cam_pos      = [-0.272886, 0.549029, 1.44661]';
cam_dir      = [0.880245, 0.464294, -0.0979795]';
cam_up       = [-0.39671, 0.833342, 0.38492]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.346288, 0.398939, -1.22059]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;