Image and text projection through lens surface
The surface of these resin cubes are precision milled into optical contour to focus exact messages and graphics on a surface. Inspire by similar research, This method are capable of reproducing single characters, cursive words and even grey scale images.
Light rays are maps onto target images to obtain a surface normal map. The normal map is then translate to the mill surface to refract light accordingly. You can download the definition and code of this project here.
Light ray mapping
Surface normal map