Printed Perforated Lampshades for Continuous Projective Images

TOG 2016 (Presented on SIGGRAPH 2016)

Haisen Zhao1    Lin Lu1    Yuan Wei1     Dani Lischinski2    Andrei Sharf3    Daniel Cohen-Or4    Baoquan Chen1

1Shandong University   2Hebrew University of Jerusalem   3Ben-Gurion University   4Tel-Aviv University  

A 3D-printed lampshade projecting a continuous grayscale image of Marilyn Monroe. From left to right: the target image, the 3D-printed perforated lampshade, the lampshade with a light source inside, and the resulting projection onto a nearby wall. The superposition of the individual light footprints on the wall forms a visually continuous image.



We present a technique for designing 3D-printed perforated lampshades that project continuous grayscale images onto the surrounding walls. Given the geometry of the lampshade and a target grayscale image, our method computes a distribution of tiny holes over the shell, such that the combined footprints of the light emanating through the holes form the target image on a nearby diffuse surface. Our objective is to approximate the continuous tones and the spatial detail of the target image, to the extent possible within the constraints of the fabrication process.

To ensure structural integrity, there are lower bounds on the thickness of the shell, the radii of the holes, and the minimal distances between adjacent holes. Thus, the holes are realized as thin tubes distributed over the lampshade surface. The amount of light passing through a single tube may be controlled by the tube’s radius and by its orientation (tilt angle). The core of our technique thus consists of determining a suitable configuration of the tubes: their distribution across the relevant portion of the lampshade, as well as the parameters (radius, tilt angle) of each tube. This is achieved by computing a capacity-constrained Voronoi tessellation over a suitably defined density function, and embedding a tube inside the maximal inscribed circle of each tessellation cell.






This work is partially supported by China National 973 Program (2015CB352501), Natural Science Foundation of China (61232011, 61572291, 61332015), NSFC-ISF (61561146397), and the Israel Science Foundation (ISF).



@article {zhao_sig16,
author = {Haisen Zhao and Lin Lu and Yuan Wei and Dani Lischinski and Andrei Sharf and Daniel Cohen-or and Baoquan Chen},
title = {Printed Perforated Lampshades for Continuous Projective Images},
journal = {ACM Transactions on Graphics (Special Issue of SIGGRAPH)},
volume = {35},
number = {5},
pages = {Article No. 154},
year = {2016}