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@@ -372,8 +372,14 @@ function(create_simplnx_plugin_unit_test)
   #------------------------------------------------------------------------------
   # Require that the test plugins are built before tests because some tests
   # require loading from those plugins but don't want to link to them.
+  #------------------------------------------------------------------------------
   add_dependencies(${UNIT_TEST_TARGET} ${ARGS_PLUGIN_NAME})
 
+  #------------------------------------------------------------------------------
+  # Require all test files be downloaded first before running tests
+  #------------------------------------------------------------------------------
+  add_dependencies(${UNIT_TEST_TARGET} Fetch_Remote_Data_Files)
+
   set_target_properties(${UNIT_TEST_TARGET}
     PROPERTIES
       RUNTIME_OUTPUT_DIRECTORY $<TARGET_FILE_DIR:simplnx>
 
@@ -0,0 +1,66 @@
+# V&V Commit Message Template
+
+This is the standard commit message format for landing a completed V&V cycle on a SIMPLNX filter. It is used by the engineer at Phase 13 (status flip DRAFT → READY FOR REVIEW / COMPLETE), and is the commit that opens the PR.
+
+## Format
+
+```
+VV: <Filter Human Name> fully V&V'ed
+
+Summary:
+- Found and fixed <N> bug(s) (<one-line per bug, or "Confirmed no bugs">);
+- documented <M> deviation(s) from DREAM3D 6.5.171 (<D1 …, D2 …>);
+- retired <P> tests (<reason: circular oracle / UNIMPLEMENTED stub / etc., or "none">);
+- unit tests replaced with <Q> inlined *<Class X (Name) + Class Y (Name)>* test fixtures;
+- added 3 V&V source-tree deliverables (report, deviations, provenance);
+- <optional: doc/pipeline-name fixes, when applicable>.
+```
+
+## Title rules
+
+- Must start with `VV:` (matches existing precedent — e.g., commit `99f3a9865` for `Compute Feature Reference Misorientations`).
+- Use the filter's `humanName()` from the `.cpp` (with spaces, not the class name).
+- End with `fully V&V'ed`. If the cycle is partial (rare — e.g., second-engineer oracle review still pending), end with `— READY FOR REVIEW` instead.
+
+## Body rules
+
+- One bullet per category, even when the count is zero. **Don't drop bullets** — write "Confirmed no bugs" or "no tests retired" so the reader knows the question was asked.
+- Past-tense verbs at the start of each bullet ("Found and fixed", "documented", "retired", "replaced", "added", "fixed").
+- Semicolons at the end of each bullet except the last (period on the last).
+- Inline the deviation IDs (`D1`, `D2`, …) with a 2-3 word reminder of what each one was. The full text lives in `vv/deviations/<FilterName>.md`; the commit message just needs to be greppable.
+- Oracle classes get the parenthetical name (`Class 1 (Analytical)`, `Class 4 (Invariant)`). See `oracle_classes.md` for the canonical class list.
+- The "3 V&V source-tree deliverables" line is invariant across all V&V commits (every cycle produces exactly those 3). Don't rewrite it per-filter.
+
+## Worked example
+
+This is what the F#2 (`ComputeFeatureNeighborMisorientations`) V&V cycle's commit looks like:
+
+```
+VV: Compute Feature Neighbor Misorientations fully V&V'ed
+
+Summary:
+- Found and fixed 1 bug (divisor clobbered inside inner j-loop of algorithm.cpp);
+- documented 2 deviations from DREAM3D 6.5.171 (D1 divisor bug, D2 EbsdLib 2.4.1 precision);
+- retired 2 tests (circular-oracle exemplar consumer + UNIMPLEMENTED stub);
+- unit tests replaced with 4 inlined *Class 1 (Analytical) + Class 4 (Invariant)* test fixtures;
+- added 3 V&V source-tree deliverables (report, deviations, provenance);
+- fixed pipeline-name typo in user-facing doc.
+```
+
+## When a category is zero or N/A
+
+| Situation                                          | Bullet phrasing                                                       |
+|----------------------------------------------------|-----------------------------------------------------------------------|
+| Clean Port, no bugs found                          | `Confirmed no bugs (clean Port);`                                     |
+| No deviations from legacy                          | `Confirmed no deviations from DREAM3D 6.5.171;`                       |
+| Fresh V&V, no prior tests to retire                | `No prior tests retired (fresh V&V cycle);`                           |
+| Existing tests kept, only new ones added           | `Augmented existing tests with <Q> inlined …;`                        |
+| Doc was already correct                            | *omit the last bullet entirely (it's the only optional one)*          |
+| New filter, no legacy equivalent                   | `documented 0 deviations (no legacy equivalent — new filter);`        |
+
+## Why this format
+
+- **Scannable.** A reviewer skimming `git log` should be able to decide whether a V&V commit is worth opening from the title and one bullet pass.
+- **Greppable.** `git log --grep='^VV:'` returns every V&V commit. `git log --grep='D2 EbsdLib'` returns every commit that mentions the EbsdLib precision deviation. The deviation IDs are stable across commits (per the `<FilterName>-D<N>` rule in `deviation_template.md`).
+- **Constrained.** The five fixed categories (bugs / deviations / retired tests / new fixtures / V&V deliverables) match what every V&V cycle produces under the v2 policy. The engineer fills slots rather than designing prose.
+- **Cross-references the source-tree deliverables.** The commit is the "shortest legible record" of the V&V; the long-form analysis lives at `src/Plugins/<Plugin>/vv/{,deviations/,provenance/}<FilterName>.md`. A reader who wants more clicks through.
@@ -10,7 +10,7 @@ The five classes differ in **what they trust** (math, a library, a paper, proper
 
