Boosting MLLM Spatial Reasoning with Geometrically Referenced 3D Scene Representations
While Multimodal Large Language Models (MLLMs) have achieved remarkable success in 2D visual understanding, their ability to reason about 3D space remains limited. To address this gap, we introduce geometrically referenced 3D scene representations (GR3D). Given a set of input images, GR3D annotates objects in the images with unique IDs and encodes their 3D geometric attributes as textual references indexed by these IDs. This representation enables MLLMs to interpret 3D cues using their advanced language-based skills in mathematical reasoning, while concurrently analyzing 2D visual features in a tightly coupled way. We present a simple yet effective approach based on GR3D, which requires n...
| Authors | Jiangye Yuan, Gowri Kumar, Baoyuan Wang |
|---|---|
| Primary category | cs.CV |
| Published | 9 March 2026 |
| Last updated at source | 26 April 2026 |
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