MoGeFlow: Flowing Through Motion Codebook Geometry for Text-to-Motion Generation

Vector-quantized tokenizers have become the dominant interface for text-to- motion generation, and the priors built on them treat motion codes as unordered categorical labels. We show that this discards structure the tokenizer already learned. A motion code embedding is a decoder-bound movement prototype, and learned motion codebooks carry measurable, decoder-causal geometry: code distances track the distances between the movements those codes decode to, the alignment collapses under shuffled controls, and displacement in code space pre- dicts how far the frozen decoder moves. Geometry of this kind calls for a dif- ferent generative object—a continuous trajectory through the code space rather than a sequence of decisions over a vocabulary. We introduce MoGeFlow, a text- conditioned flow over part-structured motion-code frames. Its tokenizer quantizes each body-part group separately, so every decoder input is a point on a combina- torial lattice of decoder-bound states, and the flow regresses onto that lattice. Be- cause the decoder responds smoothly to code-space displacement, generated states are decoded as they are, and the detail the flow places between codes reaches the decoder instead of being rounded away. Quantization therefore serves generation entirely at training time, shaping the space rather than gating the samples: under matched conditions the lattice-shaped target beats both the unquantized latents it is built from and a matched variational latent space. MoGeFlow sets a new state of the art in text–motion alignment on HumanML3D, leads Top-3 retrieval and Mul- tiModal Distance on KIT-ML, and on the large-scale MotionMillion benchmark surpasses a 7B-parameter model in retrieval with an order of magnitude fewer parameters. Quantization shapes the space; the flow generates through it.