 ## Class 1 — Analytical
 
-**What it is:** You can write down, on paper, the *exact* expected output as a closed-form function of the input. The math is small enough to do by hand or in a spreadsheet on a toy dataset.
+**What it is:** You can write down, on paper, the *exact* expected output as a closed-form function of the input. The math is small enough to do by hand or in a spreadsheet on a hand-built fixture.
 
 **Where the trust comes from:** Mathematics itself. Arithmetic doesn't drift. `2 + 2 == 4` today, tomorrow, and forever.
 
@@ -32,10 +32,20 @@ The five classes differ in **what they trust** (math, a library, a paper, proper
 **Weaknesses:**
 
 - Only works when the algorithm has a tractable closed form on small inputs. Many real algorithms don't (e.g., segmentation, optimization, iterative convergence).
-- Toy datasets may not exercise all code paths in a complex filter.
+- Hand-built fixtures may not exercise all code paths in a complex filter.
 
 **How it's encoded in tests:** Usually inline `REQUIRE(result == 0.6428571)` with a comment showing the hand derivation. Or a tiny exemplar `.dream3d` whose values were hand-computed and the `.dream3d` is just a cache of the computation.
 
+### Naming convention: `AnalyticalFixtures`
+
+The C++ namespace used to hold Class 1 test scaffolding (helpers, struct, fixture builders) is `AnalyticalFixtures` — e.g., `AnalyticalFixtures::CreateScaffold`, `AnalyticalFixtures::FixtureData`.
+
+**Why not `ToyFixtures`?** In CS / ML / testing terminology, "toy example" is the established term for a minimal hand-crafted dataset with a closed-form expected output. It is a precise technical signal — not dismissive — meaning *"this is an analytical oracle, not a regression-on-real-data circular oracle."* The original V&V scaffolding used `ToyFixtures` on those grounds.
+
+**Why `AnalyticalFixtures` then?** SIMPLNX V&V deliverables read to a non-CS-academic audience (SBIR program managers, MTR reviewers, materials engineers). To that audience, "toy" can read as informal or unrigorous — the exact perception V&V is meant to dispel. `AnalyticalFixtures` preserves the load-bearing signal that "Toy" was carrying (*Class 1 closed-form oracle data*) without the dismissive connotation.
+
+The rename was applied 2026-06-10 across all test files, V&V reports, deviations, provenance docs, and templates. The decision is documented here so it doesn't get re-litigated.
+
 ## Class 2 — Reference implementation
 
 **What it is:** A trusted external library — one with broader user base, more testing, and longer history than your filter — computes the same operation on the same input. Its output becomes your expected output.
@@ -50,7 +60,7 @@ The five classes differ in **what they trust** (math, a library, a paper, proper
 - Eigen for linear algebra in C++ tests.
 - A reference Python implementation of an algorithm published as a research paper companion.
 
-**Workflow:** Write a small Python (or other) script that takes the toy input, runs the reference library, and saves the expected output. That script + the library version + any random seed used become part of the V&V archive. Future tests load the saved expected output and compare bit-for-bit (or with appropriate float tolerance).
+**Workflow:** Write a small Python (or other) script that takes the hand-built input, runs the reference library, and saves the expected output. That script + the library version + any random seed used become part of the V&V archive. Future tests load the saved expected output and compare bit-for-bit (or with appropriate float tolerance).
 
