anchor.diff:  
   jME defines the Plane as ax + by + cz = -d. Therefore, during creation of the plane, the normal of the plane (a,b,c) and the constant d is supplied.
   
  -The most common usage of Plane is <<jme3/introduction_to_the_camera#,Camera>> frustum planes. Therefore, the primary purpose of Plane is to determine if a point is on the positive side, negative side, or intersecting a plane.
  +The most common usage of Plane is <<jme3/advanced/camera#,Camera>> frustum planes. Therefore, the primary purpose of Plane is to determine if a point is on the positive side, negative side, or intersecting a plane.
   
   Plane defines the constants:
   
  
positive.code: 
  Ray defines a line that starts at a point *A* and continues in a direction through *B* into infinity.
  
  This Ray is used extensively in jME for <<jme3/picking#,Picking>>. A Ray is cast from a point in screen space into the scene. Intersections are found and returned. To create a ray supply the object with two points, where the first point is the origin.
  
  
  === Example 1 - Create a Ray That Represents Where the Camera is Looking
  
negative.code: 
  === Usage
  
  jME's Triangle class is a simple data class. It contains three <<jme3/terminology.html#vectors#,Vector3f>> objects that represent the three points of the triangle. These can be retrieved via the `get` method. The `get` method, obtains the point based on the index provided. Similarly, the values can be set via the `set` method.
  
  
  === Example 1 - Creating a Triangle
  