Dim lower layers (#14705)

src/libslic3r/AppConfig.cpp

@@ -202,6 +202,10 @@ void AppConfig::set_defaults()
     if (get("seq_top_layer_only").empty())
         set("seq_top_layer_only", "1");
 
+    // ORCA: darken layers below the current one while scrubbing the preview (ported from preFlight)
+    if (get("preview_dim_previous_layers").empty())
+        set_bool("preview_dim_previous_layers", false);
+
     if (get("filaments_area_preferred_count").empty())
         set("filaments_area_preferred_count", "10");
 

src/libvgcode/include/Viewer.hpp

@@ -91,6 +91,13 @@ public:
     //
     void toggle_top_layer_only_view_range();
     //
+    // Dim previous layers (ORCA, ported from preFlight)
+    // Whether the layers below the current top layer are rendered darkened while
+    // scrubbing below the full print, so only the current layer is shown at full brightness.
+    //
+    bool is_dim_previous_layers() const;
+    void set_dim_previous_layers(bool value);
+    //
     // Returns true if the given option is visible.
     //
     bool is_option_visible(EOptionType type) const;

src/libvgcode/src/Settings.hpp

@@ -19,6 +19,9 @@ struct Settings
 		EViewType view_type{ EViewType::FeatureType };
 		ETimeMode time_mode{ ETimeMode::Normal };
 		bool top_layer_only_view_range{ false };
+		// ORCA: when enabled, all layers below the current top layer are rendered
+		// darkened (keeping their color) while scrubbing below the full print (ported from preFlight)
+		bool dim_previous_layers{ false };
 		bool spiral_vase_mode{ false };
 		//
 		// Required update flags

src/libvgcode/src/Viewer.cpp

@@ -72,6 +72,16 @@ void Viewer::toggle_top_layer_only_view_range()
     m_impl->toggle_top_layer_only_view_range();
 }
 
+bool Viewer::is_dim_previous_layers() const
+{
+    return m_impl->is_dim_previous_layers();
+}
+
+void Viewer::set_dim_previous_layers(bool value)
+{
+    m_impl->set_dim_previous_layers(value);
+}
+
 bool Viewer::is_option_visible(EOptionType type) const
 {
     return m_impl->is_option_visible(type);

src/libvgcode/src/ViewerImpl.cpp

@@ -1223,6 +1223,20 @@ static float encode_color(const Color& color) {
     return static_cast<float>(i_color);
 }
 
+// ORCA: how much the layers below the current top layer are darkened when
+// Settings::dim_previous_layers is enabled (ported from preFlight). 0.0 = no change, 1.0 = black.
+static constexpr float PREVIOUS_LAYER_DARKEN_FACTOR = 0.60f;
+
+// ORCA: returns the encoded color scaled towards black by 'factor', preserving its hue
+static float encode_color_darkened(const Color& color, float factor) {
+    const float keep = 1.0f - factor;
+    const int r = static_cast<int>(color[0] * keep);
+    const int g = static_cast<int>(color[1] * keep);
+    const int b = static_cast<int>(color[2] * keep);
+    const int i_color = r << 16 | g << 8 | b;
+    return static_cast<float>(i_color);
+}
+
 
 void ViewerImpl::update_colors_texture()
 {
@@ -1234,14 +1248,30 @@ void ViewerImpl::update_colors_texture()
     const size_t top_layer_id = m_settings.top_layer_only_view_range ? m_layers.get_view_range()[1] : 0;
     const bool color_top_layer_only = m_view_range.get_full()[1] != m_view_range.get_visible()[1];
 
+    // ORCA: when dim_previous_layers is enabled, darken every layer below the current top layer
+    // (keeping its color) whenever we are not rendering the whole print, so that only the layer
+    // being scrubbed to is shown at full brightness (ported from preFlight). This shares
+    // top_layer_id with the greying path, so it only applies while in top-layer-only mode - that
+    // way the moves slider still animates normally across all layers when that mode is disabled.
+    const bool dim_previous_layers = m_settings.dim_previous_layers && !m_layers.empty();
+    const bool full_render = (m_layers.get_view_range()[0] == 0) &&
+                             (m_layers.get_view_range()[1] >= static_cast<uint32_t>(m_layers.count()) - 1) &&
+                             (m_view_range.get_visible()[1] == m_view_range.get_full()[1]);
+
     // Based on current settings and slider position, we might want to render some
-    // vertices as dark grey. Use either that or the normal color (from the cache).
+    // vertices as dark grey (or darkened, see above). Use either that or the normal color (from the cache).
     std::vector<float> colors(m_vertices_colors.size());
     assert(colors.size() == m_vertices.size() && m_vertices_colors.size() == m_vertices.size());
-    for (size_t i=0; i<m_vertices.size(); ++i)
+    for (size_t i=0; i<m_vertices.size(); ++i) {
-        colors[i] = (color_top_layer_only && m_vertices[i].layer_id < top_layer_id &&
+        const PathVertex& v = m_vertices[i];
-                    (!m_settings.spiral_vase_mode || i != m_view_range.get_enabled()[0])) ?
+        const bool keep_spiral_seam = m_settings.spiral_vase_mode && i == m_view_range.get_enabled()[0];
-                    encode_color(DUMMY_COLOR) : m_vertices_colors[i];
+        if (dim_previous_layers && !full_render && v.layer_id < top_layer_id && !keep_spiral_seam)
+            colors[i] = encode_color_darkened(get_vertex_color(v), PREVIOUS_LAYER_DARKEN_FACTOR);
+        else if (color_top_layer_only && v.layer_id < top_layer_id && !keep_spiral_seam)
+            colors[i] = encode_color(DUMMY_COLOR);
+        else
+            colors[i] = m_vertices_colors[i];
+    }
 