 **Strengths:**
 
@@ -216,7 +226,7 @@ If the existing exemplar in the data archive was generated from one of the above
 
 | Class | Name | Best for | Default choice when |
 |---|---|---|---|
-| 1 | Analytical | Tight algorithms with closed-form output, hand-pickable toy inputs, small outputs | The math is short enough to do on paper |
+| 1 | Analytical | Tight algorithms with closed-form output, hand-pickable hand-built inputs, small outputs | The math is short enough to do on paper |
 | 2 | Reference impl | Algorithms where a trusted library exists and you trust it more than your own implementation | You're porting an algorithm that has a well-known library implementation elsewhere |
 | 3 | Paper-based | Implementations of published algorithms (orientation math, classical algorithms with named authors) | The filter's header cites a paper |
 | 4 | Invariant | Anything with conservation laws, range bounds, or structural constraints | Always — add Class 4 alongside whatever other class you pick |
 
@@ -48,7 +48,7 @@ The dashboard a reviewer reads first. Lets a reviewer decide in 30 seconds wheth
 For detailed explanations of each class — with examples, strengths and weaknesses, drift-risk analysis, and a decision tree for picking the right class — see [`oracle_classes.md`](./oracle_classes.md). The summary below is the gate checklist.
 
 - [ ] Class named (1–5)
-  - 1 = Analytical (closed-form expected output on toy input)
+  - 1 = Analytical (closed-form expected output on hand-built input)
   - 2 = Reference implementation (NumPy / SciPy / MTEX / EbsdLib upstream)
   - 3 = Paper-based (published figure / table / equation)
   - 4 = Invariant-based (derivable property the output must satisfy)
 
@@ -24,7 +24,7 @@ Every filter must be verified against at least one of the following. Classes 1
 
 | # | Class | What it is | Drift risk |
 |---|---|---|---|
-| 1 | Analytical | Closed-form expected output on toy input (threshold, crop, rotate, color conversion, array arithmetic) | None |
+| 1 | Analytical | Closed-form expected output on hand-built input (threshold, crop, rotate, color conversion, array arithmetic) | None |
 | 2 | Reference implementation | Trusted external library produces the expected output (NumPy / SciPy / MTEX / EbsdLib upstream / Eigen) | **High** — library version drift |
 | 3 | Paper-based | Filter reproduces a published figure, table, or equation from a named reference | Low–Medium |
 | 4 | Invariant | Derivable properties the output must satisfy (FeatureIds start at 1 and contiguous; sum of phase fractions = 1; mass conservation) | None |
@@ -56,6 +56,7 @@ The verified state is pinned by **(commit hash, archive SHA512)**. The commit ca
 | [`report_gates.md`](./report_gates.md) | Per-section "Done when:" checklists — reference while filling in the report |
 | [`deviation_template.md`](./deviation_template.md) | Empty deviation file — copy into `src/Plugins/<P>/vv/deviations/<FilterName>.md` |
 | [`provenance_template.md`](./provenance_template.md) | Empty exemplar-provenance sidecar — copy per exemplar archive |
+| [`commit_template.md`](./commit_template.md) | Standard commit message format for landing a completed V&V cycle — use at step 6 of the engineer workflow below |
 
 ## Engineer workflow
 
@@ -64,7 +65,7 @@ The verified state is pinned by **(commit hash, archive SHA512)**. The commit ca
 3. Run `python scripts/vv_init.py <FilterName>` to scaffold the report and deviation files in the plugin tree.
 4. Open `report_gates.md` in a second tab.
 5. Work each section in any order. A section is "done" when all its gates pass.
-6. When all gates green, set `Status: READY FOR REVIEW`, push a `vv/<FilterName>` branch.
+6. When all gates green, set `Status: READY FOR REVIEW`, push a `vv/<FilterName>` branch with a commit following [`commit_template.md`](./commit_template.md).
 7. After sign-off, set `Status: COMPLETE`. Verified commit hash is filled in at SBIR deliverable assembly.
 
 ## Status tracking across filters
 
@@ -35,12 +35,18 @@ changing voxels.
 ### 2D Versus 3D Note
 
 If the user is processing a 2D data set, **none** of the voxels can have 6 neighbors
-since there are no neighbors is the +-Z directions.
+since there are no neighbors in the +/-Z directions.
 
 ### Warning - Data Modification
 
 Only the *Mask* value defining the cell as *good* or *bad* is changed. No other cell level array is modified.
 
+### Memory Considerations
+
+The filter allocates a temporary `int32` neighbor-count array sized to the total voxel count
+(4 bytes per voxel). For a 1-billion-voxel dataset, that is approximately 4 GB of additional
+working memory during execution. This memory is released when the filter finishes.
+
 ## Example Data
 
 | Example Input Image                                                       | Example Output Image                                                                                                                          |
@@ -55,8 +61,12 @@ From the above before and after images you can see that this filter can help mod
 ## Example Pipelines
 
 + (02) Small IN100 Full Reconstruction
-+ INL Export
-+ 04_Steiner Compact
+
+## Related Filters
+
+- [Fill Bad Data](../SimplnxCore/FillBadDataFilter.md) — fills voxels still marked bad after this filter runs (or as a standalone alternative when no orientation data is available).
+- [Multi-Threshold Objects](../SimplnxCore/MultiThresholdObjectsFilter.md) — typical upstream filter that generates the initial *Mask* array (e.g., from `Confidence Index` and `Image Quality`).
+- [Replace Element Attributes with Neighbor Values](../SimplnxCore/ReplaceElementAttributesWithNeighborValuesFilter.md) — alternative cleanup approach that copies attribute values from neighboring cells rather than flipping a mask.
 
