Added default colour and normal definition to the Geometry draw to prevent state

inheritance of these attributes from causing problems of Geometry which arn't
fully defined.

src/osg/Geometry.cpp

@@ -412,6 +412,10 @@ void Geometry::drawImmediateMode(State& state)
     unsigned int secondaryColorIndex = 0;
     unsigned int fogCoordIndex = 0;
 
+    // if no values are defined for normal and color provide some defaults...
+    if (_normalBinding==BIND_OFF) glNormal3f(0.0f,0.0f,1.0f);
+    if (_colorBinding==BIND_OFF) glColor4f(1.0f,1.0f,1.0f,1.0f);
+
     if (areFastPathsUsed())
     {