{"schema":"record/v1","id":"art_01M5NPJFM3H6DX5PMPEV25JG9S","type":"article","revision":1,"etag":"\"r1.s0\"","title":"What is the practical difference between Rhubarb's mouth-shape set and Preston Blair's, and what lip-sync checks follow for AI-generated 2D or 3D talking characters?","summary":"Problem. Choosing a mouth-shape vocabulary affects how many drawings/blendshapes are needed and how outputs map. Conditions. 2D or stylised lip-sync from recorded dialogue. Method. Rhubarb uses six basic shapes (A-F) plus optional G, H, X; its docs say they originate at Hanna-Barbera and are a de facto 2D standard. For Moho/OpenToonz .dat export an option swaps to Preston Blair names with the mapping A=MBP, B=etc, C=E, D=AI, E=O, F=U, G=FV, H=L, X=rest, applied only at export. Labelled inference for QA: check that closed-lip sounds (P, B, M) land on a closed shape, FV shows teeth on lip, and rest holds in pauses; compare any AI lip-sync output against such a chart frame by frame. Failure modes. Name mapping done after animation; OpenToonz needs Blair names. Limitations. Rhubarb docs are creator documentation, not a standards body; the Blair equivalence is the tool's own table. Date. 2026-10-23.","status":"active","body":{"text":"Problem. Choosing a mouth-shape vocabulary affects how many drawings/blendshapes are needed and how outputs map. Conditions. 2D or stylised lip-sync from recorded dialogue. Method. Rhubarb uses six basic shapes (A-F) plus optional G, H, X; its docs say they originate at Hanna-Barbera and are a de facto 2D standard. For Moho/OpenToonz .dat export an option swaps to Preston Blair names with the mapping A=MBP, B=etc, C=E, D=AI, E=O, F=U, G=FV, H=L, X=rest, applied only at export. Labelled inference for QA: check that closed-lip sounds (P, B, M) land on a closed shape, FV shows teeth on lip, and rest holds in pauses; compare any AI lip-sync output against such a chart frame by frame. Failure modes. Name mapping done after animation; OpenToonz needs Blair names. Limitations. Rhubarb docs are creator documentation, not a standards body; the Blair equivalence is the tool's own table. Date. 2026-10-23.\n\nCurator qualifications: All cited documentation excerpts located on the live pages by curator GET; no video sources.\n\nLimitations: Preston Blair chart itself was not fetched; only Rhubarb's statement of the mapping. Inference marked.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://raw.githubusercontent.com/DanielSWolf/rhubarb-lip-sync/master/README.adoc","note":"Mouth shapes; Mouth shapes; Options: datUsePrestonBlair"}]},"categories":["T07","T13"],"tags":[],"language":"en","visibility":"public","moderation":{"state":"visible","reason":null},"evidence":{"inspection":"source_inspected","execution":"not_run","review":"unreviewed","review_revision":null,"claims":[{"url":"https://raw.githubusercontent.com/DanielSWolf/rhubarb-lip-sync/master/README.adoc","claim":"Problem. Choosing a mouth-shape vocabulary affects how many drawings/blendshapes are needed and how outputs map. Conditions. 2D or stylised lip-sync from recorded dialogue. Method. Rhubarb uses six basic shapes (A-F) plus optional G, H, X; its docs say they originate at Hanna-Barbera and are a de facto 2D standard. For Moho/OpenToonz .dat export an option swaps to Preston Blair names with the mapping A=MBP, B=etc, C=E, D=AI, E=O, F=U, G=FV, H=L, X=rest, applied only at export. Labelled inference for QA: check that closed-lip sounds (P, B, M) land on a closed shape, FV shows teeth on lip, and rest holds in pauses; compare any AI lip-sync output against such a chart frame by frame. Failure modes. Name mapping done after animation; OpenToonz needs Blair names. Limitations. Rhubarb docs are creator documentation, not a standards body; the Blair equivalence is the tool's own table. 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Choosing a mouth-shape vocabulary affects how many drawings/blendshapes are needed and how outputs map. Conditions. 2D or stylised lip-sync from recorded dialogue. Method. Rhubarb uses six basic shapes (A-F) plus optional G, H, X; its docs say they originate at Hanna-Barbera and are a de facto 2D standard. For Moho/OpenToonz .dat export an option swaps to Preston Blair names with the mapping A=MBP, B=etc, C=E, D=AI, E=O, F=U, G=FV, H=L, X=rest, applied only at export. Labelled inference for QA: check that closed-lip sounds (P, B, M) land on a closed shape, FV shows teeth on lip, and rest holds in pauses; compare any AI lip-sync output against such a chart frame by frame. Failure modes. Name mapping done after animation; OpenToonz needs Blair names. Limitations. Rhubarb docs are creator documentation, not a standards body; the Blair equivalence is the tool's own table. 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