From 80617627c15406a548db1c981db5e22059ad6a72 Mon Sep 17 00:00:00 2001
From: asp <128797936+ASP-SuperExplorer@users.noreply.github.com>
Date: Fri, 11 Sep 2026 23:28:26 +0800
Subject: [PATCH 1/2] Fix parametricCurve default smoothing

---
 cadquery/cq.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/cadquery/cq.py b/cadquery/cq.py
index 8d5a4cd25..67493021f 100644
--- a/cadquery/cq.py
+++ b/cadquery/cq.py
@@ -1945,7 +1945,7 @@ def parametricCurve(
         tol: float = 1e-6,
         minDeg: int = 1,
         maxDeg: int = 6,
-        smoothing: Optional[Tuple[float, float, float]] = (1, 1, 1),
+        smoothing: Optional[Tuple[float, float, float]] = None,
         makeWire: bool = True,
     ) -> T:
         """
@@ -1959,7 +1959,7 @@ def parametricCurve(
         :param tol: tolerance of the algorithm (default: 1e-6)
         :param minDeg: minimum spline degree (default: 1)
         :param maxDeg: maximum spline degree (default: 6)
-        :param smoothing: optional parameters for the variational smoothing algorithm (default: (1,1,1))
+        :param smoothing: optional parameters for the variational smoothing algorithm (default: None)
         :param makeWire: convert the resulting spline edge to a wire
         :return: a Workplane object with the current point unchanged
 

From 252c4f7fbeca47465507b27e5f5f32ceab640294 Mon Sep 17 00:00:00 2001
From: asp <128797936+ASP-SuperExplorer@users.noreply.github.com>
Date: Fri, 11 Sep 2026 23:28:35 +0800
Subject: [PATCH 2/2] Add regression test for parametric helix

---
 tests/test_cadquery.py | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/tests/test_cadquery.py b/tests/test_cadquery.py
index a1de3c957..f90af3861 100644
--- a/tests/test_cadquery.py
+++ b/tests/test_cadquery.py
@@ -3996,6 +3996,24 @@ def testParametricCurve(self):
         self.assertEqual(len(res_edge.ctx.pendingEdges), 1)
         self.assertEqual(len(res_edge.ctx.pendingWires), 0)
 
+    def testParametricCurveHelixIntegerTurns(self):
+        def func(t):
+            return (
+                math.cos(t * math.pi * 2),
+                math.sin(t * math.pi * 2),
+                t,
+            )
+
+        res = Workplane("XY").parametricCurve(func, stop=4)
+        edge = res.val().Edges()[0]
+        points = [edge.positionAt(i / 50) for i in range(51)]
+        radii = [math.sqrt(p.x**2 + p.y**2) for p in points]
+
+        self.assertAlmostEqual(edge.startPoint().x, 1, 6)
+        self.assertAlmostEqual(edge.endPoint().x, 1, 6)
+        self.assertAlmostEqual(edge.endPoint().z, 4, 6)
+        self.assertLess(max(abs(r - 1) for r in radii), 1e-4)
+
     def testMakeShellSolid(self):
 
         c0 = math.sqrt(2) / 4