     #ifdef ENABLE_OPENGL_ES
         if (!colors.empty())
@@ -1349,6 +1379,17 @@ void ViewerImpl::toggle_top_layer_only_view_range()
     update_colors_texture();
 }
 
+// ORCA: enable/disable darkening of the layers below the current top layer (ported from preFlight)
+void ViewerImpl::set_dim_previous_layers(bool value)
+{
+    if (m_settings.dim_previous_layers == value)
+        return;
+    m_settings.dim_previous_layers = value;
+    // defer the actual color/texture rebuild to the next render(), when the GL context is current
+    // (this may be toggled from the Preferences dialog, outside the canvas context)
+    m_settings.update_colors = true;
+}
+
 std::vector<ETimeMode> ViewerImpl::get_time_modes() const
 {
     std::vector<ETimeMode> ret;

src/libvgcode/src/ViewerImpl.hpp

@@ -85,6 +85,10 @@ public:
     bool is_top_layer_only_view_range() const { return m_settings.top_layer_only_view_range; }
     void toggle_top_layer_only_view_range();
 
+    // ORCA: darken layers below the current top layer while scrubbing (ported from preFlight)
+    bool is_dim_previous_layers() const { return m_settings.dim_previous_layers; }
+    void set_dim_previous_layers(bool value);
+
     bool is_spiral_vase_mode() const { return m_settings.spiral_vase_mode; }
 
     std::vector<ETimeMode> get_time_modes() const;

src/slic3r/GUI/GCodeViewer.cpp

@@ -1134,6 +1134,9 @@ void GCodeViewer::load_as_gcode(const GCodeProcessorResult& gcode_result, const
     if (current_top_layer_only != required_top_layer_only)
         m_viewer.toggle_top_layer_only_view_range();
 
+    // ORCA: darken layers below the current one while scrubbing the preview (ported from preFlight)
+    m_viewer.set_dim_previous_layers(get_app_config()->get_bool("preview_dim_previous_layers"));
+
     // avoid processing if called with the same gcode_result
     if (m_last_result_id == gcode_result.id && wxGetApp().is_editor()) {
         //BBS: add logs

src/slic3r/GUI/GCodeViewer.hpp

@@ -333,6 +333,10 @@ public:
 
     libvgcode::EViewType get_view_type() const { return m_viewer.get_view_type(); }
 
+    // ORCA: darken layers below the current top layer while scrubbing the preview (ported from preFlight)
+    void set_dim_previous_layers(bool value) { m_viewer.set_dim_previous_layers(value); }
+    bool is_dim_previous_layers() const { return m_viewer.is_dim_previous_layers(); }
+
     void set_layers_z_range(const std::array<unsigned int, 2>& layers_z_range);
 
     bool is_legend_shown() const { return m_legend_visible && m_legend_enabled; }

src/slic3r/GUI/Preferences.cpp

@@ -3,6 +3,7 @@
 #include "GUI_App.hpp"
 #include "MainFrame.hpp"
 #include "Plater.hpp"
+#include "GLCanvas3D.hpp" // ORCA: for live preview refresh when toggling "Dim lower layers"
 #include "MsgDialog.hpp"
 #include "I18N.hpp"
 #include "libslic3r/AppConfig.hpp"
@@ -1049,6 +1050,16 @@ wxBoxSizer *PreferencesDialog::create_item_checkbox(wxString title, wxString too
                 wxGetApp().mainframe->m_webview->SendCloudProvidersInfo();
             }
         }
+        // ORCA: apply the preview dimming change immediately to the currently loaded preview (ported from preFlight)
+        else if (param == "preview_dim_previous_layers") {
+            if (Plater* plater = wxGetApp().plater()) {
+                if (GLCanvas3D* canvas = plater->get_preview_canvas3D()) {
+                    canvas->get_gcode_viewer().set_dim_previous_layers(app_config->get_bool(param));
+                    canvas->set_as_dirty();
+                    canvas->request_extra_frame();
+                }
+            }
+        }
 
 #ifdef __WXMSW__
         if (param == "associate_3mf") {
@@ -1893,11 +1904,21 @@ void PreferencesDialog::create_items()
     );
     g_sizer->Add(item_fps_overlay);
 
+    //// GRAPHICS > G-code Preview
+    g_sizer->Add(create_item_title(_L("G-code Preview")), 1, wxEXPAND);
+
+    auto item_dim_previous_layers = create_item_checkbox(
+        _L("Dim lower layers"),
+        _L("When scrubbing the layer slider in the sliced preview, render the layers below the current one darkened so that only the layer being viewed is shown at full brightness."),
+        "preview_dim_previous_layers"
+    );
+    g_sizer->Add(item_dim_previous_layers);
+
     g_sizer->AddSpacer(FromDIP(10));
     sizer_page->Add(g_sizer, 0, wxEXPAND);
 
     //////////////////////////
-    //// ONLINE TAB 
+    //// ONLINE TAB
     /////////////////////////////////////
     m_pref_tabs->AppendItem(_L("Online"));
     f_sizers.push_back(new wxFlexGridSizer(1, 1, v_gap, 0));