  We present Paint-it, a text-driven high-fidelity texture map synthesis method
for 3D meshes via neural re-parameterized texture optimization. Paint-it
synthesizes texture maps from a text description by
synthesis-through-optimization, exploiting the Score-Distillation Sampling
(SDS). We observe that directly applying SDS yields undesirable texture quality
due to its noisy gradients. We reveal the importance of texture
parameterization when using SDS. Specifically, we propose Deep Convolutional
Physically-Based Rendering (DC-PBR) parameterization, which re-parameterizes
the physically-based rendering (PBR) texture maps with randomly initialized
convolution-based neural kernels, instead of a standard pixel-based
parameterization. We show that DC-PBR inherently schedules the optimization
curriculum according to texture frequency and naturally filters out the noisy
signals from SDS. In experiments, Paint-it obtains remarkable quality PBR
texture maps within 15 min., given only a text description. We demonstrate the
generalizability and practicality of Paint-it by synthesizing high-quality
texture maps for large-scale mesh datasets and showing test-time applications
such as relighting and material control using a popular graphics engine.
Project page: https://kim-youwang.github.io/paint-it
