Merged the physics branch back to trunk. There should be no change at

this stage for users.
The physics branch added a few new stability options (which are disabled
by default), fixed bug and reproducing history files when using physics
replay, using --log=file command line option. See log on the physics
branch for full details.


git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@10292 178a84e3-b1eb-0310-8ba1-8eac791a3b58

data/stk_config.xml

@@ -49,15 +49,15 @@
   <!-- The title music. -->
   <music title="main_theme.music"/>
 
-  <!-- Mostly for debugging: maximum number of history entrie$a -->
+  <!-- Mostly for debugging: maximum number of history entries -->
   <history max-frames="10000"/>
 
   <!-- Skidmark data: maximum number of skid marks, and
-       time for skidmars to fade out. -->
+       time for skidmarks to fade out. -->
   <skid-marks max-number="100"  fadeout-time="60"/>   
  
   <!-- Defines when the upright constraint should be acctive, it's
-       disables when the kart is more than this value from the track. -->
+       disabled when the kart is more than this value from the track. -->
   <near-ground distance="2"/> 
 
   <!-- How long the end animation will be shown. -->
@@ -231,9 +231,12 @@
     <mass value="225"/>
 
     <!-- Suspension related values. stiffness: kart's suspension stiffness.
-         rest Length of suspension when at rest. travel-cm: maximum 
-         movement of suspension - in cm!!  -->
-    <suspension stiffness="248.0" rest="0.2" travel-cm="19"/>
+         rest: Length of suspension when at rest. 
+         travel-cm: maximum movement of suspension - in cm!! 
+         exp-string-response: dampen the suspension spring reaction 
+            exponentially  -->
+    <suspension stiffness="248" rest="0.2" travel-cm="19"
+         exp-spring-response="false"/>
 
     <!-- Wheel related parameters: damping-relaxation/compression: for
          bullet, damping parameters. Radius and width of wheel.
@@ -253,26 +256,22 @@
     <friction slip="10000000"/>
 
     <!-- Values related to stability of the chassis: damping, and reduced
-         impact of roll. -->
+         impact of roll. 
+         downward-impulse-factor: A speed proportional impulse applied each
+           frame that pushes the vehicle onto the ground. 
+         track-connection-accel: An artificial force that pulls a wheel to
+           the ground if its off ground. Reduces the affect if a kart loses
+           contact with the ground (i.e. it then can't steer or accelerate
+           anymore). -->
     <stability roll-influence="0.03"
                chassis-linear-damping="0.2"
-               chassis-angular-damping="0"/>
+               chassis-angular-damping="0"
+               downward-impulse-factor="0"
+               track-connection-accel="0"/>
 
     <!-- Parameters for the upright constraint, which keeps karts upright. -->
     <upright tolerance="0.2" max-force="30"/>
 
-    <!-- An artificial force that pulls a wheel to the ground if its off
-         ground. Reduces the affect if a kart loses contact with the ground
-         (i.e. it then can't steer or accelerate anymore). -->
-    <track-connection-accel value="2"/>
-
-    <!-- jump-velocity is the z-axis velocity set when a jump is initiated.
-         This will cause the kart to start rising, till it is pulled back
-         by gravity. A higher value means higher Z velocity, meaning the 
-         kart will rise faster and higher, and will be in the air longer.
-         Notice that jumps are currently disabled, so this value is ignored.  -->
-    <jump velocity="3.0"/>
-
     <!-- collision-side-impulse is an additional (artificial) impulse that
          pushes the slower kart out of the way of the faster karts (i.e. 
          sideways to the faster kart) when a collision happens. This is 
@@ -291,11 +290,13 @@
           band-speed-increase="7" band-fade-out-time="3"
           in-face-time="4 6 7"/>
 
-    <!-- Kart-specific explosion parameters. Height: how high this
-         this kart is being pushed in the sky by an explosion.
-         Time: how long it takes before the kart can drive again. 
+    <!-- Kart-specific explosion parameters. 
+         Time: how long it takes before the kart can drive again (this
+               determines how height the kart is being thrown).
          Invulnerability-time: how long a kart will be invulnerable
-         after being hit by an explosion.  -->
+               after being hit by an explosion.
+         radius: Kart closer to this value will be affected by
+               an explosion as well.  -->
     <explosion time="2" radius="5" 
          invulnerability-time="6" />