GIFS: Neural Implicit Function for General Shape Representation

TL;DR

GIFS introduces a novel neural implicit function that models relationships between point pairs, enabling the representation of complex, non-watertight, and multi-layered 3D shapes more effectively than previous methods.

Contribution

The paper proposes GIFS, a new implicit shape representation that captures point relationships rather than surface boundaries, allowing for general shape modeling beyond watertight objects.

Findings

GIFS outperforms state-of-the-art methods in shape reconstruction quality.

GIFS improves rendering efficiency and visual fidelity.

GIFS effectively models non-watertight and multi-layered shapes.

Abstract

Recent development of neural implicit function has shown tremendous success on high-quality 3D shape reconstruction. However, most works divide the space into inside and outside of the shape, which limits their representing power to single-layer and watertight shapes. This limitation leads to tedious data processing (converting non-watertight raw data to watertight) as well as the incapability of representing general object shapes in the real world. In this work, we propose a novel method to represent general shapes including non-watertight shapes and shapes with multi-layer surfaces. We introduce General Implicit Function for 3D Shape (GIFS), which models the relationships between every two points instead of the relationships between points and surfaces. Instead of dividing 3D space into predefined inside-outside regions, GIFS encodes whether two points are separated by any surface. Experiments on ShapeNet show that GIFS outperforms previous state-of-the-art methods in terms of reconstruction quality, rendering efficiency, and visual fidelity. Project page is available at https://jianglongye.com/gifs .