initially project karts onto track from slightly higher

git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/branches/irrlicht@3886 178a84e3-b1eb-0310-8ba1-8eac791a3b58

src/modes/world.cpp

@@ -248,6 +248,10 @@ void World::resetAllKarts()
     //that at least one of its wheel will be on the surface of the track
     for ( Karts::iterator i=m_kart.begin(); i!=m_kart.end(); i++)
     {
+        ///start projection from top of kart
+        btVector3 up_offset(0, 0, 0.5f * ((*i)->getKartHeight()));
+        (*i)->getVehicle()->getRigidBody()->translate (up_offset);
+
         bool kart_over_ground = m_physics->projectKartDownwards(*i);
 
         if (!kart_over_ground)