Made the restitution settable for karts.

git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@10409 178a84e3-b1eb-0310-8ba1-8eac791a3b58

data/stk_config.xml

@@ -280,7 +280,8 @@
     <!-- collision
          impulse: an additional impulse to be applied in a non-frontal
            collision to push two karts away from each other.
-         side-impulse is an additional (artificial) impulse that
+         resitution: restitution value to be used for the kart rigid bodies.
+         side-impulse: 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 
            for now disabled since it needs tuning and additionally has the
@@ -288,7 +289,7 @@
            the orientation - if a kart is pushed in the direction it is 
            driving, it will be more (no friction from tires), while when 
            pushed to the side, hardly anything happens.  -->
-    <collision impulse="0" side-impulse="0"/>
+    <collision impulse="0" restitution="0.5" side-impulse="0"/>
 
     <!-- Kart-specific plunger and rubber band handling: max-length is
          the maximum length of rubber band before it snaps. force is

src/items/bowling.cpp

@@ -49,6 +49,7 @@ Bowling::Bowling(Kart *kart) : Flyable(kart, PowerupManager::POWERUP_BOWLING,
 
     createPhysics(y_offset, btVector3(0.0f, 0.0f, m_speed*2),
                   new btSphereShape(0.5f*m_extend.getY()), 
+                  1.0f /*restitution*/,
                   -70.0f /*gravity*/, 
                   true /*rotates*/);
     // Even if the ball is fired backwards, m_speed must be positive,

src/items/cake.cpp

@@ -87,7 +87,8 @@ Cake::Cake (Kart *kart) : Flyable(kart, PowerupManager::POWERUP_CAKE)
         m_initial_velocity = Vec3(0.0f, up_velocity, m_speed);
 
         createPhysics(forward_offset, m_initial_velocity,
-                      new btCylinderShape(0.5f*m_extend), -m_gravity,
+                      new btCylinderShape(0.5f*m_extend), 
+                      0.5f /* restitution */, -m_gravity,
                       true /* rotation */, false /* backwards */, &trans);
     }
     else
@@ -100,7 +101,8 @@ Cake::Cake (Kart *kart) : Flyable(kart, PowerupManager::POWERUP_CAKE)
         m_initial_velocity = Vec3(0.0f, up_velocity, m_speed);
 
         createPhysics(forward_offset, m_initial_velocity,
-                      new btCylinderShape(0.5f*m_extend), -m_gravity,
+                      new btCylinderShape(0.5f*m_extend), 
+                      0.5f /* restitution */, -m_gravity,
                       true /* rotation */, backwards, &trans);
     }
 

src/items/flyable.cpp

@@ -98,7 +98,8 @@ Flyable::Flyable(Kart *kart, PowerupManager::PowerupType type, float mass)
  *         otherwise the kart's heading will be used.
  */
 void Flyable::createPhysics(float forw_offset, const Vec3 &velocity,
-                            btCollisionShape *shape, const float gravity,
+                            btCollisionShape *shape, 
+                            float restitution, const float gravity,
                             const bool rotates, const bool turn_around,
                             const btTransform* custom_direction)
 {
@@ -126,7 +127,7 @@ void Flyable::createPhysics(float forw_offset, const Vec3 &velocity,
     trans  *= offset_transform;
 
     m_shape = shape;
-    createBody(m_mass, trans, m_shape);
+    createBody(m_mass, trans, m_shape, restitution);
     m_user_pointer.set(this);
     World::getWorld()->getPhysics()->addBody(getBody());
 

src/items/flyable.hpp

@@ -153,6 +153,7 @@ protected:
     void              createPhysics(float y_offset,
                                     const Vec3 &velocity,
                                     btCollisionShape *shape, 
+                                    float restitution,
                                     const float gravity=0.0f,
                                     const bool rotates=false, 
                                     const bool turn_around=false,

src/items/plunger.cpp

@@ -76,13 +76,15 @@ Plunger::Plunger(Kart *kart) : Flyable(kart, PowerupManager::POWERUP_PLUNGER)
         m_initial_velocity = btVector3(0.0f, up_velocity, plunger_speed);
 
         createPhysics(forward_offset, m_initial_velocity,
-                      new btCylinderShape(0.5f*m_extend), gravity, 
+                      new btCylinderShape(0.5f*m_extend), 
+                      0.5f /* restitution */ , gravity, 
                       /* rotates */false , /*turn around*/false, &trans);
     }
     else
     {
         createPhysics(forward_offset, btVector3(pitch, 0.0f, plunger_speed),
-                      new btCylinderShape(0.5f*m_extend), gravity, 
+                      new btCylinderShape(0.5f*m_extend), 
+                      0.5f /* restitution */, gravity, 
                       false /* rotates */, m_reverse_mode, &kart_transform);
     }
 

