cam_pos      = [0.694636, 1.64202, 0.324256]';
cam_dir      = [-0.650441, -0.490443, -0.579993]';
cam_up       = [-0.159322, 0.834702, -0.527151]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.987736, 0.333132, 0.826014]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;