cam_pos      = [0.218967, 1.05951, 0.617605]';
cam_dir      = [0.568983, 0.411289, -0.71211]';
cam_up       = [-0.802374, 0.46736, -0.371174]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.239601, -1.04082, -0.792584]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;