[Joe-Spencer]

Allow glTF export requests to choose tessellation detail, accurate tessellation, and surface-curvature handling. The new optional tessellation object supports five detail presets and a visualization helper. Omitted settings retain the existing request serialization and behavior; partial objects default to High detail with both accuracy flags enabled.

Includes OpenAPI, TypeScript, Python, arbitrary-data, and builder support. Runtime integration is tracked in https://github.com/KittyCAD/format/pull/929.

Validation: all 33 modeling-command library tests and both Python binding-name regression tests pass with all features. OpenAPI generation and validation, the Python/TypeScript/arbitrary feature check, formatting, and diff checks pass.

[codecov]

Codecov Report

❌ Patch coverage is 95.29412% with 4 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (main@39f0882). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
modeling-cmds/src/format/gltf.rs	95.29%	4 Missing ⚠️

Additional details and impacted files

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##             main    #1462   +/-   ##
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  Coverage        ?   38.78%           
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  Files           ?       33           
  Lines           ?     1828           
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  Hits            ?      709           
  Misses          ?     1119           
  Partials        ?        0           

Flag	Coverage Δ
unittests	38.78% <95.29%> (?)

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[alteous]

I'm happy with the internal API but this one needs more work.

I suggest we split out tessellation options from glTF so they can be shared across other formats.

The accurate_surface_curvatures parameter is too concerned with the implementation, it should be removed entirely.

I suggest we replace the accurate parameter with something more intentional:

pub mod tessellation {
    /// Level of detail
    pub struct Lod {
        ...
    }

    // I can't think of a better name right now...
    pub enum Kind {
        // Low accuracy, non-watertight.
        Visual,
        // High accuracy, watertight.
        Analysis,
    }

    pub struct Options {
        pub lod: Lod,
        pub kind: Kind,
    }
}