cam_pos      = [-1.10229, 1.44365, 0.293972]';
cam_dir      = [0.201243, -0.173162, 0.964114]';
cam_up       = [0.171048, 0.975341, 0.139474]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.28277, -0.182, -0.300447]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;