From Paul Martz, "Here's my proposed change regarding the osg-users post "small feature culling threshold". I've updated the comments and brought the default values into agreement, but didn't bother to add the environment variable support."

include/osg/CullSettings

@@ -217,7 +217,8 @@ class OSG_EXPORT CullSettings
         /** Get the LOD bias.*/
         float getLODScale() const { return _LODScale; }
 
-        /** Set the Small Feature Culling Pixel Size.*/
+        /** Threshold at which small features are culled.
+        \param value Boulding volume size in screen space. Default is 2.0. */
         void setSmallFeatureCullingPixelSize(float value) { _smallFeatureCullingPixelSize=value; applyMaskAction(SMALL_FEATURE_CULLING_PIXEL_SIZE); }
 
         /** Get the Small Feature Culling Pixel Size.*/

include/osg/CullingSet

@@ -161,6 +161,8 @@ class OSG_EXPORT CullingSet : public Referenced
         Vec4& getPixelSizeVector() { return _pixelSizeVector; }
         const Vec4& getPixelSizeVector() const { return _pixelSizeVector; }
 
+        /** Threshold at which small features are culled.
+        \param value Boulding volume size in screen space. Default is 2.0. */
         void setSmallFeatureCullingPixelSize(float value) { _smallFeatureCullingPixelSize=value; }
         
         float& getSmallFeatureCullingPixelSize() { return _smallFeatureCullingPixelSize; }