Recently, radiance field rendering, such as 3D Gaussian Splatting (3DGS), has shown immense potential in VR content creation due to its high-quality rendering and efficient production process. However, existing physics-based interaction systems for 3DGS can only perform simple and non-realistic simulations or demand extensive user input for complex scenes, primarily due to the absence of scene understanding. In this paper, we propose LIVE-GS, a highly realistic interactive VR system powered by LLM. After object-aware GS reconstruction, we prompt GPT-4o to analyze the physical properties of objects in the scene, which are used to guide physical simulations consistent with real phenomena. We also design a GPT-assisted GS inpainting module to fill the unseen area covered by manipulative objects. To perform a precise segmentation of Gaussian kernels, we propose a feature-mask segmentation strategy. To enable rich interaction, we further propose a computationally efficient physical simulation framework through an PBD-based unified interpolation method, supporting various physical forms such as rigid body, soft body, and granular materials. Our experimental results show that with the help of LLM's understanding and enhancement of scenes, our VR system can support complex and realistic interactions without additional manual design and annotation.

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