cam_pos      = [-1.19321, 1.60973, -0.112137]';
cam_dir      = [0.083428, -0.404893, 0.91055]';
cam_up       = [0.110722, 0.911844, 0.395323]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.31716, -0.0902231, -0.160802]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;