Credits & licenses

What these tools are built on, and the terms that come with it. Anything not listed here is original work.

Ported code

msdfgen MIT License

The SDF Generator's three-channel (MSDF) output is a JavaScript port of msdfgen 1.13 by Viktor Chlumský: the edge colouring, the perpendicular-distance selectors, the edge cache and the error correction. The method is from his thesis Shape Decomposition for Multi-channel Distance Fields (Czech Technical University in Prague, 2015).

License text

MIT License

Copyright (c) 2014 - 2025 Viktor Chlumsky

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

Compiled code

BCn codec (bcn.wasm, bcn-simd.wasm) MIT License or Apache License 2.0: Original Rust code compiled to WebAssembly. The binaries link parts of the Rust standard library and the dlmalloc-rs allocator, both offered under either license.

AI depth model and runtime

The Normal Map Generator's Generate depth button downloads these on first use, from jsDelivr and Hugging Face. They are the only requests the site makes to other hosts. The image itself is processed in your browser and is never uploaded.

Depth Anything V2 Small Apache License 2.0: Lihe Yang, Bingyi Kang, Zilong Huang, Zhen Zhao, Xiaogang Xu, Jiashi Feng and Hengshuang Zhao, Depth Anything V2, arXiv:2406.09414, 2024. Served as the ONNX conversion onnx-community/depth-anything-v2-small, also Apache License 2.0.
Transformers.js Apache License 2.0: Hugging Face. Loads the model and runs it on WebGPU or WebAssembly.
ONNX Runtime Web MIT License: Microsoft. The inference engine underneath Transformers.js.

Papers and algorithms

Chris Green, Improved Alpha-Tested Magnification for Vector Textures and Special Effects: SIGGRAPH 2007 course Advanced Real-Time Rendering in 3D Graphics and Games, Valve. The two-channel sharp-corner field in the SDF Generator.
Pedro F. Felzenszwalb and Daniel P. Huttenlocher, Distance Transforms of Sampled Functions: Theory of Computing 8(19), 2012. The Euclidean distance transform behind every field.
Peter Selinger, Potrace: a polygon-based tracing algorithm: 2003. The turn policy for tracing pixel boundaries and the placement of corner apexes at the intersection of fitted edge lines. The paper's ideas only; no Potrace code is used.
Dmitry Chetverikov and Zsolt Szabó, A simple and efficient algorithm for detection of high curvature points in planar curves: Proceedings of the 23rd Workshop of the Austrian Pattern Recognition Group, 1999. Corner detection on traced contours.
David H. Douglas and Thomas K. Peucker, Algorithms for the reduction of the number of points required to represent a digitized line or its caricature: Cartographica 10(2), 1973. Contour simplification.
Bruce Walter, Stephen R. Marschner, Hongsong Li and Kenneth E. Torrance, Microfacet Models for Refraction through Rough Surfaces: Eurographics Symposium on Rendering, 2007. The GGX shading in the Normal Map Generator's lit preview.

Fonts

Azeret Mono SIL Open Font License 1.1: Copyright 2021 The Azeret Project Authors. License.

Both fonts are served from this site as Latin subsets, so no font request goes to a third party.

Everything else

The BCn encoder and decoder, the normal-map and distance-field pipelines, the PNG and DDS writers and the page code are original work. The pages load no analytics, no third-party scripts and no third-party images.