Simply support 3MF Production Extension.

Author: cmguo

include/Savitar/Scene.h

@@ -40,7 +40,7 @@ class Scene
     /**
      * Set the data of this SceneNode by giving it a xml node
      */
-    void fillByXMLNode(pugi::xml_node xml_node);
+    void fillByXMLNode(const std::string& path, pugi::xml_node xml_node);
 
     /**
      * Store a metadata entry as metadata.
@@ -86,7 +86,7 @@ class Scene
      * Because 3mf uses references, we also need to provide the root_node, so it's know what the reference points to
      * \returns The created SceneNode.
      */
-    SceneNode* createSceneNodeFromObject(pugi::xml_node root_node, pugi::xml_node object_node);
+    SceneNode* createSceneNodeFromObject(const std::string& path, pugi::xml_node root_node, pugi::xml_node object_node);
 };
 } // namespace Savitar
 #endif

include/Savitar/SceneNode.h

@@ -36,6 +36,13 @@ class SceneNode
      */
     void fillByXMLNode(pugi::xml_node xml_node);
 
+    /**
+     * Get the (unique) identifier of the node.
+     */
+    [[nodiscard]] std::string getPath();
+
+    void setPath(std::string id);
+
     /**
      * Get the (unique) identifier of the node.
      */
@@ -74,6 +81,7 @@ class SceneNode
     std::vector<SceneNode*> children_;
     MeshData mesh_data_;
     std::map<std::string, MetadataEntry> settings_;
+    std::string path_;
     std::string id_;
     std::string name_;
     std::string type_{ "model" };

src/Scene.cpp

@@ -23,7 +23,7 @@ void Scene::addSceneNode(SceneNode* node)
 }
 
 
-void Scene::fillByXMLNode(pugi::xml_node xml_node)
+void Scene::fillByXMLNode(const std::string& path, pugi::xml_node xml_node)
 {
     unit_ = xml_node.attribute("unit").as_string();
 
@@ -44,14 +44,26 @@ void Scene::fillByXMLNode(pugi::xml_node xml_node)
         setMetaDataEntry(key, value, type, preserve);
     }
 
+    if (!path.empty())
+    {
+        for (pugi::xml_node object = resources.child("object"); object != nullptr; object = object.next_sibling("object"))
+        {
+            SceneNode* temp_scene_node = createSceneNodeFromObject(path, xml_node, object);
+            std::cout << "sub component " << temp_scene_node->getPath() << ":" << temp_scene_node->getId() << std::endl;
+            scene_nodes_.push_back(temp_scene_node);
+        }
+        return;
+    }
+
+    std::vector<SceneNode*> scene_nodes;
     pugi::xml_node build = xml_node.child("build");
     for (pugi::xml_node item = build.child("item"); item != nullptr; item = item.next_sibling("item"))
     {
         // Found a item in the build. The items are linked to objects by objectid.
         pugi::xml_node object_node = resources.find_child_by_attribute("object", "id", item.attribute("objectid").value());
         if (object_node != nullptr)
         {
-            SceneNode* temp_scene_node = createSceneNodeFromObject(xml_node, object_node);
+            SceneNode* temp_scene_node = createSceneNodeFromObject(path, xml_node, object_node);
             temp_scene_node->setTransformation(item.attribute("transform").as_string());
 
             // Get all metadata from the item and update that.
@@ -73,21 +85,23 @@ void Scene::fillByXMLNode(pugi::xml_node xml_node)
                 }
             }
 
-            scene_nodes_.push_back(temp_scene_node);
+            scene_nodes.push_back(temp_scene_node);
         }
         else
         {
             // TODO: add proper error handling
             std::cout << "Could not find object by given ID" << std::endl;
         }
     }
+    scene_nodes.swap(scene_nodes_);
 }
 
-SceneNode* Scene::createSceneNodeFromObject(pugi::xml_node root_node, pugi::xml_node object_node)
+SceneNode* Scene::createSceneNodeFromObject(const std::string& path, pugi::xml_node root_node, pugi::xml_node object_node)
 {
     pugi::xml_node components = object_node.child("components");
     auto* scene_node = new SceneNode();
     scene_node->fillByXMLNode(object_node);
+    scene_node->setPath(path);
 
     std::map<std::string, std::string>::iterator it;
     const bool has_mesh_node = scene_node->getSettings().find("mesh_node_objectid") != scene_node->getSettings().end();
@@ -106,10 +120,33 @@ SceneNode* Scene::createSceneNodeFromObject(pugi::xml_node root_node, pugi::xml_
         for (pugi::xml_node component = components.child("component"); component != nullptr; component = component.next_sibling("component"))
         {
             // This node has children. Add them one by one.
+            std::string path = component.attribute("p:path").value();
+            if (!path.empty())
+            {
+                auto id = component.attribute("objectid").value();
+                bool found = false;
+                for (auto node : scene_nodes_)
+                {
+                    if (node->getPath() == path && node->getId() == id)
+                    {
+                        auto* child_node = new SceneNode();
+                        child_node->setMeshData(node->getMeshData());
+                        child_node->setTransformation(component.attribute("transform").as_string());
+                        scene_node->addChild(child_node);
+                        found = true;
+                        break;
+                    }
+                }
+                if (!found)
+                {
+                    std::cout << "sub component not found :( " << path << ":" << id << std::endl;
+                }
+                continue;
+            }
             pugi::xml_node child_object_node = root_node.child("resources").find_child_by_attribute("object", "id", component.attribute("objectid").value());
             if (child_object_node != nullptr)
             {
-                SceneNode* child_node = createSceneNodeFromObject(root_node, child_object_node);
+                SceneNode* child_node = createSceneNodeFromObject(path, root_node, child_object_node);
                 if (has_mesh_node && mesh_node_object_id == component.attribute("objectid").as_string())
                 {
                     // Don't add a node with the mesh_node_objectid metadata. Store it until last so we can copy it's mesh to the parent node

src/SceneNode.cpp

@@ -127,6 +127,16 @@ void SceneNode::fillByXMLNode(pugi::xml_node xml_node)
     }
 }
 
+std::string SceneNode::getPath()
+{
+    return path_;
+}
+
+void SceneNode::setPath(std::string path)
+{
+    path_ = path;
+}
+
 std::string SceneNode::getId()
 {
     return id_;

src/ThreeMFParser.cpp

@@ -17,10 +17,32 @@ ThreeMFParser::ThreeMFParser()
 
 Scene ThreeMFParser::parse(const std::string& xml_string)
 {
+    size_t xml_start = 0;
+    std::string path;
+    if (!xml_string.empty() && xml_string.front() == '/')
+    {
+        xml_start = xml_string.find(':');
+        if (xml_start != std::string::npos)
+        {
+            path = xml_string.substr(0, xml_start);
+            ++xml_start;
+        }
+    }
+
+    static Scene g_scene;
     pugi::xml_document document;
-    document.load_string(xml_string.c_str());
-    Scene scene;
-    scene.fillByXMLNode(document.child("model"));
+    document.load_string(xml_string.c_str() + xml_start);
+    Scene scene = g_scene;
+    scene.fillByXMLNode(path, document.child("model"));
+
+    if (path.empty())
+    {
+        g_scene = Scene();
+    }
+    else
+    {
+        g_scene = scene;
+    }
 
     return scene;
 }