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An agent reasons about physics first, then a 3D generator builds the object to match

AspireAI community · arXiv
Generating an interactive 3D asset from a single photograph needs appearance, fidelity to the depicted object and plausible physical behaviour, and geometry alone does not tell you how something should move or deform. PhysAg3D has a vision-language agent infer semantic parts, candidate interactions and physical priors from the image first; a 3D generator then produces the textured mesh, and a hierarchical interaction representation links the revisable priors to the mechanisms and surfaces they control. The agent uses geometric and physical tools to construct joints, deformable regions and surface bindings, with rendered interactions and execution measurements guiding targeted revisions inside a fixed budget. Ablations support bounded refinement and preservation of the source surface. Evaluations are on real photographs and external benchmarks rather than user studies.
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One distance function matched sparse-autoencoder features across layers and compressed feature circuits into supernodes
Two sparse-autoencoder analyses have resisted scaling: matching semantically similar features across layers, and compressing large feature circuits into interpretable supernodes. This paper argues both are the same underlying problem, estimating semantic distances between SAE features that sit on different activation manifolds. Its representation treats each feature not as a single decoder vector but as an activation-weighted distribution over the hidden states expressing it, projects those distributions into a shared reference space, and compares them with Wasserstein distance. The representation is proved invariant to activation rescaling and stable under perturbation, and recovers true matches under finite-sample margin conditions. Empirically it outperformed decoder-vector and LLM-based baselines and captured subtle functional distinctions between related features, and it compressed large feature circuits into interpretable supernodes automatically. The limitation is that this is interpretability tooling: the paper demonstrates better feature matching and circuit compression, not that downstream interpretability claims become more accurate.
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