Wow, I perform an lookat action, I get the SimpleVector from a curve , and get this SimpleVector matrix , then set the car by this matrix ,
SimpleVector posAhead = way.PointOnPath(xp);
SimpleVector poscur = getTransformedCenter();
posAhead.sub(poscur);
rotMatrix=posAhead.getRotationMatrix();
//here must set X angle to 0
? setXangle = 0
//
setRotationMatrix(rotMatrix);