Dalitz plot analysis of 3$\pi/K\pi\pi/K_{\rm S}^0KK$ at BaBar

We present the measurement of decay amplitudes and phases in decays of $B$ mesons to $\pi^+\pi^-\pi^+$, $K^+\pi^+\pi^-$ and $K_{\rm S}^0 K^+ K^-$ final states. We use a sample of approximately 230 million $B$-meson pairs recorded at the $\Upsilon(4S)$ resonance by the BaBar detector at the PeP-II $B$-Factory at SLAC.