Renamed the osg::EarthSky to osg::ClearNode to make it more obvious what

role it has play and make it more relevant to non vis-sim applications.

src/osgPlugins/osg/ClearNode.cpp

@@ -0,0 +1,90 @@
+#include "osg/ClearNode"
+
+#include "osgDB/Registry"
+#include "osgDB/Input"
+#include "osgDB/Output"
+
+using namespace osg;
+using namespace osgDB;
+
+// forward declare functions to use later.
+bool ClearNode_readLocalData(Object& obj, Input& fr);
+bool ClearNode_writeLocalData(const Object& obj, Output& fw);
+
+// register the read and write functions with the osgDB::Registry.
+
+RegisterDotOsgWrapperProxy g_EarthSkyProxy
+(
+    osgNew osg::ClearNode,
+    "EarthSky",
+    "Object Node EarthSky Group",
+    &ClearNode_readLocalData,
+    &ClearNode_writeLocalData
+);
+
+RegisterDotOsgWrapperProxy g_ClearNodeProxy
+(
+    osgNew osg::ClearNode,
+    "ClearNode",
+    "Object Node ClearNode Group",
+    &ClearNode_readLocalData,
+    &ClearNode_writeLocalData
+);
+
+bool ClearNode_readLocalData(Object& obj, Input& fr)
+{
+    bool iteratorAdvanced = false;
+
+    ClearNode& es = static_cast<ClearNode&>(obj);
+
+    if (fr.matchSequence("requiresClear"))
+    {
+        if (fr[1].matchWord("TRUE"))
+        {
+            es.setRequiresClear(true);
+            iteratorAdvanced = true;
+            fr+=2;
+        }
+        else if (fr[1].matchWord("FALSE"))
+        {
+            es.setRequiresClear(false);
+            iteratorAdvanced = true;
+            fr+=2;
+        }
+    }
+
+    osg::Vec4 vec4(0.0f,0.0f,0.0f,1.0f);
+    
+    if (fr[0].matchWord("clearColor") && 
+        fr[1].getFloat(vec4[0]) &&
+        fr[2].getFloat(vec4[1]) &&
+        fr[3].getFloat(vec4[2]) &&
+        fr[4].getFloat(vec4[3]))
+    {
+        es.setClearColor(vec4);
+        fr+=5;
+        iteratorAdvanced = true;
+    }
+
+    return iteratorAdvanced;
+}
+
+
+bool ClearNode_writeLocalData(const Object& obj, Output& fw)
+{
+    const ClearNode& es = static_cast<const ClearNode&>(obj);
+
+    fw.indent() << "requiresClear ";
+    if (es.getRequiresClear())
+    {
+        fw<<"TRUE"<< std::endl;
+    }
+    else
+    {
+        fw<<"FALSE"<< std::endl;
+    }
+    
+    fw.indent() << "clearColor "<<es.getClearColor()<< std::endl;
+
+    return true;
+}