{
// If we are facing into the surface jump up, otherwise
// jump away from surface.
F32 dot = mDot(pv,mJumpSurfaceNormal);
if (dot <= 0){
   acc.y += impulse * zSpeedScale;
   //the "y" in acc controls the direction, in this case, forward. -Mack
   acc.z += 7 * zSpeedScale;
   //the "z" in acc causes the player to jump up, "7" is a set variable of "impulse" which controls the height -Mack.
}
}