From f46999b9f4ca107c00158ed094e3e6a07d5eb774 Mon Sep 17 00:00:00 2001
From: Enrico Turri <34307919+enricoturri1966@users.noreply.github.com>
Date: Wed, 26 Mar 2025 13:20:23 +0100
Subject: [PATCH] SPE-2728 - Fixed measurement of distance between
 parallel-aligned circles (#14360)

---
 src/libslic3r/Measure.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/libslic3r/Measure.cpp b/src/libslic3r/Measure.cpp
index db235e6980..3c876b0fff 100644
--- a/src/libslic3r/Measure.cpp
+++ b/src/libslic3r/Measure.cpp
@@ -1133,7 +1133,7 @@ MeasurementResult get_measurement(const SurfaceFeature& a, const SurfaceFeature&
             else {
                 ClosestInfo& info = candidates[0];
             
-                const double N0dD = n0.dot(D);
+                double N0dD = n0.dot(D);
                 const Vec3d normProj = N0dD * n0;
                 const Vec3d compProj = D - normProj;
                 Vec3d U = compProj;
@@ -1194,6 +1194,7 @@ MeasurementResult get_measurement(const SurfaceFeature& a, const SurfaceFeature&
                         distance = (c1 - c0).norm();
                         info.circle0Closest = c0;
                         info.circle1Closest = c1;
+                        N0dD = 0.0;
                     }
                 }