ovis: allow manipulating entity material and scale at runtime

modules/ovis/include/opencv2/ovis.hpp

@@ -38,6 +38,12 @@ enum MaterialProperty
     MATERIAL_TEXTURE
 };
 
+enum EntityProperty
+{
+    ENTITY_MATERIAL,
+    ENTITY_SCALE,
+};
+
 /**
  * A 3D viewport and the associated scene
  */
@@ -76,6 +82,17 @@ public:
      */
     CV_WRAP virtual void removeEntity(const String& name) = 0;
 
+    /**
+     * set the property of an entity to the given value
+     * @param name entity name
+     * @param prop @ref EntityProperty
+     * @param value the value
+     */
+    CV_WRAP virtual void setEntityProperty(const String& name, int prop, const Scalar& value) = 0;
+
+    /// @overload
+    CV_WRAP virtual void setEntityProperty(const String& name, int prop, const String& value) = 0;
+
     /**
      * convenience method to visualize a camera position
      *

modules/ovis/src/ovis.cpp

@@ -427,6 +427,33 @@ public:
         node.setPosition(t);
     }
 
+    void setEntityProperty(const String& name, int prop, const String& value)
+    {
+        CV_Assert(prop == ENTITY_MATERIAL);
+        SceneNode& node = _getSceneNode(sceneMgr, name);
+
+        MaterialPtr mat = MaterialManager::getSingleton().getByName(value, RESOURCEGROUP_NAME);
+        CV_Assert(mat && "material not found");
+
+        Camera* cam = dynamic_cast<Camera*>(node.getAttachedObject(name));
+        if(cam)
+        {
+            cam->setMaterial(mat);
+            return;
+        }
+
+        Entity* ent = dynamic_cast<Entity*>(node.getAttachedObject(name));
+        CV_Assert(ent && "invalid entity");
+        ent->setMaterial(mat);
+    }
+
+    void setEntityProperty(const String& name, int prop, const Scalar& value)
+    {
+        CV_Assert(prop == ENTITY_SCALE);
+        SceneNode& node = _getSceneNode(sceneMgr, name);
+        node.setScale(value[0], value[1], value[2]);
+    }
+
     void _createBackground()
     {
         String name = "_" + sceneMgr->getName() + "_DefaultBackground";