cam_pos      = [0.344251, 1.37034, 0.345757]';
cam_dir      = [-0.582511, 0.447225, -0.678728]';
cam_up       = [0.712566, 0.682718, -0.161699]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.520115, 0.768513, 0.952768]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;