Attribute converter nodes

[Alxiice]

Description

Register nodes for attribute conversion.

How does it work

• AttributeConverter nodes are declaring what type conversion they are doing, and they implement a convert method to handle the conversion. A notion of priority is used to know what is the default conversion from a type to another.
• These nodes are registered through the plugin system.
• We allow connection from type A and type B if A=B or if a converter exist for A->B.
• When an edge is created with a converter, the converter is saved on the Edge object.
• When the graph is saved, we serialize the converters, and when the graph is loaded we unserialize them.
• We can change the converter through the interface with a right click on the converter badge:

[gemini-code-assist]

Code Review

This pull request introduces an AttributeConverter framework to support automatic conversion of attribute values between different types, along with several default converter implementations and integration into the meshroom_info CLI. The review feedback highlights several critical improvements: resolving potential TypeError and AttributeError exceptions in the converter registry and base class, correcting a class name mismatch in the boolean-to-integer converter, ensuring Liskov Substitution Principle compliance for isValid signatures, preventing a variable overwrite in the CLI parser, and maintaining return type consistency in converter loading functions.

Important

The consumer version of Gemini Code Assist on GitHub is being sunset. Starting June 18, 2026, new organization installations will be blocked, and all code review activity will officially cease on July 17, 2026.
For more details on the timeline and next steps, please review the Help Documentation.

[codecov]

Codecov Report

❌ Patch coverage is 71.65775% with 53 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.85%. Comparing base (1d89d80) to head (c78b245).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
meshroom/core/graph.py	58.53%	34 Missing ⚠️
meshroom/core/attributeConverter.py	74.07%	14 Missing ⚠️
meshroom/core/attribute.py	86.36%	3 Missing ⚠️
meshroom/core/__init__.py	90.90%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3161      +/-   ##
===========================================
- Coverage    86.07%   85.85%   -0.23%     
===========================================
  Files           78       79       +1     
  Lines        12111    12274     +163     
===========================================
+ Hits         10425    10538     +113     
- Misses        1686     1736      +50     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[fabiencastan]

It would be better to have lightweight nodes (without computation like InitNode) for edge expressions.