anchor.diff:  a| Y-axis 
   a| Z-axis 
   
  -a|3-D rotation is a bit tricky (<<jme3/rotate#,learn details here>>). In short: You can rotate around three axes: Pitch, yaw, and roll. You can specify angles in degrees by multiplying the degrees value with `FastMath.DEG_TO_RAD`. +To roll an object 180° around the z axis: 
  +a|3-D rotation is a bit tricky (<<jme3/rotate#,learn details here>>). In short: You can rotate around three axes: Pitch, yaw, and roll. You can specify angles in degrees by multiplying the degrees value with `FastMath.DEG_TO_RAD`. +
  +To roll an object 180° around the z axis: 
   [source,java]
   ----
   thing.rotate( 0f , 0f , 180*FastMath.DEG_TO_RAD );
  
positive.code: a|+forward -backward
  
  |===
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  |===
  
  a| Scaling resizes Spatials 
  
negative.code: == How do I Troubleshoot Spatials?
  
  If you get unexpected results, check whether you made the following common mistakes:
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  |===
  
  a| Problem? 
  a| Solution! 
  
  a| A created Geometry does not appear in the scene. 
  a| Have you attached it to (a node that is attached to) the rootNode? +
  Does it have a Material? +
  What is its translation (position)? +
  Is it behind the camera or covered up by another Geometry? +
  Is it too tiny or too gigantic to see? +
  Is it too far from the camera? (Try link:http://javadoc.jmonkeyengine.org/com/jme3/renderer/Camera.html#setFrustumFar(float)[cam.setFrustumFar](111111f); to see further) 
  
  a| A Spatial rotates in unexpected ways. 
  a| Did you use radian values, and not degrees? (If you used degrees, multiply them with FastMath.DEG_TO_RAD to convert them to radians)  +
  Did you create the Spatial at the origin (Vector.ZERO) before moving it? +
  Did you rotate around the intended pivot node or around something else? +
  Did you rotate around the right axis? 
  
  a| A Geometry has an unexpected Color or Material. 
  <a| Did you reuse a Material from another Geometry and have inadvertently changed its properties? (If so, consider cloning it: mat2 = mat.clone(); )  
  