Add base to compute lod level automatically

src/graphics/lod_node.cpp

@@ -177,6 +177,7 @@ void LODNode::OnRegisterSceneNode()
                                 m_nodes[0]->getType() == scene::ESNT_ANIMATED_MESH) &&
         now > m_last_tick)
     {
+        printf("Hi, we are in level mode one :p\n\n");
         if (m_previous_visibility == WAS_HIDDEN && shown)
         {
             scene::IMesh* mesh;
@@ -251,13 +252,37 @@ void LODNode::OnRegisterSceneNode()
 
 void LODNode::add(int level, scene::ISceneNode* node, bool reparent)
 {
+    // Dynamic auto computation of LoD level
+    printf("Autocomputation of LoD level: >%s<\n ---- \n", node->getName());
+
+    Box = node->getBoundingBox();
+    float volume = Box.getVolume();
+    float max_draw = 0.0;
+
+    if (volume < 2.0)
+    {
+        max_draw = (volume * 1.3) + 50.0;
+    }
+    else
+    {
+        max_draw = (volume * 0.05) + 100;
+    }
+
+    int level2 = (int) max_draw * (m_detail.size() + 1) * 0.3;
+    
+    
+    printf("Volume: %f\n", max_draw);
+    printf("Level: %d\n", level);
+
+    printf("Level2: %d\n", level2);
+
     // samuncle suggested to put a slight randomisation in LOD
     // I'm not convinced (Auria) but he's the artist pro, so I listen ;P
     // The last level should not be randomized because after that the object disappears,
     // and the location is disapparition needs to be deterministic
     if (m_detail.size() > 0)
     {
-        assert(m_detail.back()<level*level);
+        assert(m_detail.back()<level2*level2);
         m_detail[m_detail.size() - 1] += (int)(((rand()%1000)-500)/500.0f*(m_detail[m_detail.size() - 1]*0.2f));
     }
 
@@ -266,7 +291,7 @@ void LODNode::add(int level, scene::ISceneNode* node, bool reparent)
     node->grab();
     node->remove();
     node->setPosition(core::vector3df(0,0,0));
-    m_detail.push_back(level*level);
+    m_detail.push_back(level2*level2);
     m_nodes.push_back(node);
     m_nodes_set.insert(node);
     node->setParent(this);

src/graphics/lod_node.hpp

@@ -62,6 +62,9 @@ private:
      *  m_forced_lod is >=0, only this level is be used. */
     int m_forced_lod;
 
+    // Volume of the bounding box (for autoLOD computation)
+    int m_volume;
+
     enum PreviousVisibility
     {
         FIRST_PASS,