Update PlottingGraphsWithMatplotlibAndUnrealEnginePython.md

Author: Roberto De Ioris

tutorials/PlottingGraphsWithMatplotlibAndUnrealEnginePython.md

@@ -62,6 +62,8 @@ Time to check if all is working well.
 
 We will start by generating a texture asset. The content of this texture will be generated by matplotlib.
 
+You can use the included python editor to edit your scripts (it is under Wndow/Python Editor), or your favourite one SsublimeText, Vim, PyCharm...) just ensure scripts are under the Content/Scripts directory of your project.
+
 The steps are generating a texture in memory, plotting the graph, transferring the graph data into texture memory, save it as an asset and opening the related editor:
 
 ```python
@@ -138,6 +140,13 @@ The first blueprint we are about to create, is the 'carpet' (we call it Graph_Bl
 
 ![Graph Blueprint](https://github.com/20tab/UnrealEnginePython/blob/master/tutorials/PlottingGraphsWithMatplotlibAndUnrealEnginePython_Assets/graph_blueprint.png)
 
+As you can see it is really simple:
+
+* add a StaticMeshComponent (as root if you want) with a plane as the mesh and the material instance you created before
+* add a Python component with the module as 'plotter' and the class as 'PlotComponent' (this is where the matplotlib part will be)
+* add an event dispatcher called 'OnGraphDataUpdated' (this will be triggered whenever the character steps over a cube)
+
+You can now create (again into Content/Scripts) the plotter.py python script
 
 ```python
 import unreal_engine as ue
@@ -175,6 +184,10 @@ class PlotComponent:
         self.texture.texture_set_data(self.fig.canvas.buffer_rgba())
 ```
 
+The only relevant part is the update_graph function that is triggered by the 'OnGraphDataUpdated' event dispatcher.
+
+This function receives as the 'platform' argument the Actor triggering the event. This Actor (that we will create in the next phase), expose the counters of the overlapping cubes. We use that values to re-generate our pie chart and uploading it into texture memory whenever the event is triggered 
+
 ### The "Plotter Platforms"
 
 ### Playing it