From 2d185d82b81262702d819aa7fb78e95efec26f9b Mon Sep 17 00:00:00 2001
From: Noisyfox <timemanager.rick@gmail.com>
Date: Sun, 15 Oct 2023 22:04:55 +0800
Subject: [PATCH] Support a special case that treat every layer as steep
 overhang

---
 src/libslic3r/PerimeterGenerator.cpp | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/libslic3r/PerimeterGenerator.cpp b/src/libslic3r/PerimeterGenerator.cpp
index ce0bcc73e60..890d6378985 100644
--- a/src/libslic3r/PerimeterGenerator.cpp
+++ b/src/libslic3r/PerimeterGenerator.cpp
@@ -229,6 +229,17 @@ static bool detect_steep_overhang(bool               is_contour,
                                   bool              &steep_overhang_contour,
                                   bool              &steep_overhang_hole)
 {
+    // Special case: reverse on every odd layer
+    if (overhang_steep_width < EPSILON) {
+        if (is_contour) {
+            steep_overhang_contour = true;
+        } else {
+            steep_overhang_hole = true;
+        }
+
+        return true;
+    }
+
     Polygons lower_slcier_chopped = ClipperUtils::clip_clipper_polygons_with_subject_bbox(*lower_slices, extrusion_bboxs, true);
 
     // All we need to check is whether we have lines outside `overhang_steep_width`