> I don't think it's a hologram if it's not created with a laser. At university, we calculated the microscopic pattern of holograms and printed them in high re

> I don't think it's a hologram if it's not created with a laser. At university, we calculated the microscopic pattern of holograms and printed them in high resolution on transparent foil. It worked surprisingly well. Back then, we investigated doing the calculation on GPUs (~2005). You could store the complex numbers needed in RGBA textures, and then had to combine a large number of textures, each one a Fourier transform of a point source or primitive object. We ended up doing it on the CPU for simplicity, but now with general-purpose shaders, it should be revisited. Also, someone should really try to combine computer generated holograms with high-DPI displays!