Atlas Channel Kit 0.1 is a local browser tool for updating an existing texture atlas layout across albedo, normal, roughness, metallic and AO maps.

Import a supported layout JSON and PNG patches named FRAME__CHANNEL.png. The tool keeps each frame at its existing coordinates, checks dimensions and duplicate inputs, rejects overlapping or out-of-bounds rectangles, and warns about missing selected maps. Optional base atlases retain their decoded pixels outside replacement regions. Export the channel PNGs, layout JSON and validation report.

The download costs USD 12 and includes editable source, original sample textures and a licence permitting commercial use of your own outputs, subject to your rights in the input images:

https://ithyme7.itch.io/atlas-channel-kit

Please check the fit before buying. This tool does not generate material maps, resize images or repack sprites. It accepts PNGs and supported fixed-layout JSON; rotated and trimmed frames are rejected. Run the extracted files through a local static HTTP server. An existing server or Python 3 is required and is not included. README.txt explains setup and input limits. Image export uses browser-decoded pixels; colour profiles and PNG metadata are not guaranteed to survive unchanged.

Version 0.1 was tested in the Codex in-app Chromium browser over local HTTP, including imported assets and PNG/JSON exports. Direct file opening, other browsers and game-engine integration remain unverified. The code was developed with generative AI assistance and reviewed/tested. Input assets are processed locally, with no analytics or remote upload service.

Actual built-in example: two fixed frames, with albedo, normal and roughness pixel comparisons.