolgoies have yet devloped enough to create the appearance of a 3D human sized image from any angle.
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