Reference pictures: 'only in its own view' (out of the way in 3D and the other views); saved

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/app.cpp

@@ -5648,7 +5648,7 @@ private:
         }
         // Reference pictures: flat, see-through, a little behind the plane through the middle.
         for (const Reference& ref : scene_.references) {
-            if (!ref.visible) continue;
+            if (!ref.visible || (ref.ownViewOnly && !lookingAt(ref.axis))) continue;
             const Picture& pic = picture(ref);
             if (!pic.ok) continue;
             const auto c = referenceCorners(ref, pic.aspect);
@@ -7310,6 +7310,8 @@ private:
             undoable([&] { return ImGui::DragFloat("Width (m)", &ref->width, 0.005f, -100.0f, 100.0f, "%.3f"); });
             ImGui::TextDisabled("A minus width flips it.");
             undoable([&] { return ImGui::SliderFloat("See-through", &ref->opacity, 0.05f, 1.0f); });
+            if (ImGui::Checkbox("Only in its own view", &ref->ownViewOnly)) dirty_ = true;
+            if (ImGui::IsItemHovered()) ImGui::SetTooltip("Shown only looking straight at it (front, side or top): out of the way in the 3D view and the others");
             if (ImGui::Button("Remove picture", ImVec2(w, 0))) deleteSelected();
             ImGui::End();
             return;
@@ -8250,6 +8252,14 @@ private:
         }
     }
 
+    // Looking straight at a reference picture's plane (the front picture from the front or the back...).
+    bool lookingAt(Axis a) const {
+        switch (a) {
+        case Axis::Front: return view_ == View::Front || view_ == View::Back;
+        case Axis::Top: return view_ == View::Top || view_ == View::Bottom;
+        default: return view_ == View::Left || view_ == View::Right;
+        }
+    }
     std::string workspaceDir() const { return keel::prefPath() + "workspaces/"; }
     void resetLayout() {
         layoutAgain_ = true, layoutDone_ = false;

src/scene.cpp

@@ -224,7 +224,7 @@ std::string sceneText(const Scene& scene) {
     for (const SceneScript& s : scene.scripts) out << "script " << quoted(s.name) << " " << s.code.size() << "\n" << s.code << "\n";
     for (const Reference& r : scene.references)
         out << "reference " << quoted(r.path) << " " << axisName(r.axis) << " " << r.offset.x << " " << r.offset.y << " " << r.width << " " << r.opacity
-            << " " << r.visible << "\n";
+            << " " << r.visible << " " << r.ownViewOnly << "\n";
     // Folders by their place in the file (1 up; 0 the top), as ids change on loading.
     std::map<uint32_t, size_t> folderAt;
     for (size_t i = 0; i < scene.folders.size(); ++i) folderAt[scene.folders[i].id] = i + 1;
@@ -339,6 +339,7 @@ std::optional<Scene> parseScene(std::istream& in, const std::string& path, std::
             r.path = readQuoted(l);
             std::string axis;
             l >> axis >> r.offset.x >> r.offset.y >> r.width >> r.opacity >> r.visible;
+            if (!(l >> r.ownViewOnly)) r.ownViewOnly = false; // (not in files from before 0.8)
             r.axis = axis == "front" ? Axis::Front : axis == "top" ? Axis::Top : Axis::Side;
             s.references.push_back(r);
         } else if (word == "look") {

src/scene.h

@@ -112,6 +112,7 @@ struct Reference {
     float width = 1.0f;         // metres across
     float opacity = 0.6f;
     bool visible = true;
+    bool ownViewOnly = false; // (shown only looking straight at it: a front drawing not in the way from the side)
 };
 
 // The Render tab's light and look.