Models could write 3D code but not change it: a 2,592-task benchmark put average instruction-editing success at 37%
AspireAI community · arXiv (3DCodeEdit)
3DCodeEdit benchmarks instruction-guided editing of Blender programs that construct objects entirely in code, spanning 2,592 editing tasks over 108 programs and judged from renders against human-reviewed checklists. Across 17 models the average success rate is 37%, and even the strongest models complete fewer than 60% of structural and style edits, with failures shifting from syntax toward geometric foresight as models improve. Feedback from a separate reviewer model that describes how the render differs from the request helps more than extra reasoning effort or an agent harness, and can let a 27B model surpass the single-shot rate of a 2.8T-parameter model.
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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.