cam_pos      = [-0.466249, 1.33521, 0.393478]';
cam_dir      = [-0.681014, 0.142989, -0.718175]';
cam_up       = [0.723409, 0.283488, -0.629535]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.151057, 1.26118, 0.394344]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;