Richard Zhang, Simon Fraser University (IMAGE) Simon Fraser University Caption Just in time for Christmas, Simon Fraser University computing science professor Richard Zhang reveals how to print a 3-D Christmas tree efficiently and with zero material waste, using the world's first algorithm for automatically decomposing a 3-D object into what are called pyramidal parts. Credit SFU University Communications Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.