This paper introduces an intuitive method for the modelling of free-form architecture with planar facets. The method, called Marionette by the authors, takes its inspiration from descriptive geometry and allows one to design complex shapes with one projection and the control of elevation curves.

The proposed framework only deals with linear equations and therefore achieves exact planarity, for quadrilateral, Kagome, and dual Kagome meshes in real-time. Remarks on how this framework relates to continuous shape parameterisation and on possible applications to engineering problems are made.