cam_pos      = [-0.722355, 1.58848, 0.28488]';
cam_dir      = [0.96093, -0.119246, 0.249786]';
cam_up       = [0.0690623, 0.977191, 0.200821]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.356488, 0.233713, -1.25984]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;