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Absolute Coordinates Make Motion Generation Easy

T0 review · 4 major / 5 minor · reviewed 2026-08-07 · deepseek-v4-flash

Pith's one-line read Absolute joint coordinates in global space, trained with velocity prediction and adaptive normalization in a simple Transformer, are sufficient to beat the local-relative motion representation on text-to-motion generation.

desk verdict A well-run empirical study that makes a plausible case for absolute coordinates, but the headline claim overreaches: the decisive comparison—local-relative trained with the full recipe—is missing. read the letter →

arxiv 2505.19377 v2 pith:NNHQWLG6 submitted 2025-05-26 cs.CV

classification cs.CV
keywords text-to-motiongenerationmotionrepresentationabsolutejointcoordinatesdiffusionmodelshumansynthesiscontrolSMPL-HmeshTransformer
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

Text-to-motion generation has converged on a local-relative, kinematic-aware encoding that stores joint positions relative to the pelvis and previous frame, with extra features such as foot contacts. This paper argues that the redundancy is not just unnecessary but harmful for diffusion models, and that the long-abandoned alternative of absolute joint coordinates in global space is simpler and stronger. Using a plain Transformer with velocity prediction and adaptive layer normalization conditioning, without kinematic-aware auxiliary losses, the proposed model reaches state-of-the-art fidelity and text alignment, and its smallest variant already beats prior systems. The same formulation also makes trajectory control and spatial editing straightforward, without classifier guidance from control signals or input optimization, and extends naturally to generating SMPL-H mesh vertices directly from text. If correct, the paper shifts the field's default representation from engineered kinematic features back to raw coordinates.

What carries the argument

The workhorse is the absolute-coordinate motion representation: per frame, joint positions $X_i \in \mathbb{R}^{N_j \times 3}$ in global space, with no pelvis-relative or previous-frame encoding and no redundant kinematic features. The model tokenizes this 2D motion field with a convolutional patchifier that preserves temporal resolution, feeds the tokens into a Transformer with rotary position embeddings, QK normalization, SwiGLU, and adaptive layer normalization (AdaLN) for text and timestep conditioning, and trains with the flow-matching velocity objective $v$ instead of predicting $x_0$ or noise. An optional causal autoencoder compresses motion into a latent space that improves fidelity. For control, a ControlNet branch takes the same noised absolute inputs plus control signals and injects additive residuals into the frozen main backbone; for meshes, a fully convolutional mesh autoencoder compresses SMPL-H vertices to 28 latent channels and the same Transformer operates on those latents.

What would settle it

Train the same Transformer architecture, with the same AdaLN conditioning, velocity prediction, causal latent autoencoder, and identical model sizes, on the standard local-relative representation; evaluate both models with the original benchmark's official evaluation code. If the local-relative model matches or exceeds the absolute-coordinate model, the central claim is not supported.

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Extended reading notes

Core claim

The paper's central claim is that the dominant local-relative motion representation—which encodes intra-frame kinematics and inter-frame transitions around the pelvis and includes redundant non-animatable features—is not what makes modern text-to-motion diffusion models work. With absolute 3D joint coordinates as the only motion signal, a simple Transformer trained with the velocity-prediction objective, adaptive layer normalization conditioning, and a causal latent motion autoencoder achieves higher motion fidelity and better text alignment than existing systems, and it scales well as model size grows and token patch size shrinks. The paper further claims that this representation is the reason control and editing become straightforward: because outputs are already in global space, user-provided absolute trajectories or partial-body constraints can be injected directly through a frozen-backbone ControlNet without classifier guidance from control signals or inference-time optimization. Finally, the same model, with a mesh autoencoder for spatial compression, can generate SMPL-H mesh vertices from text directly, bypassing joint-to-mesh fitting.

Load-bearing premise

If the evaluation protocol used to compare methods is not a fair stand-in for the original benchmark, or if the comparison local-relative model is trained with a weaker recipe, the claim that absolute coordinates cause the improvement would collapse.

