  3D content creation via text-driven stylization has played a fundamental
challenge to multimedia and graphics community. Recent advances of cross-modal
foundation models (e.g., CLIP) have made this problem feasible. Those
approaches commonly leverage CLIP to align the holistic semantics of stylized
mesh with the given text prompt. Nevertheless, it is not trivial to enable more
controllable stylization of fine-grained details in 3D meshes solely based on
such semantic-level cross-modal supervision. In this work, we propose a new
3DStyle-Diffusion model that triggers fine-grained stylization of 3D meshes
with additional controllable appearance and geometric guidance from 2D
Diffusion models. Technically, 3DStyle-Diffusion first parameterizes the
texture of 3D mesh into reflectance properties and scene lighting using
implicit MLP networks. Meanwhile, an accurate depth map of each sampled view is
achieved conditioned on 3D mesh. Then, 3DStyle-Diffusion leverages a
pre-trained controllable 2D Diffusion model to guide the learning of rendered
images, encouraging the synthesized image of each view semantically aligned
with text prompt and geometrically consistent with depth map. This way
elegantly integrates both image rendering via implicit MLP networks and
diffusion process of image synthesis in an end-to-end fashion, enabling a
high-quality fine-grained stylization of 3D meshes. We also build a new dataset
derived from Objaverse and the evaluation protocol for this task. Through both
qualitative and quantitative experiments, we validate the capability of our
3DStyle-Diffusion. Source code and data are available at
\url{https://github.com/yanghb22-fdu/3DStyle-Diffusion-Official}.
