cam_pos      = [0.118902, 1.18657, 0.418074]';
cam_dir      = [-0.582511, 0.447224, -0.678728]';
cam_up       = [0.774902, 0.557628, -0.297621]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.326347, 0.930089, 0.892934]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;