Re #771 Updated INSTALL.txt instruction for new OPTION_OSGGRAPH CMake option

git-svn-id: https://svn.code.sf.net/p/speed-dreams/code/trunk@5086 30fe4595-0a0c-4342-8851-515496e4dcbd

Former-commit-id: e9e6df93758bc91003d86007efb596d2729094de
Former-commit-id: e81db47b8e34cbae63e27b0395ac071e7a06c538

INSTALL.txt

@@ -188,7 +188,13 @@ The Speed Dreams Team.
 
         - OPTION_MENU_MUSIC:BOOL :
             Enable building with the new Menu Music enabled (def: OFF)
-            Note: This requires libogg, libvorbis, and libvorbisfile (these dependencies are new for 2.1)
+            Note: This requires new 3rd party libs : libogg, libvorbis, and libvorbisfile
+
+        - OPTION_OSGGRAPH:BOOL :
+            Enable building of the WIP new OpenSceneGraph-based graphics module 'osggraph' (def: OFF)
+            Note: This requires new 3rd party libs : OpenSceneGraph
+            Hint: Once built, to load it at race-time, substitute 'ssggraph' by 'osggraph'
+                  in <user settings>/config/raceengine.xml
 
         - OPTION_TRACE:BOOL :
             Full run-time traces if ON (def: ON)
@@ -427,6 +433,8 @@ Note that these instructions work under Windows XP 32 SP2/SP3 ; some tweaks wigh
   f.  Download the "MinGW 4.7.0" release of the Speed Dreams "3rdParty" binary package from SF.net
         http://sourceforge.net/projects/speed-dreams/files/3rd%20party/MinGW%204.7.0/
       (it contains necessary 3rd party libs compiled with/for MinGW 4.7.0)
+      Note: If you plan to also build and run the new OpenSceneGraph-base graphics module (osggraph),
+            you should also download the "OSG extension" of this 3rdparty package (same location).
 
   g.  Install it in the right folder :
 
@@ -434,6 +442,8 @@ Note that these instructions work under Windows XP 32 SP2/SP3 ; some tweaks wigh
 
          $ cd /usr
          $ tar xvfz .../3rdParty-2.1-win32-mingw470-g-O2.tar.gz
+         # And if you plan to build osggraph (see above) :
+         $ tar xvfz .../3rdParty-2.1-osg-win32-mingw470-O2.tar.gz
 
          Note: this will populate the MSYS /usr/local tree, just as under Linux :-)
 
@@ -446,8 +456,10 @@ Note that these instructions work under Windows XP 32 SP2/SP3 ; some tweaks wigh
         - open 3rdParty-2.1-win32-mingw470-g-O2.tar.gz in your favorite archive manager
           (7zip is an excellent tool for this : http://www.7-zip.org/),
         - extract the whole "local" folder into the "sd" folder,
+        - (same for 3rdParty-2.1-osg-win32-mingw470-O2.tar.gz if needed)
         - rename it to "3rdParty".
 
+
   h.  Run CMake to configure the build (here we assume CMake 2.8, but newer versions should work) :
 
       * If you are using MSYS, in the MSYS shell :
@@ -459,6 +471,8 @@ Note that these instructions work under Windows XP 32 SP2/SP3 ; some tweaks wigh
 
         Note: The 'Release' build gives you -O3-optimised binaries.
 
+        Note: See II.2.c above for more about possible / useful CMake arguments.
+
       Or
 
       * If you are using QtCreator (solution 1) :