cam_pos      = [-0.724664, 1.34564, 0.11048]';
cam_dir      = [0.444312, 0.129667, 0.886438]';
cam_up       = [0.549956, 0.74161, -0.384138]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.940579, -0.875379, -0.343399]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;