Editorial extensions

If this is right

  • Absolute coordinates remove the need for relative-to-absolute post-processing, so trajectory control and spatial editing can be done by directly feeding user-specified joint positions as conditions.
  • Because control signals are injected as additive residuals into a frozen backbone, generation runs without classifier guidance from control signals, reducing control inference time from roughly 81 seconds to about 2.5 seconds per sample.
  • The same framework generalizes to direct SMPL-H mesh vertex generation, so text-to-motion can skip SMPL fitting and the errors it accumulates.
  • Scaling model depth, width, and spatial patch granularity consistently improves quality, indicating that absolute coordinates give a representation that benefits from larger models.
  • The formulation also works in autoregressive diffusion variants, so the benefit is not tied to a single diffusion scheduling or backbone choice.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • Editorial inference: if absolute coordinates remain competitive under the original benchmark's evaluation pipeline, the local-relative representation's remaining justification is historical, and new text-to-motion work should default to global coordinates.
  • Editorial inference: the same recipe could transfer to other structured-sequence generation tasks whose outputs are point sets or trajectories in a fixed global frame, such as robot motion or multi-agent coordination.
  • Editorial inference: because absolute coordinates expose global position natively, physics constraints, foot-contact regularization, or scene collision terms could be added directly on generated output, which the redundant representation makes awkward.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

4 major / 5 minor

Summary. The paper proposes ACMDM, a text-to-motion diffusion framework built on absolute global joint coordinates instead of the local-relative, kinematic-aware representation popularized by HumanML3D. The authors argue that this simpler representation, combined with a DiT-style Transformer, velocity prediction, AdaLN conditioning, and an optional causal latent autoencoder, achieves state-of-the-art generation quality, naturally supports trajectory control and spatial/temporal editing, and extends directly to SMPL-H mesh vertex generation. The headline results on HumanML3D are FID 0.058 and R-Precision Top-1 0.522 for ACMDM-XL-PS2, compared with FID 0.114 and R-Precision Top-1 0.500 for MARDM-v, all measured under the evaluation framework of [66].

Significance. If the central claim is fully substantiated, this paper would challenge a widely adopted design choice in text-to-motion generation and would open a simpler path to controllable generation and direct mesh-level synthesis. The paper's strengths include a systematic ablation of conditioning mechanisms, diffusion objectives, autoencoder variants, and model scaling; a clear demonstration of controllable generation without classifier guidance; and exploratory results on direct SMPL-H mesh generation, KIT-ML, and autoregressive diffusion variants. These are useful empirical contributions. However, the manuscript currently does not directly test the representation claim against the dominant HumanML3D local-relative representation under a matched recipe, so the significance of the headline attribution remains conditional on an additional controlled experiment.