 ## License & Copyright
 
 
@@ -6,29 +6,44 @@ Statistics (Crystallography)
 
 ## Description
 
-This **Filter** determines the average C-axis location of each **Feature** by the following algorithm:
+This **Filter** computes the average C-axis direction for each **Feature** (grain) in hexagonal materials. The result is a unit vector per **Feature** that indicates where the grain's C-axis points in the sample reference frame.
 
-1. Gather all **Elements** that belong to the **Feature**
-2. Determine the location of the c-axis in the sample *reference frame* for the rotated quaternions for all **Elements**. This is achieved by converting the input quaternion to
-an orientation matrix (which represents a passive transform matrix), taking the transpose of the matrix to convert it from passive to active, and then multiplying the
-transposed matrix by the crystallographic C-Axis direction vector <001>.
-3. Average the locations and store the average for the **Feature**
+### What is the C-Axis?
 
-*Note:* This **Filter** will only work properly for *Hexagonal* materials.  The **Filter** does not apply any symmetry 
-operators because there is only one c-axis (<001>) in *Hexagonal* materials and thus all symmetry operators will leave 
-the c-axis in the same position in the sample *reference frame*.  However, in *Cubic* materials, for example, the {100} 
-family of directions are all equivalent and the <001> direction will change location in the sample *reference frame* when 
-symmetry operators are applied.
+In hexagonal crystal structures (such as titanium, magnesium, and zinc), the *C-axis* is the unique crystallographic direction that runs along the long axis of the hexagonal unit cell (the [001] direction). This axis is important because many mechanical and physical properties of hexagonal materials vary depending on whether they are measured along or perpendicular to the C-axis.
 
-This filter will error out if **ALL** phases are non-hexagonal. Any non-hexagonal phases will have their computed values set to NaN value.
+![Fig. 1: The C-axis in a hexagonal unit cell.](Images/ComputeAvgCAxes_HexagonalCAxis.png)
 
-The output is a direction vector for each feature.
+### How This Filter Works
+
+Each **Cell** (voxel) in a grain has its own measured orientation. This filter determines where each cell's C-axis points in the physical sample coordinate system, then averages those directions across all cells belonging to the same **Feature**:
+
+1. For each **Cell**, the filter uses the cell's orientation (quaternion) to rotate the crystal [001] direction into the sample reference frame.
+2. The rotated C-axis directions are accumulated for each **Feature**, ensuring all directions point into the same hemisphere for a consistent average.
+3. The accumulated directions are normalized to produce a unit vector for each **Feature**.
+
+### Hexagonal Materials Only
+
+This filter only produces valid results for hexagonal phases (6/mmm or 6/m symmetry). In hexagonal materials, the C-axis is unique -- there is only one [001] direction, so crystal symmetry does not create ambiguity.
+
+In cubic materials, the [001], [010], and [100] directions are all crystallographically equivalent. Applying symmetry operators would move the [001] direction to different positions in the sample frame, making a simple average meaningless. For this reason, the filter **silently skips non-hexagonal cells** during accumulation. A **Feature** whose contributing cells are *all* non-hexagonal (or which has no cells assigned to it at all) will have its output set to **NaN**.
+
+The filter will produce an error if no hexagonal phases are present in the data (`-76402`: "No phases that have a crystal symmetry of Hexagonal (6/mmm or 6/m) were found.").
+
+### Required Input Sources
+
+This filter operates on previously segmented data and requires that several prior operations have already been run:
+
+- **Cell Quaternions** -- typically read from EBSD data via [Read H5EBSD](ReadH5EbsdFilter.md), [Read CTF Data](ReadCtfDataFilter.md), or [Read ANG Data](ReadAngDataFilter.md); can also be produced from Euler angles by [Convert Orientations](ConvertOrientationsFilter.md).
+- **Cell Feature Ids** -- produced by a segmentation filter such as [Segment Features (Misorientation)](EBSDSegmentFeaturesFilter.md) or [Segment Features (C-Axis Misalignment)](CAxisSegmentFeaturesFilter.md).
+- **Cell Phases** -- typically read from EBSD data alongside the quaternions.
+- **Crystal Structures** -- ensemble-level array read from EBSD data or created by [Create Ensemble Info](CreateEnsembleInfoFilter.md).
 
 % Auto generated parameter table will be inserted here
 
 ## Example Pipelines
 
-EBSD_Hexagonal_Data_Analysis
++ `EBSD_Hexagonal_Data_Analysis`
 
 ## License & Copyright