Diffraction refers to a variety of phenomena occurring when a wave encounters an obstacle and bends around it. Diffractive optics are widely used today in imaging, holography, microscopy and manufacturing. Previous work has shown that extending diffractive optics from two dimensions to three dimensions enables new functionality and improves system performance. The paper suggests a way to make the two-dimensional waves three-dimensional in real time with a simple modification to existing devices controlled with a computer.