From b75ed784b4ddf8af92ef2148bde0d8caad3e305e Mon Sep 17 00:00:00 2001
From: gsdali <51393997+gsdali@users.noreply.github.com>
Date: Wed, 5 Aug 2026 09:44:53 +1000
Subject: [PATCH 1/6] fix: select recipe 01's inside-corner fillet edge
 geometrically (#105)

prism.concaveEdges() returns the wrong two edges on this L-bracket's extruded
shape: the top-cap boundary segments at z = width (each bounded by the 5 mm leg
thickness), not the one true reentrant edge that runs the full extrusion width
(bounded only by legLength - thickness, 45 mm). filletRadius = 8 was infeasible
for the wrong edges and BRepFilletAPI returned nil, hidden behind a `?? prism`
fallback that shipped an un-filleted bracket while the header and README kept
describing a filleted one.

Select the true edge geometrically instead, with Shape.edges(where:): a line
parallel to the extrusion axis positioned at (thickness, thickness). The same
filletRadius = 8 now applies cleanly, comfortably under the corrected 45 mm
limit, and adds 549.38 mm3 to the prism, matching the analytic
r^2 * (1 - pi/4) * width prediction for one concave fillet to five significant
figures. Verified against the real occtkit run + metrics path, not just the
in-process diagnostic: solidCount stays 1, bounding box is unchanged (the
fillet fills part of the existing envelope rather than growing it), and the
final drilled bracket now measures 18779.69 mm3 against the previous
un-filleted reference of 18230.31 mm3, exactly the fillet's added volume.

Regenerated output.brep and output.png. Updated the recipe header, its
README, and the top-level recipes/README.md line, all of which described
concaveEdges() as the selection mechanism; that prose now matches what the
code does and explains why concaveEdges() was wrong here.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
---
 recipes/01-mounting-bracket/README.md   |  41 +-
 recipes/01-mounting-bracket/main.swift  |  36 +-
 recipes/01-mounting-bracket/output.brep | 510 ++++++++++++++----------
 recipes/01-mounting-bracket/output.png  | Bin 18967 -> 18888 bytes
 recipes/README.md                       |   2 +-
 5 files changed, 362 insertions(+), 227 deletions(-)

diff --git a/recipes/01-mounting-bracket/README.md b/recipes/01-mounting-bracket/README.md
index a32747d..abe2dec 100644
--- a/recipes/01-mounting-bracket/README.md
+++ b/recipes/01-mounting-bracket/README.md
@@ -18,28 +18,45 @@ An L-shaped mounting bracket with a rounded inside corner and four through-holes
 ## Algorithm
 
 The L cross-section is built as a closed polygon in the XY plane and extruded along Z into
-a prism. The inside corner is then rounded by filleting the solid's **concave edge**,
-located geometrically with `Shape.concaveEdges()`: no fragile edge-index bookkeeping, and
-it tracks the corner as parameters change. The fillet is applied *before* drilling so
-`concaveEdges()` returns only the reentrant corner. Finally four holes are cut: two through
-the base leg (drilled along Y) and two through the upright leg (drilled along X). Each drill
-starts 1 mm outside the entry face and over-runs the exit by 1 mm so the resulting cut faces
-are clean and coincident-face artifacts are avoided.
+a prism. The reentrant vertex at `(thickness, thickness)` extrudes to exactly one concave
+edge: a straight line parallel to the extrusion axis. That is the edge this recipe fillets,
+adding a rounded blend that fills part of the sharp inside corner. It is selected
+**geometrically**, with `Shape.edges(where:)`, not with `Shape.concaveEdges()`: on this
+shape that call returns a different pair of edges (see Gotchas), so the selector checks
+directly for a line edge parallel to Z sitting at `(thickness, thickness)`. This tracks the
+corner as parameters change without a fragile edge index. The fillet is applied *before*
+drilling so the selector only ever sees the corner edge, not a drilled hole's rim. Finally
+four holes are cut: two through the base leg (drilled along Y) and two through the upright
+leg (drilled along X). Each drill starts 1 mm outside the entry face and over-runs the exit
+by 1 mm so the resulting cut faces are clean and coincident-face artifacts are avoided.
 
