OccDirector: Language-Guided Behavior and Interaction Generation in 4D Occupancy Space

• URL: http://arxiv.org/abs/2604.22240v1
• Date: Fri, 24 Apr 2026 05:30:35 GMT
• Title: OccDirector: Language-Guided Behavior and Interaction Generation in 4D Occupancy Space
• Abstract summary: OccDirector generates 4D occupancy dynamics conditioned solely on natural language.<n>OccDirector achieves state-of-the-art generation quality and unprecedented instruction-following capabilities.
• Score: 66.35177674346156
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Generative world models increasingly rely on 4D occupancy for realistic autonomous driving simulation. However, existing generation frameworks depend on rigid geometric conditions (e.g., explicit trajectories) or simplistic attribute-level text, failing to orchestrate complex, sequential multi-agent interactions. To address this semantic-spatiotemporal gap, we propose OccDirector, a pioneering framework that generates 4D occupancy dynamics conditioned solely on natural language. Operating as a ``scenario director'', OccDirector maps natural language scripts into physically plausible voxel dynamics without requiring geometric priors. Technically, it employs a VLM-driven Spatio-Temporal MMDiT equipped with a history-prefix anchoring strategy to ensure long-horizon interaction consistency. Furthermore, we introduce OccInteract-85k, a novel dataset uniquely annotated with multi-level language instructions: ranging from static layouts to intricate multi-agent behaviors, alongside a novel VLM-based evaluation benchmark. Extensive experiments demonstrate that OccDirector achieves state-of-the-art generation quality and unprecedented instruction-following capabilities, successfully shifting the paradigm from appearance synthesis to language-driven behavior orchestration.

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