From d27889eb0f4bf99a5afd959cc0e14a048ac6d058 Mon Sep 17 00:00:00 2001
From: Rodrigo Faselli <162915171+RF47@users.noreply.github.com>
Date: Mon, 6 Apr 2026 15:29:23 -0300
Subject: [PATCH] Fix fuzzy skin regresion classic wall generator (#12920)

Co-authored-by: Ian Bassi <12130714+ianalexis@users.noreply.github.com>
---
 src/libslic3r/Feature/FuzzySkin/FuzzySkin.cpp | 33 ++++++++-----------
 1 file changed, 13 insertions(+), 20 deletions(-)

diff --git a/src/libslic3r/Feature/FuzzySkin/FuzzySkin.cpp b/src/libslic3r/Feature/FuzzySkin/FuzzySkin.cpp
index fb9ea23822..812f9f9d14 100644
--- a/src/libslic3r/Feature/FuzzySkin/FuzzySkin.cpp
+++ b/src/libslic3r/Feature/FuzzySkin/FuzzySkin.cpp
@@ -285,7 +285,7 @@ Polygon apply_fuzzy_skin(const Polygon& polygon, const PerimeterGenerator& perim
     // Split the loops into lines with different config, and fuzzy them separately
     fuzzified = polygon;
     for (const auto& r : fuzzified_regions) {
-        const auto splitted = Algorithm::split_line(fuzzified, r.second, true);
+        auto splitted = Algorithm::split_line(fuzzified, r.second, true);
         if (splitted.empty()) {
             // No intersection, skip
             continue;
@@ -296,26 +296,24 @@ Polygon apply_fuzzy_skin(const Polygon& polygon, const PerimeterGenerator& perim
             // The entire polygon is fuzzified
             fuzzy_polyline(fuzzified.points, true, slice_z, r.first);
         } else {
+            // Start from a non-clipped junction so wrapped clipped segments do
+            // not need an artificial reconnection across the seam.
+            const auto first_non_clipped = std::find_if(splitted.begin(), splitted.end(), [](const Algorithm::SplitLineJunction& j) {
+                return !j.clipped;
+            });
+            if (first_non_clipped != splitted.begin()) {
+                std::rotate(splitted.begin(), first_non_clipped, splitted.end());
+            }
             Points segment;
             segment.reserve(splitted.size());
             fuzzified.points.clear();
 
             const auto fuzzy_current_segment = [&segment, &fuzzified, &r, slice_z]() {
-                // Orca: non fuzzy points to isolate fuzzy region
-                const auto front = segment.front();
-                const auto back  = segment.back();
- 
+                fuzzified.points.push_back(segment.front());
+                const auto back = segment.back();
                 fuzzy_polyline(segment, false, slice_z, r.first);
-                //Orca: only add non fuzzy point if it's not in the polygon closing point.
-                if (!fuzzified.points.empty()
-                    && fuzzified.points.back() != front) {
-                    fuzzified.points.push_back(front);
-                }
                 fuzzified.points.insert(fuzzified.points.end(), segment.begin(), segment.end());
-                //Orca: only add non fuzzy point if it's not in the polygon closing point.
-                if (!fuzzified.points.empty() && fuzzified.points.back() != front) {
-                    fuzzified.points.push_back(back);
-                }
+                fuzzified.points.push_back(back);
                 segment.clear();
             };
 
@@ -338,12 +336,7 @@ Polygon apply_fuzzy_skin(const Polygon& polygon, const PerimeterGenerator& perim
             }
         }
     }
- 
-    // Orca: ensure the loop is closed after fuzzification 
-    if (!fuzzified.points.empty() && fuzzified.points.front() != fuzzified.points.back()) {
-        fuzzified.points.back() = fuzzified.points.front();
-    }
- 
+
     return fuzzified;
 }