 ## OCCTSwift APIs used
 
 - `Wire.polygon(_:closed:)`: L-shaped cross-section
 - `Shape.extrude(profile:direction:length:)`: profile → prism
-- `Shape.concaveEdges()`: find the reentrant inside-corner edge (OCCTSwift v1.3.1)
+- `Shape.edges(where:)`: select the inside-corner edge geometrically (OCCTSwift v1.2.1)
 - `Shape.filleted(edges:radius:)`: round that edge
 - `Shape.drilled(at:direction:radius:depth:)`: the four through-holes
-- `Shape.volume`: sanity print
+- `Shape.volume`: sanity print, and the check that the fillet actually ran
 
 ## Gotchas
 
-- Fillet **before** drilling: `concaveEdges()` classifies *every* concave edge, and a
-  drilled hole's rim can read as concave. Filleting first keeps the selection to just the
-  inside corner. (Tighten `concaveEdges(angle:)` if a near-flat junction sneaks in.)
+- **`Shape.concaveEdges()` picks the wrong edges on this shape.** It returns two edges
+  instead of one: the top-cap boundary segments at `z = width` where each wall meets the
+  end face (each running the leg length, not the extrusion width), rather than the true
+  reentrant edge. Those two are bounded by the 5 mm leg thickness, so a fillet on them fails
+  above roughly that radius; that mismatch is what let `filletRadius = 8` silently no-op
+  behind a `?? prism` fallback for as long as this recipe used `concaveEdges()`
+  (OCCTSwiftScripts #105). The true inside-corner edge has no such limit (its bound is
+  `legLength − thickness`, 45 mm here), which is why the same `filletRadius = 8` works fine
+  once the correct edge is selected.
+- **A concave fillet adds material, it does not remove it.** Rounding the inside corner
+  fills part of the sharp reentrant point with a blend, so `bracket.volume` after the
+  fillet is *larger* than the prism's, by `filletRadius² · (1 − π/4) · width`. Do not expect
+  a volume decrease as evidence the fillet ran; check the increase against that formula
+  instead.
+- Fillet **before** drilling: a drilled hole's rim sitting near the corner could otherwise
+  confuse a looser selector. Filleting first keeps the selection to just the inside corner.
 - Drill start points sit *outside* the part and `depth` over-runs the thickness so the
   hole punches fully through; drilling exactly on a face can leave a sliver.
 - The bracket is a single solid emitted as `body-0` (the reference `output.brep`).
diff --git a/recipes/01-mounting-bracket/main.swift b/recipes/01-mounting-bracket/main.swift
index 08d5027..49a4409 100644
--- a/recipes/01-mounting-bracket/main.swift
+++ b/recipes/01-mounting-bracket/main.swift
@@ -3,10 +3,21 @@
 // Inputs:  none (edit the parameter block below)
 // Outputs: one solid body: an L-bracket with a filleted inside corner and four
 //          through-holes (two per leg).
-// Notes:   The inside corner is rounded by filleting the solid's concave edge, found
-//          geometrically with Shape.concaveEdges() (OCCTSwift v1.3.1, #171) rather than
-//          by a fragile edge index. Fillet before drilling so concaveEdges() returns only
-//          the reentrant corner. Holes are drilled through the leg thickness with a small
+// Notes:   The reentrant corner at (thickness, thickness) extrudes to exactly one
+//          concave edge, a straight line parallel to the extrusion axis. That is the
+//          edge this recipe fillets. It is NOT the edge `Shape.concaveEdges()` finds:
+//          on this shape that call returns two different edges instead, the top-cap
+//          boundary segments at z = width where each wall meets the end face, each
+//          running the leg length rather than the extrusion width (OCCTSwiftScripts
+//          #105). Those two are bounded by the 5 mm leg thickness and a fillet there
+//          fails above roughly that radius, which is why `filletRadius = 8` used to
+//          silently no-op behind a `?? prism` fallback. The true inside-corner edge has
+//          no such limit (its bound is legLength − thickness, 45 mm here), so this
+//          recipe selects it explicitly with `Shape.edges(where:)`: a line parallel to
+//          the extrusion axis positioned at (thickness, thickness), the same
+//          geometric-selection approach recipe 03 uses for the pipe flange (#103).
+//          Fillet before drilling so the selector only ever sees the corner edge, not a
+//          drilled hole's rim. Holes are drilled through the leg thickness with a small
 //          overshoot so the cut faces stay clean.
 //
 // Run:  swift run occtkit run recipes/01-mounting-bracket/main.swift --format brep
@@ -18,7 +29,8 @@ import ScriptHarness
 let legLength: Double  = 50    // length of each leg, measured from the heel (mm)
 let thickness: Double  = 5     // material thickness of each leg (mm)
 let width: Double      = 40    // bracket width (extrusion depth, mm)
-let filletRadius: Double = 8   // inside-corner radius (mm)
+let filletRadius: Double = 8   // inside-corner radius (mm); fits comfortably under the
+                                // legLength − thickness = 45 mm geometric limit (see below)
 let holeRadius: Double  = 3.5  // mounting-hole radius (mm)
 
 let ctx = ScriptContext(metadata: ManifestMetadata(
@@ -37,7 +49,19 @@ let lProfile = Wire.polygon([
 
