ISS: Image as Stepping Stone for Text-Guided 3D Shape Generation
This work addresses the problem of generating 3D shapes from text for applications in computer graphics and AI, offering a general solution without paired data, though it builds incrementally on existing methods like CLIP and single-view reconstruction.
The paper tackles the challenge of text-guided 3D shape generation by introducing a two-stage framework that uses 2D images as an intermediate step to bridge the semantic gap between text and 3D shapes, eliminating the need for paired text-shape data. It outperforms state-of-the-art methods in fidelity and consistency with text, as demonstrated in experiments.
Text-guided 3D shape generation remains challenging due to the absence of large paired text-shape data, the substantial semantic gap between these two modalities, and the structural complexity of 3D shapes. This paper presents a new framework called Image as Stepping Stone (ISS) for the task by introducing 2D image as a stepping stone to connect the two modalities and to eliminate the need for paired text-shape data. Our key contribution is a two-stage feature-space-alignment approach that maps CLIP features to shapes by harnessing a pre-trained single-view reconstruction (SVR) model with multi-view supervisions: first map the CLIP image feature to the detail-rich shape space in the SVR model, then map the CLIP text feature to the shape space and optimize the mapping by encouraging CLIP consistency between the input text and the rendered images. Further, we formulate a text-guided shape stylization module to dress up the output shapes with novel textures. Beyond existing works on 3D shape generation from text, our new approach is general for creating shapes in a broad range of categories, without requiring paired text-shape data. Experimental results manifest that our approach outperforms the state-of-the-arts and our baselines in terms of fidelity and consistency with text. Further, our approach can stylize the generated shapes with both realistic and fantasy structures and textures.