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SpatialBrain Released: Preserving Spatial Reasoning Experience on a Fixed Backbone

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SpatialBrain released a spatial reasoning framework that preserves spatial reasoning decision experience while keeping the vision-language backbone fixed; the paper states that on five spatial reasoning benchmarks, it improves over direct answering with the same backbone on four and ties on one. The framework consists of three parts: 3DFusionMemory fuses current scene observations into queryable spatial relations, the Spatial Skill Library provides reusable tool workflows, and Spatial Cognition associates task conditions with experience on when and how to use memory and skills. Completed trajectories are abstracted into process records and consolidated between task blocks, so that subsequent decisions can draw on prior executions without passing scene coordinates or reference answers.