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UVAtlas isochart texture atlas

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UVAtlas - isochart texture atlasing

Copyright (c) Microsoft Corporation.

November 8, 2021

This package contains UVAtlas, a shared source library for creating and packing an isochart texture atlas.

This code is designed to build with Visual Studio 2017 (15.9), Visual Studio 2019, Visual Studio 2022, or clang for Windows v11 or later. Use of the Windows 10 May 2020 Update SDK (19041) or later is required.

These components are designed to work without requiring any content from the legacy DirectX SDK. For details, see Where is the DirectX SDK?.

Directory Layout

  • Inc\
    • Public Header File (in the DirectX C++ namespace):
    • UVtlas.h
      • UVAtlasCreate
      • UVAtlasPartition
      • UVAtlasPack
      • UVAtlasComputeIMTFromPerVertexSignal
      • UVAtlasComputeIMTFromSignal
      • UVAtlasComputeIMTFromTexture
      • UVAtlasComputeIMTFromPerTexelSignal
      • UVAtlasApplyRemap
  • geodesics\
    • Library source files
  • UVAtasTool\
    • Command line tool and sample for UVAtlas library


Documentation is available on the GitHub wiki.


All content and source code for this package are subject to the terms of the MIT License.

For the latest version of UVAtlas, bug reports, etc. please visit the project site on GitHub.

Further reading

Zhou et al, "Iso-charts: Stretch-driven Mesh Parameterization using Spectral Analysis", Eurographics Symposium on Geometry Processing (2004) pdf

Sander et al. "Signal-Specialized Parametrization" Europgraphics 2002 pdf

Release Notes

  • Starting with the December 2020 release, this library makes use of typed enum bitmask flags per the recommendation of the C++ Standard section Bitmask types. This is consistent with Direct3D 12's use of the

    macro. This may have breaking change impacts to client code:
    • You cannot pass the
      literal as your option flags value. Instead you must make use of the appropriate default enum value:
    • Use the enum type instead of
      if building up flags values locally with bitmask operations. For example,
      UVATLAS options = UVATLAS_DEFAULT; if (...) options |= UVATLAS_GEODESIC_FAST;
  • The UWP projects and the Win10 classic desktop project include configurations for the ARM64 platform. These require VS 2017 (15.9 update) or later to build, with the ARM64 toolset installed.


This project welcomes contributions and suggestions. Most contributions require you to agree to a Contributor License Agreement (CLA) declaring that you have the right to, and actually do, grant us the rights to use your contribution. For details, visit

When you submit a pull request, a CLA bot will automatically determine whether you need to provide a CLA and decorate the PR appropriately (e.g., status check, comment). Simply follow the instructions provided by the bot. You will only need to do this once across all repos using our CLA.

This project has adopted the Microsoft Open Source Code of Conduct. For more information see the Code of Conduct FAQ or contact [email protected] with any additional questions or comments.


This project may contain trademarks or logos for projects, products, or services. Authorized use of Microsoft trademarks or logos is subject to and must follow Microsoft's Trademark & Brand Guidelines. Use of Microsoft trademarks or logos in modified versions of this project must not cause confusion or imply Microsoft sponsorship. Any use of third-party trademarks or logos are subject to those third-party's policies.

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