major comments (4)
  1. [§4.2, Table 1] The central claim that absolute coordinates outperform the HumanML3D local-relative representation is not directly tested. The controlled rows in Table 1 compare 'Absolute+Redundancy' (an InterGen-style absolute representation with redundant kinematic features) against plain absolute coordinates, both under concatenation conditioning. The local-relative, kinematic-aware HumanML3D encoding is never trained with the same ACMDM recipe, and the later rows that add AdaLN, latent AE, and velocity prediction are run only for the absolute representation. Because the abstract and introduction attribute the gains specifically to abandoning the HumanML3D local-relative formulation, this missing cell is load-bearing. Please add a matched experiment that trains the same ACMDM model (ideally with the full optimal recipe: AdaLN + Causal AE + velocity prediction) on the HumanML3D representation, or revise the claim to be explicitly about absolute coordinates versus absolute coordinates with redundancy.
  2. [§4.2 and Table 2] The state-of-the-art comparison confounds the representation change with changes in architecture, tokenization, latent autoencoder, conditioning mechanism, diffusion objective, and model scale. The comparison of ACMDM-XL-PS2 (FID 0.058, R-Precision Top-1 0.522) against MARDM-v (FID 0.114, R-Precision Top-1 0.500) therefore cannot establish that absolute coordinates -- rather than the overall recipe -- are responsible for the improvement. A matched comparison is needed: either apply the absolute-coordinate representation within the MARDM recipe, or train the ACMDM recipe on the HumanML3D local-relative representation. Without such an experiment, the claim that 'absolute coordinates make motion generation easy' is not causally supported.
  3. [§4.1, Evaluation Metrics] All metrics are computed under the re-evaluation framework of [66], which is the authors' own prior work, and the paper does not report results under the original HumanML3D evaluation protocol used in most published baselines. Since metric details (including the choice of motion features and how they are extracted) directly affect FID and R-Precision numbers, the lack of the original-protocol numbers makes cross-paper comparisons nonstandard and difficult for readers to relate to the existing literature. Please report results under the original HumanML3D protocol as well, or provide a clear calibration between the two protocols.
  4. [§4.4, Table 3] The controllable generation comparison also mixes multiple variables: the baseline methods use different architectures, different motion representations, and some rely on classifier guidance, while ACMDM adds a ControlNet branch to the main model. The conclusion that absolute coordinates 'naturally support' control without guidance is plausible, but the current evidence does not isolate the representation effect. Please include an ablation that uses the same ControlNet-based framework with a local-relative representation (or with the HumanML3D representation) to show that the representational change, rather than the ControlNet design, is responsible for the improved control accuracy and the elimination of classifier guidance.
minor comments (5)
  1. [Table 3 and Table A2] In the upper-body editing section, OmniControl is cited as [120] and MotionLCM V2+CtrlNet as [120], but OmniControl is [103] and MotionLCM V2 is [14]; please correct these reference labels.
  2. [§4.5, Table 4] The text states that all mesh-generation variants achieve results 'competitive with the best text-to-joint generation models,' but Table 4 contains no direct mesh-generation baselines and no joint-level baseline under the same evaluation features; please add a comparative baseline or qualify the claim.
  3. [Introduction, Contributions] The third contribution bullet contains a grammatical issue: 'promising generalizes beyond joints' should be 'promising generalization beyond joints' or 'promisingly generalizes beyond joints.'
  4. [§4.2, Table 1 caption] The table caption says 'The results indicate that kinematic-aware redundancy is not necessary,' but the table only compares absolute representations with and without redundancy; please rephrase to match the actual comparison, e.g., 'redundant kinematic features are not necessary for absolute-coordinate diffusion.'
  5. [Figure 3 caption] The caption text 'MARDMMotionLCM V2MDM' appears to be a formatting artifact from concatenated method names; please separate the method names clearly.

Circularity Check

0 steps flagged · score 1.0 of 10

No significant circularity: the representation claim rests on an in-paper controlled ablation and external HumanML3D evaluation; the self-citation to the authors' earlier framework and MARDM baseline is not load-bearing.

full rationale

The paper's contribution is empirical rather than derivational: no equation in Sections 3-4 defines the reported FID/R-Precision numbers in terms of a fitted input, and no prediction reduces by construction to a training target. The central claim that kinematic-aware redundancy is unnecessary is tested inside the paper: Table 1 fixes the architecture and conditioning and compares Absolute+Redundancy (InterGen-style) against plain Absolute coordinates, with the latter winning under velocity prediction. The broader SOTA comparison in Table 2 is computed on the external HumanML3D benchmark rather than being inherited from a citation. Reference [66] is a self-citation by the same group and supplies the evaluation harness and the MARDM baseline, but the paper re-runs those numbers and the main ablation is self-contained, so the self-citation is not load-bearing in the sense of making the result true by definition. The absence of an exact cell training HumanML3D's local-relative representation under the full ACMDM recipe (AdaLN + causal AE + v-prediction) is a real comparability limitation and belongs in correctness risk, not circularity; it does not show that ACMDM's absolute-coordinate result is equivalent to its input.

Assumptions & free parameters 6 free parameters · 5 assumptions · 0 invented entities

The central claim rests on empirical comparisons rather than theoretical derivation. The main free choices are architectural hyperparameters (patch size, CFG, latent dimensions) that were selected via ablations. The key domain assumption is that absolute coordinates are sufficient and that the evaluation metrics are valid. No new entities are introduced.

