cam_pos      = [0.0501111, 1.633, 0.81347]';
cam_dir      = [-0.990104, -0.0477088, -0.131974]';
cam_up       = [0.0952155, 0.462461, -0.881512]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.137108, 1.17752, 0.602945]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;