# Project and community

FDTDX is open-source research software. This fork's contribution is a transparent path from solver implementation to evidence: cases, tolerances, provenance, and known limits are kept together.

::::{grid} 1 2 2 2
:gutter: 3

:::{grid-item-card} Visual optimization campaign atlas
:link: optimization_campaigns
:link-type: doc

Every live and archived optimization in one image-first directory. Each card
pairs the actual geometry with its electric-field profile.
:::

:::{grid-item-card} Inverse-designed cavities and atom interfaces
:link: ../examples/categories/inverse-designed-cavities
:link-type: doc

All nanobeam, remote-atom, curved-mirror, atom-gap, beta-first, and SiN cavity
campaigns are collected in one section, including frozen results, failed
attempts, validation records, geometries, and fields.
:::

:::{grid-item-card} Validation status
:link: validation
:link-type: doc

What passes today, what is blocked, and what those labels actually mean.
:::

:::{grid-item-card} Benchmark protocol
:link: benchmark_protocol
:link-type: doc

Goldens, resolution-aware metrics, inverse-design parity, and anti-cheating rules.
:::

:::{grid-item-card} Inverse-design fidelity audit
:link: inverse_design_audit
:link-type: doc

Why former green FOMs were withdrawn, exact notebook discrepancies, symmetry normalization, and GPU memory evidence.
:::

:::{grid-item-card} Capability roadmap
:link: roadmap
:link-type: doc

Strong areas and the work needed to approach broad Tidy3D-like FDTD coverage.
:::

:::{grid-item-card} Contribute
:link: contributing
:link-type: doc

Develop the solver, add a case, improve docs, or reproduce an existing result.
:::

:::{grid-item-card} Cite and credit
:link: citation
:link-type: doc

Credit upstream FDTDX and identify the validation fork in reproducible work.
:::

:::{grid-item-card} License
:link: license
:link-type: doc

MIT terms, attribution, and the distinction between FDTDX and Tidy3D.
:::

::::

```{toctree}
:hidden:
:maxdepth: 1

validation
optimization_campaigns
atom_strip_seed_width_sweep_dashboard
atom_strip_seed_width_sweep_sin300_dashboard
benchmark_protocol
inverse_design_audit
roadmap
contributing
citation
license
```