 // ── Extrude to a solid prism, then round the concave (inside-corner) edge ─────
 let prism = Shape.extrude(profile: lProfile, direction: SIMD3(0, 0, 1), length: width)!
-var bracket = prism.filleted(edges: prism.concaveEdges(), radius: filletRadius) ?? prism
+
+// The inside corner is the one straight edge parallel to the extrusion axis (Z) that
+// sits at (thickness, thickness): select it geometrically rather than trusting
+// concaveEdges(), which picks the wrong edges on this shape (see the header note).
+let insideCorner = prism.edges { edge in
+    guard edge.isLine else { return false }
+    let b = edge.bounds
+    let runsFullWidth = abs((b.max.z - b.min.z) - width) < 1e-6
+        && abs(b.max.x - b.min.x) < 1e-6 && abs(b.max.y - b.min.y) < 1e-6
+    guard runsFullWidth else { return false }
+    return abs(b.min.x - thickness) < 1e-6 && abs(b.min.y - thickness) < 1e-6
+}
+var bracket = prism.filleted(edges: insideCorner, radius: filletRadius)!
 
 // ── Four through-holes: two in the base leg (drill along Y), two in the upright
 //    leg (drill along X). Start just outside the entry face and over-run the exit.
diff --git a/recipes/01-mounting-bracket/output.brep b/recipes/01-mounting-bracket/output.brep
index 44253a0..2a15ead 100644
--- a/recipes/01-mounting-bracket/output.brep
+++ b/recipes/01-mounting-bracket/output.brep
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diff --git a/recipes/01-mounting-bracket/output.png b/recipes/01-mounting-bracket/output.png
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zuvejN!XW7^lP+Lg(tQ|gs?p@qi-n_OvEQNHRbX#C+<x<YC<y(p@4pk-NK1ab6}PIR
zLp}M<k1C>%PUFE5;^%+Dad>FY2)bUq+EsCFI-5P0@4OLp2`GT0cy!Yxcl2nnG?dyh
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ze6Dn;<oPAiERsZxLyhjg`mB3zph2i%s(I+0Sg%h@CFXwd%aBZdC&DJksVOG1rN~;O
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zOIm9C;_s4jp6kOT%^SgrJwE%OksJCea;#=d^^5JzXaMv30{kd~C@!@X&1YyC39ggR
z!awn#n|Anr5B*OB|FeSsIl}*9!T-YH|1!e=lS#2}ogrCY;ePE`w>~=fPy2|jMuwWz
Gwf_SskDFNl

diff --git a/recipes/README.md b/recipes/README.md
index bc587d7..f0931f4 100644
--- a/recipes/README.md
+++ b/recipes/README.md
@@ -9,7 +9,7 @@ tweak the parameters.
 
 | # | Recipe | Preview | What it shows |
 |---|--------|---------|---------------|
-| 01 | [Mounting bracket](01-mounting-bracket/) | <img src="01-mounting-bracket/output.png" width="160"> | sketch → extrude → `concaveEdges` fillet → drill |
+| 01 | [Mounting bracket](01-mounting-bracket/) | <img src="01-mounting-bracket/output.png" width="160"> | sketch → extrude → geometrically-selected inside-corner fillet → drill |
 | 02 | [Helical compression spring](02-helical-spring/) | <img src="02-helical-spring/output.png" width="160"> | helix path + circular section → pipe sweep |
 | 03 | [Pipe flange](03-pipe-flange/) | <img src="03-pipe-flange/output.png" width="160"> | revolve + `circularPatternCut` bolt circle + chamfer |
 | 04 | [Involute spur gear](04-spur-gear/) | <img src="04-spur-gear/output.png" width="160"> | involute tooth math → polygon → extrude → bore |

From 81a21a9dee16a32f63ffbd6d981dbd0de79a7756 Mon Sep 17 00:00:00 2001
From: gsdali <51393997+gsdali@users.noreply.github.com>
Date: Wed, 5 Aug 2026 09:45:03 +1000
Subject: [PATCH 2/6] fix: remove silent union fallback in recipe 06's fan
 blade

blade = blade.union(hub) ?? blade is the same pattern being fixed in recipe 01
(#105): an optional-returning geometry op degrading silently through `??`
rather than failing loudly. Found while auditing recipes/ for the same shape
of defect per #105.

