Root > GreenLab Model > Development > Automaton > Micro and Macro States

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-> Axis Typology Patterns
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GreenLab Course

Development

From Micro/Macro-states to the whole plant


The different levels of botanical plant structural elements (i.e. growth units, axis, architectural unit, and reiteration) can be generated using a dual scale automaton.
The first scale relies on micro-states building macro-states. Macro-state transitions define the second scale.

Macro-States


    We can build axes from a list of successive macro-states, representing the succession of growth units.


      Micro-states, Macro-states and growth units (Drawing X. Zhao, LIAMA, CASIA)
        This axis of three growth units repeats the same macro-state ((Mi1,3, 2) , (Mi1,2,1) ) three times.
      This construction remains similar to micro-states, except that the physiological age may vary, in order to model mutation.

      The automaton is thus a double scale automaton, building on the first scale macro-scale from micro-state sequences, and then the whole structure from macro-state sequences and branching.

      Note that micro-state and macro-state transitions are sufficient for building all levels of the plant architecture hierarchy: growth units, axis, architectural units and reiterations.


        Building the whole structure (Drawing X. Zhao, LIAMA, CASIA, and P. de Reffye, CIRAD)
          Left: Three macro-states are involved in this construction structure.
          Middle: This structure is obtained applying 5 cycles on the automaton. It characterizes the structure topology.
          Right: A 3D graphical output is computed from the topology, adding geometrical traits to the metamers, such as length, diameters, angles and colour attributes.

Definition

Dual Scale Automaton (Botanical Automaton)
Computer Sciences. A Dual-Scale or Botanical Automaton is a specific Dual Scale finite-state machine. A particular finite-state machine is defined by a list of its states, and the triggering condition for each transition. In a Botanical Automaton, two lists are used corresponding respectively to the micro-state transitions (at the phytomer level) and to the macro-state transitions (at the growth unit level). This notion was introduced by Xing Zhao in 2001.