Instant3D: Instant Text-to-3D Generation
Authors: name: Ming Li, name: Pan Zhou, name: Jia-Wei Liu, name: Jussi Keppo, name: Min Lin, name: Shuicheng Yan, name: Xiangyu Xu

Text-to-3D generation, which aims to synthesize vivid 3D objects from text
prompts, has attracted much attention from the computer vision community. While
several existing works have achieved impressive results for this task, they
mainly rely on a time-consuming optimization paradigm. Specifically, these
methods optimize a neural field from scratch for each text prompt, taking
approximately one hour or more to generate one object. This heavy and
repetitive training cost impedes their practical deployment. In this paper, we
propose a novel framework for fast text-to-3D generation, dubbed Instant3D.
Once trained, Instant3D is able to create a 3D object for an unseen text prompt
in less than one second with a single run of a feedforward network. We achieve
this remarkable speed by devising a new network that directly constructs a 3D
triplane from a text prompt. The core innovation of our Instant3D lies in our
exploration of strategies to effectively inject text conditions into the
network. Furthermore, we propose a simple yet effective activation function,
the scaled-sigmoid, to replace the original sigmoid function, which speeds up
the training convergence by more than ten times. Finally, to address the Janus
(multi-head) problem in 3D generation, we propose an adaptive Perp-Neg
algorithm that can dynamically adjust its concept negation scales according to
the severity of the Janus problem during training, effectively reducing the
multi-head effect. Extensive experiments on a wide variety of benchmark
datasets demonstrate that the proposed algorithm performs favorably against the
state-of-the-art methods both qualitatively and quantitatively, while achieving
significantly better efficiency. The project page is at
https://ming1993li.github.io/Instant3DProj.