The union has never actually failed on this recipe's parameters (verified:
identical volume, bounding box, and solidCount before and after this change),
so this is a dormant instance rather than a live bug, but it should fail
loudly if it ever does rather than silently ship a blade missing its hub.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
---
 recipes/06-fan-blade/main.swift | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/recipes/06-fan-blade/main.swift b/recipes/06-fan-blade/main.swift
index 7b7a8a0..8f14930 100644
--- a/recipes/06-fan-blade/main.swift
+++ b/recipes/06-fan-blade/main.swift
@@ -69,7 +69,7 @@ guard var blade = Shape.loft(profiles: profiles, solid: true) else { fatalError(
 let hubR = rootChord * 0.55
 let hub = Shape.cylinder(at: SIMD3(0, 0, -12), direction: SIMD3(0, 0, 1),
                          radius: hubR, height: 14)!
-blade = blade.union(hub) ?? blade
+blade = blade.union(hub)!
 
 try ctx.add(blade, color: C.steel, name: "Fan blade")
 

From 36d2217dd32c71b4a3186b8459bd36ee415456f0 Mon Sep 17 00:00:00 2001
From: gsdali <51393997+gsdali@users.noreply.github.com>
Date: Wed, 5 Aug 2026 09:45:11 +1000
Subject: [PATCH 3/6] docs: record
 concave-edge-classifier-can-select-wrong-edges decision

Two independent recipes have now hit concaveEdges() / convexEdges()
disagreeing with a shape's actual geometry: the pipe flange chamfer (#103,
#104) and now the mounting bracket fillet (#105), where concaveEdges()
returned two unrelated top-cap edges instead of the L-profile's one true
reentrant edge. Worth its own decision rather than a footnote on the existing
revolve-seams entry, since it is no longer a single-shape quirk.

Also records the broader pattern audited in #105: a silent `?? fallback` on a
Shape-returning geometry call is the same defect seen across #100, #103, and
#105, plus one dormant instance found and fixed in recipe 06.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
---
 ...-edge-classifier-can-select-wrong-edges.md | 99 +++++++++++++++++++
 okf/decisions/index.md                        |  3 +
 okf/log.md                                    | 14 +++
 3 files changed, 116 insertions(+)
 create mode 100644 okf/decisions/concave-edge-classifier-can-select-wrong-edges.md

