cam_pos      = [-0.347417, 1.49751, 1.37606]';
cam_dir      = [-0.838286, 0.129833, -0.529547]';
cam_up       = [0.485199, 0.620679, -0.615906]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.330788, 1.02841, 0.77579]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;