We present SuperNormal, a fast, high-fidelity approach to multi-view 3D
reconstruction using surface normal maps. With a few minutes, SuperNormal
produces detailed surfaces on par with 3D scanners. We harness volume rendering
to optimize a neural signed distance function (SDF) powered by multi-resolution
hash encoding. To accelerate training, we propose directional finite difference
and patch-based ray marching to approximate the SDF gradients numerically.
While not compromising reconstruction quality, this strategy is nearly twice as
efficient as analytical gradients and about three times faster than
axis-aligned finite difference. Experiments on the benchmark dataset
demonstrate the superiority of SuperNormal in efficiency and accuracy compared
to existing multi-view photometric stereo methods. On our captured objects,
SuperNormal produces more fine-grained geometry than recent neural 3D
reconstruction methods.

SuperNormal 是一种快速、高保真度的多视图 3D 重建方法，利用表面法线图生成详细表面，通过多分辨率哈希编码和基于路径的射线行进来优化神经有符号距离函数 (SDF) 的体积渲染，相较于现有的多视图光度立体重建方法，在效率和准确性上表现卓越。

SuperNormal：基于多视角法线融合的神经表面重建

SuperNormal: Neural Surface Reconstruction via Multi-View Normal  Integration

In this paper, we introduce SDM-UniPS, a groundbreaking Scalable, Detailed,
Mask-free, and Universal Photometric Stereo network. Our approach can recover
astonishingly intricate surface normal maps, rivaling the quality of 3D
scanners, even when images are captured under unknown, spatially-varying
lighting conditions in uncontrolled environments. We have extended previous
universal photometric stereo networks to extract spatial-light features,
utilizing all available information in high-resolution input images and
accounting for non-local interactions among surface points. Moreover, we
present a new synthetic training dataset that encompasses a diverse range of
shapes, materials, and illumination scenarios found in real-world scenes.
Through extensive evaluation, we demonstrate that our method not only surpasses
calibrated, lighting-specific techniques on public benchmarks, but also excels
with a significantly smaller number of input images even without object masks.

本文介绍了 SDM-UniPS，一种具有突破性的可扩展，详细，无遮挡和通用的光度立体网络。我们的方法可以恢复惊人复杂的表面法线图，即使在未知的，空间变化的采集条件和非受控环境下。我们已经扩展了先前的通用光度立体网络，以提取空间光特性，利用高分辨率输入图像中的所有可用信息，并考虑表面点之间的非局部交互。此外，我们提出了一个新的合成训练数据集，包括现实世界场景中的各种形状，材料和照明情况。通过广泛的评估，我们证明了我们的方法不仅可以胜过公共基准上的校准的，特定于照明的技术，而且即使没有目标掩模，也可以在显著较少的输入图像下表现出色。