free parameters (6)
  • patch_size = 1x2 (best, smaller is better)
    Chosen by hand; decreasing patch size improves FID and R-Precision across all model sizes.
  • cfg_scale = 3.0 (text-to-motion), 2.5 (trajectory), 4.5 (mesh)
    Hand-selected per task; influences quality and control adherence.
  • latent_channel = 4
    Motion autoencoder output channel count, chosen without reported sweep.
  • temporal_downsampling_factor = 4
    Motion autoencoder downsampling factor, chosen by design.
  • sampling_steps = not reported
    Number of inference steps affects AITS and quality; not specified in the paper.
  • control_l2_loss_weight = not reported
    Weight for the ControlNet L2 loss on control signals; not specified.
assumptions (5)
  • domain assumption Absolute joint coordinates in global space fully capture human motion for generation and control.
    The paper's central premise; they argue kinematic features are unnecessary, assuming joint positions encode sufficient information for fidelity and downstream tasks.
  • domain assumption HumanML3D evaluation metrics (FID, R-Precision, Matching) are valid proxies for motion fidelity and text alignment.
    All conclusions are drawn from these metrics, which are standard but imperfect measures.
  • domain assumption CLIP-B/32 text embeddings provide sufficient semantic conditioning for text-to-motion generation.
    The model relies entirely on a frozen CLIP text encoder; this is a common but unverified assumption in the ablation.
  • standard math The v-prediction (flow-matching) diffusion objective is a valid and stable training target.
    Adopted from prior work [57]; the paper empirically finds it superior but does not derive it.
  • domain assumption The HumanML3D dataset is representative, and results transfer to KIT and mesh tasks.
    The paper evaluates on HumanML3D and KIT, but only HumanML3D is used for the main claims.

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Cite this review

Pith. "Pith review of Absolute Coordinates Make Motion Generation Easy." pith.science (2026). https://pith.science/paper/NNHQWLG6

@misc{pith2026250519377,
  author       = {Pith},
  title        = {Pith review of: Absolute Coordinates Make Motion Generation Easy},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/NNHQWLG6}},
  note         = {Machine review of arXiv:2505.19377}
}
read the original abstract

State-of-the-art text-to-motion generation models rely on the kinematic-aware, local-relative motion representation popularized by HumanML3D, which encodes motion relative to the pelvis and to the previous frame with built-in redundancy. While this design simplifies training for earlier generation models, it introduces critical limitations for diffusion models and hinders applicability to downstream tasks. In this work, we revisit the motion representation and propose a radically simplified and long-abandoned alternative for text-to-motion generation: absolute joint coordinates in global space. Through systematic analysis of design choices, we show that this formulation achieves significantly higher motion fidelity, improved text alignment, and strong scalability, even with a simple Transformer backbone and no auxiliary kinematic-aware losses. Moreover, our formulation naturally supports downstream tasks such as text-driven motion control and temporal/spatial editing without additional task-specific reengineering and costly classifier guidance generation from control signals. Finally, we demonstrate promising generalization to directly generate SMPL-H mesh vertices in motion from text, laying a strong foundation for future research and motion-related applications.

Figures

Figures reproduced from arXiv: 2505.19377 by the authors.

Figure 1
Figure 1. Absolute coordinates make motion generation easy. Here we show that our model pro￾duces motion of higher fidelity, has better controllability, and reports promising results of generating SMPL-H meshes directly. Abstract State-of-the-art text-to-motion generation models rely on the kinematic-aware, local-relative motion representation popularized by HumanML3D, which encodes motion relative to the pelvis and to the pr… view at source ↗
Figure 2
Figure 2. Overview of our proposed ACMDM. (a) Left: The raw/latent absolute coordinates representation is patchified and processed through a sequence of ACMDM blocks. Right: Details of ACMDM blocks, where we experiment with two conditioning variants: concatenation and AdaLN. (b) ControlNet-augmented ACMDM for controllable motion generation: Structured control signals are separately encoded and fused into the ACMDM generation … view at source ↗
Figure 3
Figure 3. Visual comparisons of generated motion between ACMDM and state-of-the-art methods. ACMDM generates more realistic motion that accurately follows the textual condition. within generated motions), Foot Skating Ratio, Trajectory Error, Location Error, and Average Joint Error (accuracy of controlled joints at keyframes). Metrics are averaged over five levels of control intensity (1%, 2%, 5%, 25%, 100%). During training,… view at source ↗
Figures from the paper (1 more)
Figure 4
Figure 4. Figure 4: Scaling of ACMDM with model ca￾pacity and decreasing patch size. We use red for S, orange for B, green for L, and blue for XL, with color gradients indicating decreasing patch sizes. ACMDM exhibits strong scalability, with performance consistently improving as model si…

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Pith tools

Reviewed August 7, 2026 · model on record in the stance chip above.