cam_pos      = [0.159969, 1.40845, 0.76068]';
cam_dir      = [0.938064, 0.0174052, -0.346025]';
cam_up       = [-0.336798, 0.280055, -0.898964]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.108075, -1.27657, -0.357201]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;