src/karts/kart.cpp

@@ -261,7 +261,8 @@ void Kart::createPhysics()
     // --------------------
     btTransform trans;
     trans.setIdentity();
-    createBody(mass, trans, &m_kart_chassis);
+    createBody(mass, trans, &m_kart_chassis, 
+               m_kart_properties->getRestitution());
     m_user_pointer.set(this);
     m_body->setDamping(m_kart_properties->getChassisLinearDamping(),
                        m_kart_properties->getChassisAngularDamping() );

src/karts/kart_properties.cpp

@@ -73,7 +73,7 @@ KartProperties::KartProperties(const std::string &filename)
         m_chassis_angular_damping = m_suspension_rest =
         m_max_speed_reverse_ratio = 
         m_rescue_vert_offset = m_upright_tolerance = 
-        m_collision_side_impulse = m_collision_impulse =
+        m_collision_side_impulse = m_collision_impulse = m_restitution =
         m_upright_max_force = m_suspension_travel_cm =
         m_track_connection_accel =
         m_rubber_band_max_length = m_rubber_band_force =
@@ -429,6 +429,7 @@ void KartProperties::getAllData(const XMLNode * root)
     {
         collision_node->get("impulse",       &m_collision_impulse     );
         collision_node->get("side-impulse",  &m_collision_side_impulse);
+        collision_node->get("restitution",   &m_restitution           );
     }
 
     //TODO: wheel front right and wheel front left is not loaded, yet is listed as an attribute in the xml file after wheel-radius
@@ -594,6 +595,7 @@ void KartProperties::checkAllSet(const std::string &filename)
     CHECK_NEG(m_suspension_travel_cm,       "suspension travel-cm"          );
     CHECK_NEG(m_max_suspension_force,       "suspension max-force"          );
     CHECK_NEG(m_collision_impulse,          "collision impulse"             );
+    CHECK_NEG(m_restitution,                "collision restitution"         );
     CHECK_NEG(m_collision_side_impulse,     "collision side-impulse"        );
     CHECK_NEG(m_upright_tolerance,          "upright tolerance"             );
     CHECK_NEG(m_upright_max_force,          "upright max-force"             );

src/karts/kart_properties.hpp

@@ -257,6 +257,9 @@ private:
      *  side-side collision away from each other. */
     float m_collision_impulse;
 
+    /** The restitution factor to be used in collsions for this kart. */
+    float m_restitution;
+
     float m_upright_tolerance;
     float m_upright_max_force;
 
@@ -508,6 +511,9 @@ public:
      *  to another kart in case of a non-frontal collision. */
     float getCollisionImpulse       () const {return m_collision_impulse;}
 
+    /** Returns the restitution factor for this kart. */
+    float getRestitution            () const { return m_restitution; }
+
     /** Returns the vertical offset when rescuing karts to avoid karts being
      *  rescued in (or under) the track. */
     float getVertRescueOffset       () const {return m_rescue_vert_offset;    }

src/karts/moveable.cpp

@@ -141,7 +141,9 @@ void Moveable::update(float dt)
  *  \param shape Bullet collision shape for this object.
  */
 void Moveable::createBody(float mass, btTransform& trans,
-                          btCollisionShape *shape) {
+                          btCollisionShape *shape,
+                          float restitution) 
+{
     btVector3 inertia;
     shape->calculateLocalInertia(mass, inertia);
     m_transform = trans;
@@ -149,7 +151,7 @@ void Moveable::createBody(float mass, btTransform& trans,
 
     btRigidBody::btRigidBodyConstructionInfo info(mass, m_motion_state, 
                                                   shape, inertia);
-    info.m_restitution=0.5f;
+    info.m_restitution = restitution;
 
     // Then create a rigid body
     // ------------------------

src/karts/moveable.hpp

@@ -105,7 +105,8 @@ public:
     virtual void  update(float dt) ;
     btRigidBody  *getBody() const {return m_body; }
     void          createBody(float mass, btTransform& trans, 
-                             btCollisionShape *shape);
+                             btCollisionShape *shape,
+                             float restitution);
     const btTransform 
                  &getTrans() const {return m_transform;}
     void          setTrans(const btTransform& t);