diff --git a/okf/decisions/concave-edge-classifier-can-select-wrong-edges.md b/okf/decisions/concave-edge-classifier-can-select-wrong-edges.md
new file mode 100644
index 0000000..de9de65
--- /dev/null
+++ b/okf/decisions/concave-edge-classifier-can-select-wrong-edges.md
@@ -0,0 +1,99 @@
+---
+type: decision
+title: Shape.concaveEdges() can return the wrong edges entirely, not just a threshold quirk
+description: On an extruded L-profile, concaveEdges() returns two top-cap boundary edges bounded by the leg thickness, not the one true reentrant edge that runs the extrusion length. Select fillet/chamfer edges geometrically instead of trusting the classifier.
+resource: https://github.com/SecondMouseAU/OCCTSwiftScripts/issues/105
+tags: [decision, occtswift, fillet, topology, recipes, edge-selection]
+timestamp: 2026-08-05
+---
+
+# Decision
+
+Do not trust `Shape.concaveEdges()` / `Shape.convexEdges()` to find the edge you mean to
+fillet or chamfer, even when you can name the one edge you expect geometrically. Verify by
+inspecting the returned edges' actual positions, and prefer `Shape.edges(where:)` with an
+explicit geometric predicate once you know what you are looking for.
+
+# Why
+
+Recipe 01's L-bracket profile has exactly one reentrant vertex, at `(thickness, thickness)`.
+Extruded along Z, that vertex produces exactly one concave edge: a line parallel to the
+extrusion axis, running its full length.
+
+`prism.concaveEdges()` does not return that edge. It returns two different edges instead,
+each length `legLength - thickness` (45 mm on the recipe's own parameters), lying in the
+*end cap* plane (`z = width`) rather than running the extrusion axis:
+
+```
+edge[7]  (the true reentrant edge)   isLine, len=40 (=width), bounds x:[5,5] y:[5,5] z:[0,40]  -> classified CONVEX
+edge[9]  (concaveEdges() result #1)  isLine, len=45,           bounds x:[5,50] y:[5,5] z:[40,40] -> classified CONCAVE
+edge[12] (concaveEdges() result #2)  isLine, len=45,           bounds x:[5,5] y:[5,50] z:[40,40] -> classified CONCAVE
+```
+
+`edge[7]` is exactly where the reentrant vertex's profile predicts a concave edge should be.
+It is classified **convex**. The two edges classified concave are boundary segments of the
+top cap, at the far end of the part from where the reentrant corner's own edge runs.
+
+This is not a rounding or threshold problem (`concaveEdges(angle:)`'s default tolerance is
+irrelevant here): the classifier is naming structurally different edges than the geometric
+feature it is supposed to describe.
+
+## Consequence: the wrong edges have the wrong feasible radius
+
+The two edges `concaveEdges()` returns are bounded by the 5 mm leg thickness (they sit on
+the boundary between the end cap and a wall that is only 5 mm across), so filleting them
+fails above roughly that radius. The true edge (`edge[7]`) is bounded only by
+`legLength - thickness` (45 mm here), since it runs along the full unconstrained length of
+each wall. A radius that is completely reasonable for the real feature (8 mm, comfortably
+under 45 mm) reads as infeasible when applied to the wrong edges (over the 5 mm limit), and
+`prism.filleted(edges:radius:)` returns `nil`. That nil, hidden behind a `?? prism`
+fallback, is what recipe 01 shipped for as long as it trusted `concaveEdges()`
+([OCCTSwiftScripts#105](https://github.com/SecondMouseAU/OCCTSwiftScripts/issues/105)).
+
+## A concave fillet adds material; verify the sign, not just a nonzero delta
+
+Filleting the true reentrant edge **increases** the bracket's volume: it fills part of the
+sharp inside corner with a rounded blend. `prism.filleted(edges: [edge7], radius: r).volume`
+is `prism.volume + r² · (1 - π/4) · length`, not minus. Filleting the two edges
+`concaveEdges()` actually returns *removes* material instead, because those two are
+ordinary 90-degree corners from the fillet's point of view (the same
+`r² · (1 - π/4) · length` formula, sign flipped): measured 176.42 mm3 removed at r=3 mm
+across both wrong edges (2 × 45 mm), against 77.26 mm3 that a single correct fillet at r=3
+mm over the 40 mm extrusion length would add. A volume check that only asserts "some
+material moved" would have passed on the wrong edges; the sign and the magnitude both have
+to match the specific edge you intended.
+
+# How to select instead
+
+Once you know the geometric feature you want (here: a line parallel to the extrusion axis,
+positioned at the profile's reentrant vertex), select it directly rather than filtering a
+classifier's output:
+
+```swift
+let insideCorner = prism.edges { edge in
+    guard edge.isLine else { return false }
+    let b = edge.bounds
+    let runsFullWidth = abs((b.max.z - b.min.z) - width) < 1e-6
+        && abs(b.max.x - b.min.x) < 1e-6 && abs(b.max.y - b.min.y) < 1e-6
+    guard runsFullWidth else { return false }
+    return abs(b.min.x - thickness) < 1e-6 && abs(b.min.y - thickness) < 1e-6
+}
+```
+
+# Related
+
+[Revolve seams cannot be chamfered](revolve-seams-cannot-be-chamfered.md) already noted, on
+the pipe flange (#103/#104), that `convexEdges()` / `concaveEdges()` disagreed with what
+chamfering the edges actually did volumetrically. This is the same finding on a second,
+unrelated shape, which is why it is worth its own entry rather than a footnote: two
+independent recipes have now hit a classifier/reality mismatch on `concaveEdges()` and
+`convexEdges()`. Treat both as a hint, to be checked against the shape's actual geometry and
+the operation's actual volumetric effect, not as ground truth.
+
+This is also the third instance of a broader pattern tracked across #100, #103, and #105: an
+optional-returning geometry operation degrades silently via a `?? fallback`, the emitted
+output stays volumetrically plausible, and the docs keep describing the intended behaviour.
+A fourth, dormant instance (`recipes/06-fan-blade`'s `blade.union(hub) ?? blade`, which has
+never actually failed) was fixed alongside #105 once the audit turned it up. Any new
+`Shape`-returning call in a recipe that can return `nil` should fail loudly (force-unwrap or
+an explicit `guard ... else { fatalError(...) }`), never degrade through `??`.
diff --git a/okf/decisions/index.md b/okf/decisions/index.md
index 0e4b881..dbba3b4 100644
--- a/okf/decisions/index.md
+++ b/okf/decisions/index.md
@@ -17,3 +17,6 @@ that need standalone rationale.
   called as `f || status=1` must `return 1` explicitly or its checks are decorative.
 * [Revolve seams cannot be chamfered](revolve-seams-cannot-be-chamfered.md): the all-edge
   `chamfered(distance:)` always fails on a full revolve; select edges explicitly.
+* [Concave edge classifier can select wrong edges](concave-edge-classifier-can-select-wrong-edges.md):
+  `concaveEdges()` returned two unrelated edges instead of an L-bracket's one true reentrant
+  edge; verify a classifier's output geometrically before trusting it.
diff --git a/okf/log.md b/okf/log.md
index 4ef82e8..0624f5c 100644
--- a/okf/log.md
+++ b/okf/log.md
@@ -1,5 +1,19 @@
 # Knowledge Log
 
