Update help files

git-svn-id: svn://cook.msm.cam.ac.uk:745/thrust3d/thrust3d@104 84d2e878-0bd5-11dd-ad15-13eda11d74c5

1 files changed, 17 insertions, 2 deletions

diff --git a/README b/README
index 9e28195..d5cbef9 100644
--- a/README
+++ b/README
@@ -17,7 +17,22 @@ modern graphics hardware to heighten the feeling.  I learnt a lot of OpenGL grap
 in the course of my doctoral studies for visualising my research results, but none of this allowed me to use any of the
 advanced capabilities available.  Thrust3D was an outlet for this, and here is the result.
 
-For installation details, see the 'INSTALL' file.  Basically it's just ./configure / make / sudo make install.
+Installation
+============
+
+For installation details, see the 'INSTALL' file.  Basically it's just the usual ./configure / make / sudo make install.
+
+You will almost certainly need working 3D acceleration (direct rendering) to play Thrust3D at a reasonable speed.  To
+see if you have this, run 'glxinfo' in a terminal and see if it says 'direct rendering: yes' or not.  If not, you most
+likely need to install 3D drivers for your graphics card.  Linux drivers for NVIDIA and ATI cards come from the
+respective manufacturers' websites.  For Intel cards, look up the Linux DRI project.  Drivers *might* be included in
+your distribution.
+
+Thrust3D runs at full speed, but only just, on my ATI Mobility Radeon X600 card.  This is the primary development
+system.  It also works fine on my NVIDIA Quadro FX540.  Both of these are 'entry-level' cards with fairly comparable
+specifications.  If you have something beefier, great.  If not, you can still play - you might just need to disable
+a few features (if that doesn't happen automatically): see the output from 'thrust3d --help' for details of things you
+can disable.  You should also try turning the resolution down (thrust3d --resolution 640 and so on).
 
 Controls:
 
@@ -31,6 +46,6 @@ Aim:
 
 	Fly around the highly radioactive remains of the Mars nuclear power station and collect the coloured flashing
 	radiactive debris.  Don't crash into any walls or other objects or your craft will explode.  Land only on the
-	glowing red landing panels.
+	glowing landing panels.