Ft mfem 3d single-patch IO

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Walkthrough

The recent updates enhance the NURBS spline handling in the splinepy/io/mfem.py module, specifically by improving the loading and exporting functionalities. The changes ensure accurate knot vector processing, better validation, and support for multiple dimensions, particularly addressing 3D cases. Additionally, a new test function test_mfem_single_patch_export has been introduced to validate these functionalities.

Changes

File / Module	Change Summary
`splinepy/io/mfem.py`	Updated `load` and `export` functions: enhanced knot vector handling, added 3D support, validation logic improvements.
`tests/io/test_mfem_export.py`	Added `test_mfem_single_patch_export` to validate MFEM single patch export.

Sequence Diagram(s)

sequenceDiagram
    participant User
    participant SplineLoader
    participant SplineExporter

    Note over User, SplineLoader: Loading a spline
    User->>SplineLoader: Call load function
    SplineLoader->>SplineLoader: Initialize degrees, ncps, knot_vectors
    SplineLoader->>SplineLoader: Populate knot_vectors using loop
    SplineLoader->>SplineLoader: Validate spline information
    SplineLoader-->>User: Return loaded spline

    Note over User, SplineExporter: Exporting a spline
    User->>SplineExporter: Call export function
    SplineExporter->>SplineExporter: Check for mixed orders
    SplineExporter->>SplineExporter: Handle 3D section (elements, boundaries, etc.)
    SplineExporter->>SplineExporter: Format knot vectors using kv_sec
    SplineExporter-->>User: Return exported spline

Poem

In code we weave the spline's delight,
With knot and point, dimensions bright.
Through 3D space our paths entwine,
Export, import - the process shines.
Celebrate the patch, a single quest,
For NURBS now perform their best!
🌟✨

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tataratat / splinepy