+## 2026-08-05 (fix/105-bracket-fillet)
+
+* **Update**: Fixed recipe 01's inside-corner fillet, which had never applied (#105).
+  `prism.concaveEdges()` returns the wrong two edges on this shape (top-cap boundary
+  segments bounded by the 5 mm leg thickness), not the one true reentrant edge (bounded
+  only by `legLength - thickness`, 45 mm). `filletRadius = 8` was infeasible for the wrong
+  edges and a `?? prism` fallback hid the resulting `nil`. Now selects the true edge
+  geometrically with `Shape.edges(where:)`; the same `filletRadius = 8` now applies,
+  adding 549.38 mm3 (matches the analytic `r² · (1 - pi/4) · width` prediction exactly).
+  Also fixed `recipes/06-fan-blade`'s `blade.union(hub) ?? blade`, the same pattern found
+  dormant during the `??`-fallback audit #105 requested (the union has never actually
+  failed; behaviour is unchanged).
+* **Creation**: Recorded the concave-edge-classifier-can-select-wrong-edges decision.
+
 ## 2026-08-05
 
 * **Update**: Fixed two cookbook recipes that emitted shells while documenting themselves as

From 39383ba819652a0baaa7689c507e83c7c40b6935 Mon Sep 17 00:00:00 2001
From: gsdali <51393997+gsdali@users.noreply.github.com>
Date: Wed, 5 Aug 2026 16:34:39 +1000
Subject: [PATCH 4/6] docs: scope the concaveEdges workaround to OCCTSwift 1.x

The classifier defect this PR works around is fixed in the 2.0.0 line. Verified
against the published v2.0.0-kernel.1 prerelease with the same repro:

  1.17.0          L-prism concave=2 (expected 1)  insideCorner inConcave=false
  2.0.0-kernel.1  L-prism concave=1 (expected 1)  insideCorner inConcave=true

A T-prism with two reentrant edges reports 3 on 1.17.0 and 2 on 2.0.0-kernel.1.
A box, having no reentrant edges, is correct on both. The fix was too involved to
backport to 1.x, so it is carried by the 2.0.0 refactor.

No code change: the geometric selection stays, because this package is pinned to
1.17.0 and the defect is real there. What changes is that the workaround is now
recorded as temporary rather than permanent, in the OKF entry and in the recipe
header, so whoever migrates to 2.0.0 knows this can be simplified back to
concaveEdges() and knows to re-run the repro rather than assume.

Also corrected the upstream report, OCCTSwift#695, which claimed the bug was
verified at 2.0.0-kernel.1. It was not: only the 1.17.0 run was the classifier
repro, and at 2.0.0-kernel.1 the case passes.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
---
 ...-edge-classifier-can-select-wrong-edges.md | 28 +++++++++++++++++--
 recipes/01-mounting-bracket/main.swift        |  4 +++
 2 files changed, 29 insertions(+), 3 deletions(-)

diff --git a/okf/decisions/concave-edge-classifier-can-select-wrong-edges.md b/okf/decisions/concave-edge-classifier-can-select-wrong-edges.md
index de9de65..004ef7b 100644
--- a/okf/decisions/concave-edge-classifier-can-select-wrong-edges.md
+++ b/okf/decisions/concave-edge-classifier-can-select-wrong-edges.md
@@ -1,7 +1,7 @@
 ---
 type: decision
 title: Shape.concaveEdges() can return the wrong edges entirely, not just a threshold quirk
-description: On an extruded L-profile, concaveEdges() returns two top-cap boundary edges bounded by the leg thickness, not the one true reentrant edge that runs the extrusion length. Select fillet/chamfer edges geometrically instead of trusting the classifier.
+description: On OCCTSwift 1.x, concaveEdges() on an extruded L-profile returns two top-cap boundary edges rather than the one true reentrant edge, and classifies that edge convex. Fixed in the 2.0.0 line. Select fillet/chamfer edges geometrically while on 1.x.
 resource: https://github.com/SecondMouseAU/OCCTSwiftScripts/issues/105
 tags: [decision, occtswift, fillet, topology, recipes, edge-selection]
 timestamp: 2026-08-05
@@ -9,11 +9,33 @@ timestamp: 2026-08-05
 
