cam_pos      = [-0.107043, 1.25551, 1.33199]';
cam_dir      = [0.658438, -0.0635338, -0.749948]';
cam_up       = [-0.402697, 0.812066, -0.422355]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.84567, -0.771528, -0.677118]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;