Working on adding a top leve Doxygen docs introduction.

Doxyfile

@@ -64,14 +64,14 @@ EXTRACT_STATIC         = NO
 # various overviews, but no documentation section is generated. 
 # This option has no effect if EXTRACT_ALL is enabled. 
 
-HIDE_UNDOC_MEMBERS     = NO
+HIDE_UNDOC_MEMBERS     = YES
 
 # If the HIDE_UNDOC_CLASSES tag is set to YES, Doxygen will hide all 
 # undocumented classes that are normally visible in the class hierarchy. 
 # If set to NO (the default) these class will be included in the various 
 # overviews. This option has no effect if EXTRACT_ALL is enabled. 
 
-HIDE_UNDOC_CLASSES     = NO
+HIDE_UNDOC_CLASSES     = YES
 
 # If the BRIEF_MEMBER_DESC tag is set to YES (the default) Doxygen will 
 # include brief member descriptions after the members that are listed in 
@@ -298,6 +298,7 @@ WARN_LOGFILE           =
 # with spaces. 
 
 INPUT                  = \
+        DoxygenMain.cxx \
 	simgear/bucket \
 	simgear/compiler.h \
 	simgear/constants.h \
@@ -308,11 +309,11 @@ INPUT                  = \
 	simgear/math \
 	simgear/misc \
 	simgear/route \
+	simgear/scene \
 	simgear/screen \
 	simgear/serial \
 	simgear/sg_inlines.h \
 	simgear/sg_traits.hxx \
-	simgear/sky \
 	simgear/threads \
 	simgear/timing \
 	simgear/xml
@@ -334,7 +335,7 @@ RECURSIVE              = YES
 # excluded from the INPUT source files. This way you can easily exclude a 
 # subdirectory from a directory tree whose root is specified with the INPUT tag. 
 
-EXCLUDE                = simgear/metakit simgear/zlib
+EXCLUDE                = simgear/scene/sky/clouds3d
 
 # If the value of the INPUT tag contains directories, you can use the 
 # EXCLUDE_PATTERNS tag to specify one or more wildcard patterns to exclude 
@@ -480,7 +481,7 @@ ENUM_VALUES_PER_LINE   = 4
 # JavaScript and frames is required (for instance Netscape 4.0+ 
 # or Internet explorer 4.0+). 
 
-GENERATE_TREEVIEW      = YES
+GENERATE_TREEVIEW      = NO
 
 # If the treeview is enabled (see GENERATE_TREEVIEW) then this tag can be 
 # used to set the initial width (in pixels) of the frame in which the tree