anchor.diff:  
   X = start height, +
   Y = end height, +
  -Z = texture scale. +
  +Z = texture scale.
  +
   Texture regions can overlap.
   
   For example:
  
positive.code: Unshaded.j3md
  a| Standard, non-illuminated Materials.
  
  Use this for simple coloring and texturing, glow, and transparency.
  
  See also: <<jme3/beginner/hello_material#,Hello Material>>
  a| *Texture Maps* +
  
negative.code: Particle.j3md
  a| Used with texture masks for particle effects, or for point sprites.
  
  The Quadratic value scales the particle for perspective view. (link:https://github.com/jMonkeyEngine/jmonkeyengine/blob/master/jme3-core/src/main/java/com/jme3/effect/ParticleEmitter.java[formula])
  
  Does support an optional colored glow effect.
  
  