Dynamic Point Fields
This work addresses the challenge of creating expressive animatable human avatars with complex cloth appearances, which is important for applications in computer graphics and virtual reality, though it is incremental as it builds on existing point-based and neural surface reconstruction techniques.
The paper tackles the problem of modeling dynamic 3D surfaces, such as human avatars, by introducing a dynamic point field model that combines explicit point-based graphics with implicit deformation networks, resulting in improved representational power, learning efficiency, and robustness to novel poses compared to previous methods like linear blend skinning.
Recent years have witnessed significant progress in the field of neural surface reconstruction. While the extensive focus was put on volumetric and implicit approaches, a number of works have shown that explicit graphics primitives such as point clouds can significantly reduce computational complexity, without sacrificing the reconstructed surface quality. However, less emphasis has been put on modeling dynamic surfaces with point primitives. In this work, we present a dynamic point field model that combines the representational benefits of explicit point-based graphics with implicit deformation networks to allow efficient modeling of non-rigid 3D surfaces. Using explicit surface primitives also allows us to easily incorporate well-established constraints such as-isometric-as-possible regularisation. While learning this deformation model is prone to local optima when trained in a fully unsupervised manner, we propose to additionally leverage semantic information such as keypoint dynamics to guide the deformation learning. We demonstrate our model with an example application of creating an expressive animatable human avatar from a collection of 3D scans. Here, previous methods mostly rely on variants of the linear blend skinning paradigm, which fundamentally limits the expressivity of such models when dealing with complex cloth appearances such as long skirts. We show the advantages of our dynamic point field framework in terms of its representational power, learning efficiency, and robustness to out-of-distribution novel poses.