From b965d420cf1ccbf3feed5453fb55c1b00ee14b20 Mon Sep 17 00:00:00 2001
From: Arthur <arthur.tang@bambulab.com>
Date: Thu, 24 Apr 2025 17:27:51 +0800
Subject: [PATCH] ENH: do not reverse wipe for supports

This might help improve the quality and strength of supports.

jira: STUDIO-11985
Change-Id: I51644c84b9ede018a08a0f2b8fdca5d271d69991
(cherry picked from commit ba5dbc544b65276d772834305fcca6b5f7536d6e)
---
 src/libslic3r/GCode.cpp | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/src/libslic3r/GCode.cpp b/src/libslic3r/GCode.cpp
index f65b8ab93d..34806b89a5 100644
--- a/src/libslic3r/GCode.cpp
+++ b/src/libslic3r/GCode.cpp
@@ -5480,8 +5480,20 @@ std::string GCode::extrude_path(ExtrusionPath path, std::string description, dou
     //    description += ExtrusionEntity::role_to_string(path.role());
     std::string gcode = this->_extrude(path, description, speed);
     if (m_wipe.enable && FILAMENT_CONFIG(wipe)) {
-        m_wipe.path = std::move(path.polyline);
-        m_wipe.path.reverse();
+        m_wipe.path = path.polyline;
+        if (is_tree(this->config().support_type) && (path.role() == erSupportMaterial || path.role() == erSupportMaterialInterface || path.role() == erSupportTransition)) {
+            if ((m_wipe.path.first_point() - m_wipe.path.last_point()).cast<double>().norm() > scale_(0.2)) {
+                double min_dist = scale_(0.2);
+                int    i        = 0;
+                for (; i < path.polyline.points.size(); i++) {
+                    double dist = (path.polyline.points[i] - path.last_point()).cast<double>().norm();
+                    if (dist < min_dist) min_dist = dist;
+                    if (min_dist < scale_(0.2) && dist > min_dist) break;
+                }
+                m_wipe.path = Polyline(Points(path.polyline.points.begin() + i - 1, path.polyline.points.end()));
+            }
+        } else
+            m_wipe.path.reverse();
     }
 
     return gcode;