cam_pos      = [-1.1612, 1.54945, 0.9828]';
cam_dir      = [0.80466, 0.128976, 0.579558]';
cam_up       = [0.0709616, 0.948233, -0.309545]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.784008, -0.385973, -1.00262]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;