This AI Research from Stability AI and Tripo AI Introduces TripoSR Model for Fast FeedForward 3D Generation from a Single Image

In the realm of 3D generative AI, the boundaries between 3D generation and 3D reconstruction from a small number of views have started to blur. This convergence is propelled by a series of breakthroughs, including the emergence of large-scale public 3D datasets and advancements in generative model topologies

There has been new research into using 2D diffusion models to generate 3D objects from input photos or text prompts to circumvent the lack of 3D training data. One example is DreamFusion, which pioneered score distillation sampling (SDS) by optimizing 3D models using a 2D diffusion model. To generate detailed 3D objects, this method is a game-changer since it uses 2D priors for 3D production. However, because of the high computational and optimization requirements and the difficulty in accurately managing the output models, these methods usually encounter limits with slow generation speed. Feedforward 3D reconstruction models are far more efficient in terms of computing power. Several newer methods in this vein have demonstrated the potential for scalable training on varied 3D datasets. These new methods significantly improve the efficiency and practicality of 3D models by allowing for quick feedforward inference and, maybe, by giving better control over the produced outputs.

A new study by Stability AI and Tripo AI presents the TripoSR model, which can generate 3D feedforward models from a single image in under half a second using an A100 GPU. The team provides various enhancements to data curation and rendering, model design, and training methodologies, all while expanding upon the LRM architecture. For 3D reconstruction from a single image, TripoSR uses the transformer architecture, much like LRM. It takes an object in a single RGB photograph and produces a three-dimensional model. 

The TripoSR model comprises three main parts:

• An image encoder
• A neural radiance field (NeRF) based on triplanes
• An image-to-triplane decoder

The image encoder is initialized using a pre-trained vision transformer model called DINOv1. This model plays a crucial role in the TripoSR model. It converts an RGB image into a series of latent vectors, which encode the global and local picture properties necessary for reconstructing the 3D object.

The proposed approach avoids explicit parameter conditioning to build a more durable and flexible model that can handle various real-world circumstances without relying on accurate camera data. Important design factors include transformer layer count, triplane size, NeRF model details, and primary training settings.

Two enhancements to the training data collecting have been implemented in response to the paramount significance of data: 

• Data curation: Data curation, which involved picking a subset of the Objaverse dataset distributed under the CC-BY license, improved the quality of training data.
• Data Rendering: They have implemented various data rendering strategies to improve the model’s generalizability, even when trained solely with the Objaverse dataset. These techniques better mimic the distribution of real-world photos.

The experiments have demonstrated that the TripoSR model outperforms competing open-source solutions numerically and qualitatively. This, along with the availability of the pretrained model, an online interactive demo, and the source code under the MIT license, presents a significant advancement in the fields of artificial intelligence (AI), computer vision (CV), and computer graphics (CG). The team anticipates a transformative impact on these fields by equipping researchers, developers, and artists with these cutting-edge tools for 3D generative AI. 

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