With concerns such as sustainable development or climat changes, controling and understanding plant growth has become important society matters. Computer models that uses plant architecture, called "functional-structural plant models" (FSPMs), have become more and more widespread. Contrariwise to agronomic models based on the relations between few parameters, FSPMs allow to assess the relation between the three-dimensional structure of plants and the physical and ecophysiological processes that drive their development. However, plant architecture, and particularly its geometry, is rather...