  We introduce a deep generative network for 3D shape detailization, akin to
stylization with the style being geometric details. We address the challenge of
creating large varieties of high-resolution and detailed 3D geometry from a
small set of exemplars by treating the problem as that of geometric detail
transfer. Given a low-resolution coarse voxel shape, our network refines it,
via voxel upsampling, into a higher-resolution shape enriched with geometric
details. The output shape preserves the overall structure (or content) of the
input, while its detail generation is conditioned on an input "style code"
corresponding to a detailed exemplar. Our 3D detailization via conditional
refinement is realized by a generative adversarial network, coined DECOR-GAN.
The network utilizes a 3D CNN generator for upsampling coarse voxels and a 3D
PatchGAN discriminator to enforce local patches of the generated model to be
similar to those in the training detailed shapes. During testing, a style code
is fed into the generator to condition the refinement. We demonstrate that our
method can refine a coarse shape into a variety of detailed shapes with
different styles. The generated results are evaluated in terms of content
preservation, plausibility, and diversity. Comprehensive ablation studies are
conducted to validate our network designs. Code is available at
https://github.com/czq142857/DECOR-GAN.
