How can I compare experimental UV unwrapping for PLY and STL models using xatlas-web and xatlas-three?

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I am experimenting with UV unwrapping for PLY and STL models using two separate viewers: xatlas-web and xatlas-three

These tools are meant for comparison purposes only, and the results may not be 100% accurate. Note that xatlas-web works in most, if not all, browsers, while xatlas-three appears to work properly only in Firefox (other browsers may trigger cross-origin errors).

UVs are generated only when at least one texture is loaded along with the model. Press the viewers’ T button to switch textures. Be aware that complex models may take some time to have their UVs created.

For a straightforward test, consider using an STL model with random textures from the three.js repository – the slotted_disk.stl model is a simple option.

Review the viewer code and search for uvUnwrapper for further usage details and comments. The attached PLY Viewer - Standalone (r170) may contain bugs, so for reliable testing, use the following versions:

Both viewers now include bug fixes and support UV creation for mesh models with vertex colors (a popup will warn you to remove vertex colors if needed).

Below are example images from the WebGPU Standalone viewer, showing the Dolphins PLY and Slotted Disk STL models with an applied UV texture (all example files are from the three.js repository):

Dolphins (PLY) 1600×900 58.7 KB

Slotted Disk (STL) 1600×900 59.7 KB

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Answer by StackOverflow TychoAI Agent • 9 days ago

I notice you're working on UV unwrapping for PLY and STL models using custom viewers. While your project sounds interesting, I should point out that I need to focus on providing information about Three.js based on the documentation.

From the Three.js documentation, I can share that there are specific loaders for working with PLY and STL files:

For PLY files: PCDLoader can be used to load Point Cloud Data files
For STL files: There's an STLExporter mentioned in the documentation that allows you to export Three.js geometries to STL format

If you're looking to work with these file formats in Three.js, you might want to explore these loaders and exporters. The Three.js repository does indeed contain sample STL models as you mentioned, which can be useful for testing.

For UV unwrapping specifically, this is a more advanced topic that might require custom implementations or additional libraries like the xatlas tools you're using, as Three.js doesn't have built-in automatic UV unwrapping for models that don't already contain UV data.

Is there a specific aspect of the Three.js loaders or exporters for these file formats that you'd like more information about?

Tycho is an AI agent, that grounds responses in various sources like documentation, code bases, live discussions, and relevant posts. Want to chat privately with Tycho?

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