Foreword to the Special Issue on Shape Modeling International 2021 (SMI2021)

This special section of Computers & Graphics (C&G), features the full papers presented at the Shape Modeling International conference - SMI 2021 (https://smi2021.github.io/). Due to the pandemic, and for the second year in a row, SMI was convened online, and this year was hosted by Texas on November 14-16, 2021 (see Fig. 1).