 # Decision
 
-Do not trust `Shape.concaveEdges()` / `Shape.convexEdges()` to find the edge you mean to
-fillet or chamfer, even when you can name the one edge you expect geometrically. Verify by
+On the OCCTSwift 1.x line, do not trust `Shape.concaveEdges()` / `Shape.convexEdges()` to
+find the edge you mean to fillet or chamfer, even when you can name the one edge you expect
+geometrically. Verify by
 inspecting the returned edges' actual positions, and prefer `Shape.edges(where:)` with an
 explicit geometric predicate once you know what you are looking for.
 
+# Version scope: 1.x only, fixed in 2.0.0
+
+This is an **OCCTSwift 1.x defect**. It is already fixed in the 2.0.0 line, verified against the
+published `v2.0.0-kernel.1` prerelease with the same repro:
+
+```
+1.17.0          L-prism concave=2 (expected 1)   insideCorner inConcave=false   MISMATCH
+2.0.0-kernel.1  L-prism concave=1 (expected 1)   insideCorner inConcave=true    OK
+```
+
+A T-prism with two reentrant edges reports 3 on 1.17.0 and 2 on 2.0.0-kernel.1. A box, having no
+reentrant edges, is correct on both.
+
+The fix was too involved to backport to the 1.x line, so it is carried by the 2.0.0 refactor.
+Raised upstream as [OCCTSwift#695](https://github.com/SecondMouseAU/OCCTSwift/issues/695).
+
+**So the geometric selection below is a 1.x workaround with a known end date.** When this repo
+moves to the 2.0.0 line, `concaveEdges()` becomes usable for this case again, and recipe 01 could
+return to it. That would be a legitimate simplification rather than a regression. Re-run the
+repro above before relying on it, rather than assuming the migration carried the fix.
+
 # Why
 
 Recipe 01's L-bracket profile has exactly one reentrant vertex, at `(thickness, thickness)`.
diff --git a/recipes/01-mounting-bracket/main.swift b/recipes/01-mounting-bracket/main.swift
index 49a4409..e15afd9 100644
--- a/recipes/01-mounting-bracket/main.swift
+++ b/recipes/01-mounting-bracket/main.swift
@@ -53,6 +53,10 @@ let prism = Shape.extrude(profile: lProfile, direction: SIMD3(0, 0, 1), length:
 // The inside corner is the one straight edge parallel to the extrusion axis (Z) that
 // sits at (thickness, thickness): select it geometrically rather than trusting
 // concaveEdges(), which picks the wrong edges on this shape (see the header note).
+// That classifier defect is OCCTSwift 1.x only: it is fixed in the 2.0.0 line
+// (verified on v2.0.0-kernel.1, upstream OCCTSwift#695). This geometric selection is
+// therefore a 1.x workaround, and this recipe could return to concaveEdges() once the
+// package moves to 2.0.0. Re-run the check in the OKF entry before doing so.
 let insideCorner = prism.edges { edge in
     guard edge.isLine else { return false }
     let b = edge.bounds

From 490b9588865e3dc0d4470ac1d610544f6d5d798b Mon Sep 17 00:00:00 2001
From: gsdali <51393997+gsdali@users.noreply.github.com>
Date: Wed, 5 Aug 2026 17:29:46 +1000
Subject: [PATCH 5/6] fix: guard the inside-corner selector, and pluralise its
 name (#106 review)

Adds `precondition(!insideCornerEdges.isEmpty, ...)` before the fillet, and
renames `insideCorner` to `insideCornerEdges` since it holds a collection, for
consistency with recipe 03's `chamferTargets`.

On the review's uncertainty about whether an empty edge list no-ops: it does not.
`filleted(edges: [], radius:)` returns nil on both 1.17.0 and 2.0.0-kernel.1, so
the existing force-unwrap would already have caught an empty match. The guard is
still worth having for two reasons the measurement does not remove: it names the
actual fault instead of surfacing an anonymous nil-unwrap crash, and it stops the
recipe depending on undocumented nil-on-empty behaviour that a future upstream
change could alter.

