From Volker Walkiewicz (with tweaks from Robert Osfield):

Fix to the update of the error metrics on the edges in the simplification mesh that are affected by an edge collapse.

Addition of 'n' and 'p' keyboard control in osgsimplifier example to allow users to control the sample ratio manually.

include/osgUtil/Simplifier

@@ -36,8 +36,7 @@ class OSGUTIL_EXPORT Simplifier : public osg::NodeVisitor
 
         void setMaximumError(float error) { _maximumError = error; }
         float getMaximumError() const { return _maximumError; }
-            
-
+        
         class ContinueSimplificationCallback : public osg::Referenced
         {
             public: