diff --git a/src/slic3r/GUI/3DScene.cpp b/src/slic3r/GUI/3DScene.cpp
index 29fb765e6..e4e435414 100644
--- a/src/slic3r/GUI/3DScene.cpp
+++ b/src/slic3r/GUI/3DScene.cpp
@@ -89,29 +89,16 @@ std::vector<std::array<float, 4>> get_extruders_colors()
 }
 float FullyTransparentMaterialThreshold  = 0.1f;
 float FullTransparentModdifiedToFixAlpha = 0.3f;
-std::array<float, 4> adjust_color_for_rendering(const std::array<float, 4> &colors, int whichView)
+std::array<float, 4> adjust_color_for_rendering(const std::array<float, 4> &colors)
 {
-    if (whichView == (int) Slic3r::GUI::GLCanvas3D::ECanvasType::CanvasView3D ||
-        whichView == (int) Slic3r::GUI::GLCanvas3D::ECanvasType::CanvasAssembleView) { 
-        if (colors[3] < FullyTransparentMaterialThreshold) { // completely transparent
+   if (colors[3] < FullyTransparentMaterialThreshold) { // completely transparent
                 std::array<float, 4> new_color;
                 new_color[0] = 1;
                 new_color[1] = 1;
                 new_color[2] = 1;
                 new_color[3] = FullTransparentModdifiedToFixAlpha;
                 return new_color;
-            }
-    } else {
-        if (colors[3] < FullyTransparentMaterialThreshold) { // completely transparent
-            std::array<float, 4> new_color;
-            new_color[0] = 1;
-            new_color[1] = 1;
-            new_color[2] = 1;
-            new_color[3] = 0.05f;
-            return new_color;
-        }
-    }
-
+    } 
     return colors;
 }
 
diff --git a/src/slic3r/GUI/3DScene.hpp b/src/slic3r/GUI/3DScene.hpp
index fa599e61f..4547b5ca5 100644
--- a/src/slic3r/GUI/3DScene.hpp
+++ b/src/slic3r/GUI/3DScene.hpp
@@ -33,7 +33,7 @@
 extern std::vector<std::array<float, 4>> get_extruders_colors();
 extern float FullyTransparentMaterialThreshold;
 extern float FullTransparentModdifiedToFixAlpha;
-extern std::array<float, 4>              adjust_color_for_rendering(const std::array<float, 4> &colors, int whichView=0);
+extern std::array<float, 4>    adjust_color_for_rendering(const std::array<float, 4> &colors);
 
 
 namespace Slic3r {
diff --git a/src/slic3r/GUI/GCodeViewer.cpp b/src/slic3r/GUI/GCodeViewer.cpp
index f7e2f541b..c8a0b6ecd 100644
--- a/src/slic3r/GUI/GCodeViewer.cpp
+++ b/src/slic3r/GUI/GCodeViewer.cpp
@@ -1153,7 +1153,7 @@ void GCodeViewer::refresh(const GCodeProcessorResult& gcode_result, const std::v
     }
 
     for (int i = 0; i < m_tools.m_tool_colors.size(); i++) {
-        m_tools.m_tool_colors[i] = adjust_color_for_rendering(m_tools.m_tool_colors[i],  GLCanvas3D::ECanvasType::CanvasPreview);
+        m_tools.m_tool_colors[i] = adjust_color_for_rendering(m_tools.m_tool_colors[i]);
     }
     // ensure there are enough colors defined
     while (m_tools.m_tool_colors.size() < std::max(size_t(1), gcode_result.extruders_count)) {
@@ -3266,7 +3266,7 @@ void GCodeViewer::refresh_render_paths(bool keep_sequential_current_first, bool
                 color = { 0.5f, 0.5f, 0.5f, 1.0f };
             else {
                 color = m_tools.m_tool_colors[path.cp_color_id];
-                color = adjust_color_for_rendering(color, GLCanvas3D::ECanvasType::CanvasPreview);
+                color = adjust_color_for_rendering(color);
             }
             break;
         }
@@ -3876,10 +3876,6 @@ void GCodeViewer::render_toolpaths()
     ](std::vector<RenderPath>::reverse_iterator it_path, std::vector<RenderPath>::reverse_iterator it_end, GLShaderProgram& shader, int uniform_color) {
         for (auto it = it_path; it != it_end && it_path->ibuffer_id == it->ibuffer_id; ++it) {
             const RenderPath& path = *it;
-            if (path.color[3] < 1.0) {
-                glsafe(::glEnable(GL_BLEND));
-                glsafe(::glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA));
-            }
             // Some OpenGL drivers crash on empty glMultiDrawElements, see GH #7415.
             assert(! path.sizes.empty());
             assert(! path.offsets.empty());
@@ -3888,9 +3884,6 @@ void GCodeViewer::render_toolpaths()
 #if ENABLE_GCODE_VIEWER_STATISTICS
             ++m_statistics.gl_multi_triangles_calls_count;
 #endif // ENABLE_GCODE_VIEWER_STATISTICS
-            if (path.color[3] < 1.0) {
-                glsafe(::glDisable(GL_BLEND));
-            }
         }
     };
 
@@ -4170,7 +4163,7 @@ void GCodeViewer::render_all_plates_stats(const std::vector<const GCodeProcessor
     std::vector<Color> filament_colors = decode_colors(wxGetApp().plater()->get_extruder_colors_from_plater_config(gcode_result_list.back()));
 
     for (int i = 0; i < filament_colors.size(); i++) { 
-        filament_colors[i] = adjust_color_for_rendering(filament_colors[i], GLCanvas3D::ECanvasType::CanvasPreview);
+        filament_colors[i] = adjust_color_for_rendering(filament_colors[i]);
     }
 
     bool imperial_units = wxGetApp().app_config->get("use_inches") == "1";
diff --git a/src/slic3r/GUI/GCodeViewer.hpp b/src/slic3r/GUI/GCodeViewer.hpp
index d09c38d59..a6f5b6722 100644
--- a/src/slic3r/GUI/GCodeViewer.hpp
+++ b/src/slic3r/GUI/GCodeViewer.hpp
@@ -734,13 +734,6 @@ public:
 
     //BBS
     ConflictResultOpt m_conflict_result;
-    bool   GetGcodeGenOk()
-    {
-        if (m_roles.empty())
-            return false;
-        else
-            return true;
-    }
 private:
     std::vector<int> m_plater_extruder;
     bool m_gl_data_initialized{ false };
diff --git a/src/slic3r/GUI/GLCanvas3D.cpp b/src/slic3r/GUI/GLCanvas3D.cpp
index e4f1cdfd1..eb0a4440e 100644
--- a/src/slic3r/GUI/GLCanvas3D.cpp
+++ b/src/slic3r/GUI/GLCanvas3D.cpp
@@ -1899,10 +1899,6 @@ void GLCanvas3D::render(bool only_init)
         _render_selection();
         _render_bed(!camera.is_looking_downward(), show_axes);
         _render_platelist(!camera.is_looking_downward(), only_current, true, hover_id);
-        // BBS: add outline logic
-        if (m_gcode_viewer.GetGcodeGenOk()==false) { 
-            _render_objects(GLVolumeCollection::ERenderType::Transparent, !m_gizmos.is_running());
-        }
         // BBS: GUI refactor: add canvas size as parameters
         _render_gcode(cnv_size.get_width(), cnv_size.get_height());
     }