cam_pos      = [0.0771046, 1.64533, 0.827914]';
cam_dir      = [-0.941769, -0.0423816, 0.33358]';
cam_up       = [-0.293537, 0.587546, -0.754072]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.218167, 1.07475, 0.752478]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;