Verified the guard fires rather than being decorative: breaking the predicate so
it matches nothing gives

  Script/main.swift:73: Precondition failed: inside-corner edge selector matched nothing

and the recipe returns 18779.69 once restored. All 7 recipes pass, policy-check
and verb-check clean.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
---
 recipes/01-mounting-bracket/main.swift | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/recipes/01-mounting-bracket/main.swift b/recipes/01-mounting-bracket/main.swift
index e15afd9..f5b7594 100644
--- a/recipes/01-mounting-bracket/main.swift
+++ b/recipes/01-mounting-bracket/main.swift
@@ -57,7 +57,7 @@ let prism = Shape.extrude(profile: lProfile, direction: SIMD3(0, 0, 1), length:
 // (verified on v2.0.0-kernel.1, upstream OCCTSwift#695). This geometric selection is
 // therefore a 1.x workaround, and this recipe could return to concaveEdges() once the
 // package moves to 2.0.0. Re-run the check in the OKF entry before doing so.
-let insideCorner = prism.edges { edge in
+let insideCornerEdges = prism.edges { edge in
     guard edge.isLine else { return false }
     let b = edge.bounds
     let runsFullWidth = abs((b.max.z - b.min.z) - width) < 1e-6
@@ -65,7 +65,13 @@ let insideCorner = prism.edges { edge in
     guard runsFullWidth else { return false }
     return abs(b.min.x - thickness) < 1e-6 && abs(b.min.y - thickness) < 1e-6
 }
-var bracket = prism.filleted(edges: insideCorner, radius: filletRadius)!
+// Guard the selector separately from the fillet. `filleted(edges: [], radius:)` does
+// return nil today (checked on both 1.17.0 and 2.0.0-kernel.1), so the force-unwrap
+// below would catch an empty match, but only as an anonymous nil-unwrap crash. This
+// names the actual fault, and avoids depending on undocumented nil-on-empty behaviour
+// if a parameter change or an upstream tweak ever silently breaks the predicate.
+precondition(!insideCornerEdges.isEmpty, "inside-corner edge selector matched nothing")
+var bracket = prism.filleted(edges: insideCornerEdges, radius: filletRadius)!
 
 // ── Four through-holes: two in the base leg (drill along Y), two in the upright
 //    leg (drill along X). Start just outside the entry face and over-run the exit.

From cac27c37737dc931a66fa6d0e401c943346ed6da Mon Sep 17 00:00:00 2001
From: gsdali <51393997+gsdali@users.noreply.github.com>
Date: Wed, 5 Aug 2026 19:00:10 +1000
Subject: [PATCH 6/6] style: use guard/fatalError for the selector check,
 matching the recipes

The recipes already have a "crash loudly" idiom and it is not precondition:
recipes 04, 06 and 07 use guard ... else { fatalError(...) } or a bare
fatalError, four uses in total. The precondition added in 490b958 was the only
one of its kind, so this switches it for consistency.

Also strictly safer, not just tidier: fatalError is never elided, while
precondition is removed under -Ounchecked. Nothing here builds with that today,
but the guard's whole value is firing when it is needed.

Verified the guard still fires after the change:

  Script/main.swift:73: Fatal error: inside-corner edge selector matched nothing

and the recipe returns 18779.69 once restored. All 7 recipes pass, policy-check
clean.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
---
 recipes/01-mounting-bracket/main.swift | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/recipes/01-mounting-bracket/main.swift b/recipes/01-mounting-bracket/main.swift
index f5b7594..ebf3cbc 100644
--- a/recipes/01-mounting-bracket/main.swift
+++ b/recipes/01-mounting-bracket/main.swift
@@ -70,7 +70,7 @@ let insideCornerEdges = prism.edges { edge in
 // below would catch an empty match, but only as an anonymous nil-unwrap crash. This
 // names the actual fault, and avoids depending on undocumented nil-on-empty behaviour
 // if a parameter change or an upstream tweak ever silently breaks the predicate.
-precondition(!insideCornerEdges.isEmpty, "inside-corner edge selector matched nothing")
+guard !insideCornerEdges.isEmpty else { fatalError("inside-corner edge selector matched nothing") }
 var bracket = prism.filleted(edges: insideCornerEdges, radius: filletRadius)!
 
 // ── Four through-holes: two in the base leg (drill along Y), two in the upright