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README.md

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-license: apache-2.0
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+# MeshLex-Tokens
+
+Per-mesh token sequence dataset for autoregressive 3D mesh generation.
+
+## Overview
+
+Each row contains a complete mesh encoded as a token sequence with BOS/EOS delimiters.
+Three token formats are provided for ablation comparison.
+
+**Total meshes**: 140140
+
+## Vocabulary (2372 tokens)
+
+| Token Type | ID Range | Count |
+|---|---|---|
+| PAD | 0 | 1 |
+| BOS | 1 | 1 |
+| EOS | 2 | 1 |
+| SEP | 3 | 1 |
+| Position bins | 4-259 | 256 |
+| Scale bins | 260-323 | 64 |
+| Codebook indices | 324-2371 | 2048 |
+
+## Formats
+
+- **spatial_header_c2f**: Spatial header (all positions/scales) + C2F body (codebook by level). Length: 8N+6.
+- **enhanced_flat**: Per-patch complete tokens (pos + scale + all codebook levels). Length: 8N+2.
+- **enhanced_interleaved**: Per-level sections with repeated spatial context. Length: 20N+5.
+
+## Schema
+
+| Column | Type | Description |
+|---|---|---|
+| mesh_id | string | Unique mesh identifier |
+| token_ids | list[int] | Complete token sequence |
+| seq_len | int | Sequence length |
+| n_patches | int | Number of patches in mesh |
+| tier | string | Quality tier (gold/silver) |
+
+## Source
+
+Built from [Pthahnix/MeshLex-Patches](https://huggingface.co/datasets/Pthahnix/MeshLex-Patches)
+using VQ-VAE checkpoint `pca_k2048_l4_d128` (val_recon=0.1391).
+
+## Coordinate Normalization
+
+Per-mesh center + bounding sphere scale normalization → [-1, 1]³.
+Position quantization: 256 bins. Scale quantization: 64 bins.
+Patch ordering: Morton Z-order.