NVFi tackles the intricate challenge of comprehending and predicting the dynamics inside 3D scenes evolving over time, a task critical for applications in augmented reality, gaming, and cinematography. While humans effortlessly grasp the physics and geometry of such scenes, existing computational models struggle to explicitly learn these properties from multi-view videos. The core issue lies in the lack of prevailing methods, including neural radiance fields and their derivatives, to extract and predict future motions based on learned physical rules. NVFi ambitiously goals to bridge this gap by incorporating disentangled velocity fields derived purely from multi-view video frames, a feat yet unexplored in prior frameworks.

The dynamic nature of 3D scenes poses a profound computational challenge. While recent advancements in neural radiance fields showcased exceptional abilities in interpolating views inside observed time frames, they fall short in learning explicit physical characteristics comparable to object velocities. This limitation impedes their capability to foresee future motion patterns accurately. Current studies integrating physics into neural representations exhibit promise in reconstructing scene geometry, appearance, velocity, and viscosity fields. Nevertheless, these learned physical properties are sometimes intertwined with specific scene elements or necessitate supplementary foreground segmentation masks, limiting their transferability across scenes. NVFi’s pioneering ambition is to disentangle and comprehend the rate fields inside entire 3D scenes, fostering predictive capabilities extending beyond training observations.

Researchers from The Hong Kong Polytechnic University introduce a comprehensive framework NVFi encompassing three fundamental components. First, a keyframe dynamic radiance field facilitates the training of time-dependent volume density and appearance for each point in 3D space. Second, an interframe velocity field captures time-dependent 3D velocities for every point. Finally, a joint optimization strategy involving each keyframe and interframe elements, augmented by physics-informed constraints, orchestrates the training process. This framework offers flexibility in adopting existing time-dependent NeRF architectures for dynamic radiance field modeling while employing relatively easy neural networks, comparable to MLPs, for the rate field. The core innovation lies within the third component, where the joint optimization strategy and specific loss functions enable precise learning of disentangled velocity fields without additional object-specific information or masks.

NVFi’s modern stride is obvious in its ability to model the dynamics of 3D scenes purely from multi-view video frames, eliminating the necessity for object-specific data or masks. It meticulously focuses on disentangling velocity fields, a critical aspect governing scene movement dynamics, which holds the important thing to quite a few applications. Across multiple datasets, NVFi showcases its proficiency in extrapolating future frames, segmenting scenes semantically, and transferring velocities between disparate scenes. These experimental validations substantiate NVFi’s adaptability and superior performance in varied real-world scenarios.

Key Contributions and Takeaway:

• Introduction of NVFi, a novel framework for dynamic 3D scene modeling from multi-view videos without prior object information.
• Design and implementation of a neural velocity field alongside a joint optimization strategy for effective network training.
• Successful demonstration of NVFi’s capabilities across diverse datasets, showcasing superior performance in future frame prediction, semantic scene decomposition, and inter-scene velocity transfer.

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