Versuch mal das da:

while (1)
{
ball_force.y = 350 * time_step * ((key_cuu || key_w) - (key_cud || key_s));
if (key_cud || key_s)
{
camera.x=ball.x+300;
camera.pan=180;
ball_force.x = 350 * time_step * ((key_cul || key_a)-(key_cur || key_d);
}
else
{camera.pan=0;
camera.x = ball.x-300;

ball_force.x = 350 * time_step * ((key_cur || key_d) - (key_cul || key_a));
}
ball_force.z = 0;
phent_addtorqueglobal (ball, ball_force);
camera.y = ball.y;
camera.z = ball.z + 200;
camera.tilt = -25;

wait (1);
}