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tis-sft-blender — Blender-Cycles re-render of the TIS trajectory-SFT data

Multi-turn multimodal SFT parquets (verl MultiTurnSFTDataset shape) where every frame was re-rendered with Blender Cycles GPU (OptiX, 32 spp, denoised, 640x480) at the exact camera pose of the original Open3D-raycast trajectory: vertex-colour Principled BSDF, ambient 1.15 + camera-point headlamp. Teacher text, poses, and action grammar are unchanged from the raycast version — only the pixels differ (lit, shadowed, AO).

set train / val scenes convention source bank
multi3d_blender 5,725 / 301 885 (ScanNet+ARKit+MP3D) discrete (v9 move) multi-domain 6k bank, per-scene cap 10
action_blender 5,451 / 286 565 (ScanNet) discrete gemini_action_8k good rows (--select all; explored=799)
zeroshot_blender 1,970 / 103 402 (ScanNet) discrete zeroshot 2,073 bank (--select all; 93% 2-view)

Assistant turns are truncated at </tool_call>/</answer> (70 teacher turns had hallucinated tool responses after the closing tag; training on them teaches fabricating observations).

Files are sharded ~900MB with row_group_size=64: a single-row-group nested-image parquet past ~2GB is unreadable (ArrowNotImplementedError) — read with row groups or iter_batches.

Gated: derived from ScanNet / ARKitScenes / Matterport3D; agree to the source datasets' terms.

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