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{{howhard>2}}
====== Headless in GroIMP ======

Find more information on the Headless implementation and functions [[01_user_documentation:10_additional_interfaces:headless|here]].

===== Download example =====

You can find an example 
[[https://wwwuser.gwdg.de/~groimp/grogra.de/gallery/Technics/renderHeadlessDemo.html|here]].

Download the example project and run in with ''java -Xverify:none -jar core.jar --headless PATH/TO/THE/MODEL.gsz''.
The model will run in background, grow few steps of the plant model, and export several views for each step.


===== Create the model =====

You can create the default RGG model from the GroIMP ''file> new> new RGG project''. 
You then need to add some methods in the model that will be called by GroIMP.
The ''startup()'' method is called when the project is open. We use it to call the ''runLater(Object)'' methods where the actual code is going to be processed. 

<code java>
protected void startup()
{
	super.startup();
	if (de.grogra.pf.boot.Main.getProperty("headless") != null)
	{
		runLater(null);
	}
}

	
protected void run(Object info)
{
	// Stuff to do...
	closeWorkbench();
}
</code>


==== Run headless ====

Save the model, then run it with the command: ''java -jar core.jar --headless PATH/TO/THE/MODEL.gsz''.