anchor.diff:  
   *Using tree data*
   
  -In the SimpleTreeTest.java is an example of how to set up a treeloader to use density maps to generate tree-data through the *MapGrid* data-provider. You do not have to worry about this stuff if you use density maps. 
  +In the SimpleTreeTest.java is an example of how to set up a treeloader to use density maps to generate tree-data through the *MapGrid* data-provider. You do not have to worry about this stuff if you use density maps.
   
   There will be info here on how to use the alternative *DataGrid* data-provider later.
  
positive.code: 
  == PhysicsTest.java
  
  There's another file in the demo project called PhysicsTest.java. In that file you can see how collision-shapes are added to the trees. 
  
  When you create a tree-layer through *treeLoader.createTreeLayer(Spatial spat, boolean usePhysics)*, you supply the model and a boolean whether or not to use physics. If you want to enable collision physics, look in that file how it's done.
  
  There are some general principles:
  
  1) In order to enable collision physics _at all_, you first need to set up a physics space. There's a great tutorial available in the tutorials section of the jME wiki: <<jme3/beginner/hello_physics#,jme3:beginner:hello_physics>>.
  
  2) If you want to enable physics with the forester, you need to provide the physics space to the Forester object. This is shown in the PhysicsTest.java file.
  
  
negative.code: = The Tree System
  :revnumber: 2.0
  :revdate: 2020/07/15
  
  
  Here you will learn how to use the tree system.
  