Goto, YuichiroPasko, Alexander2015-11-112015-11-1120001017-4656https://doi.org/10.2312/egs.20001012Convolution surfaces enable the user to model complex free-form shapes. Due to analytical solutions for some kernel functions and skeletal elements, it is possible to model convolution surfaces interactively. An extendable user interface allows the user to design models using different types of convolution surfaces. New primitives can be easily bound to the modeller using the proposed binding technique. Models generated in HyperFun language can be exchanged between modelling tools on several platforms.