Method move

tutorials/common/tutorial/camera.h:84–90

    }

    void move (float dx, float dy, float dz)
    {
      AffineSpace3fa xfm = camera2world();
      Vec3fa ds = xfmVector(xfm,Vec3fa(dx,dy,dz));
      from += ds;
      to   += ds;
    }

    void rotate (float dtheta, float dphi)
    {