Fix getHeading() for ghost karts

src/karts/ghost_kart.cpp

@@ -112,6 +112,7 @@ void GhostKart::update(float dt)
     center_shift = getTrans().getBasis() * center_shift;
 
     Moveable::updateGraphics(dt, center_shift, btQuaternion(0, 0, 0, 1));
+    Moveable::updatePosition();
     getKartModel()->update(dt, dt*(m_all_physic_info[idx].m_speed),
         m_all_physic_info[idx].m_steer, m_all_physic_info[idx].m_speed, idx);
 

src/karts/moveable.cpp

@@ -128,7 +128,18 @@ void Moveable::update(float dt)
 {
     if(m_body->getInvMass()!=0)
         m_motion_state->getWorldTransform(m_transform);
-    m_velocityLC  = getVelocity()*m_transform.getBasis();
+    m_velocityLC = getVelocity()*m_transform.getBasis();
+    updatePosition();
+
+    updateGraphics(dt, Vec3(0,0,0), btQuaternion(0, 0, 0, 1));
+}   // update
+
+//-----------------------------------------------------------------------------
+/** Updates the current position and rotation. This function is also called
+ *  by ghost karts for getHeading() to work.
+ */
+void Moveable::updatePosition()
+{
     Vec3 forw_vec = m_transform.getBasis().getColumn(0);
     m_heading     = -atan2f(forw_vec.getZ(), forw_vec.getX());
 
@@ -138,9 +149,7 @@ void Moveable::update(float dt)
     Vec3 up       = getTrans().getBasis().getColumn(1);
     m_pitch       = atan2(up.getZ(), fabsf(up.getY()));
     m_roll        = atan2(up.getX(), up.getY());
-
-    updateGraphics(dt, Vec3(0,0,0), btQuaternion(0, 0, 0, 1));
-}   // update
+}   // updatePosition
 
 //-----------------------------------------------------------------------------
 /** Creates the bullet rigid body for this moveable.

src/karts/moveable.hpp

@@ -110,6 +110,7 @@ public:
     const btTransform
                  &getTrans() const {return m_transform;}
     void          setTrans(const btTransform& t);
+    void          updatePosition();
 }
 ;   // class Moveable