Running L-Py without GUI

example.lpy

Axiom: A(1)

production:

derivation length: 6

A(n) :
  produce F(1)[+(30.)A(n+1)] [-(30.)A(n+1)]F(0.2);(3)@o(0.2)

endlsystem

Lpy_without_GUI.ipynb

test.py

"""A script that run lpy without the GUI.

The script will showcase different stages:
 - Load a lpy simulation program.
 - Iterate several times (defined by derivation length)
 - Generate the 3D representation


To install it, please create a conda environment (Python 2 is manatory)::

    conda create -n lpy -c openalea openalea.lpy

To run the script, launch ipython with qt

ipython
%gui qt
"""

# Import lpy library
from openalea.lpy import *
from openalea.plantgl.all import Viewer

# Create the simulation object from a given file
lsys = Lsystem("example.lpy")

n = lsys.derivationLength
tree = lsys.axiom
for i in range(n):
    # Apply rewritting rules on the tree -> One step of simulation
    tree = lsys.iterate(tree, 1)
    print(tree)

    # COmpute the scene interpretation
    # That is apply geometric rules to retrieve the 3D plant
    scene = lsys.sceneInterpretation(tree)

    # Display or save in a given format the scene
    Viewer.display(scene)
    # if it goes too fast, you can sleep or ask user to give an input
    #raw_input('next?')