From 6baf01d0e54186171c00ded25d67895bab2a44d8 Mon Sep 17 00:00:00 2001
From: RF47 <162915171+RF47@users.noreply.github.com>
Date: Sun, 17 May 2026 17:45:06 -0300
Subject: [PATCH] phong in preview mode

---
 src/slic3r/GUI/GCodeViewer.cpp | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/src/slic3r/GUI/GCodeViewer.cpp b/src/slic3r/GUI/GCodeViewer.cpp
index 01635e85b8..23f889337d 100644
--- a/src/slic3r/GUI/GCodeViewer.cpp
+++ b/src/slic3r/GUI/GCodeViewer.cpp
@@ -6,6 +6,7 @@
 #include "libslic3r/Print.hpp"
 #include "libslic3r/Geometry.hpp"
 #include "libslic3r/Model.hpp"
+#include "libslic3r/AppConfig.hpp"
 #include "libslic3r/Utils.hpp"
 #include "libslic3r/LocalesUtils.hpp"
 #include "libslic3r/PresetBundle.hpp"
@@ -222,7 +223,11 @@ void GCodeViewer::SequentialView::Marker::render(int canvas_width, int canvas_he
     if (!m_visible)
         return;
 
-    GLShaderProgram* shader = wxGetApp().get_shader("gouraud_light");
+    const bool reflections = wxGetApp().app_config != nullptr &&
+        wxGetApp().app_config->get(SETTING_OPENGL_SHADING_MODEL) == "phong";
+    GLShaderProgram* shader = wxGetApp().get_shader(reflections ? "phong" : "gouraud_light");
+    if (shader == nullptr)
+        shader = wxGetApp().get_shader("gouraud_light");
     if (shader == nullptr)
         return;
 
@@ -2414,7 +2419,11 @@ void GCodeViewer::render_shells(int canvas_width, int canvas_height)
         //if (!m_shells.visible || m_shells.volumes.empty())
         return;
 
-    GLShaderProgram* shader = wxGetApp().get_shader("gouraud_light");
+    const bool reflections = wxGetApp().app_config != nullptr &&
+        wxGetApp().app_config->get(SETTING_OPENGL_SHADING_MODEL) == "phong";
+    GLShaderProgram* shader = wxGetApp().get_shader(reflections ? "phong" : "gouraud_light");
+    if (shader == nullptr)
+        shader = wxGetApp().get_shader("gouraud_light");
     if (shader == nullptr)
         return;