OctTree differentiates between static/dynamic objects now. Added a general BoxesInSameRegion method.

include/Engine/Core/OctTree.h

@@ -16,8 +16,21 @@ public:
     ~OctTree();
     //For the root OctTree, [octTreeBounds] should be a box containing the entire level.
     OctTree(const AABB& octTreeBounds, int subDivisions);
-    void AddBox(const AABB& box);
-    void ClearBoxes();
+
+    //We should only ever need one OctTree in the game, and it should not need to be copied.
+    //Define these if the OctTree suddenly needs to be copied, think of the children OctTree* ptrs. 
+    OctTree(const OctTree& other) = delete;
+    OctTree(const OctTree&& other) = delete;
+    OctTree& operator= (const OctTree& other) = delete;
+
+    void AddDynamicObject(const AABB& box);
+    void AddStaticObject(const AABB& box);
+
+    void BoxesInSameRegion(const AABB& box, std::vector<AABB>& outBoxes) const;
+
+    void ClearObjects();
+    void ClearDynamicObjects();
+
     //Returns true if the ray collides with something in the tree. Result is written to [data].
     bool RayCollides(const Ray& ray, Output& data) const;
     //Returns true if the box collides with something in the tree. 
@@ -26,10 +39,12 @@ public:
 
 private:
     OctTree* m_Children[8];
-    //TODO: Do derived class from AABB with a bool Tested, falsify at 
-    //start of Collision test, set on check, don't check if set already. Solves duplicate boxes in tree.
-    //TODO: Boxes collide with themselves? Fix somehow, maybe float epsilon stuff.
-    std::vector<AABB> m_ContainingBoxes;
+    //WTODO: Do -derived class from AABB- struct containing AABB, with a bool Tested, falsify at 
+    //start of Collision test, set on check, don't check if set already. Solves duplicate boxes in tree. 
+    //Store indices in the struct, pointing to grand ancestor list of boxes, need the same AABB not copies to save Tested.
+    //WTODO: Boxes collide with themselves? Fix somehow, maybe float epsilon stuff.
+    std::vector<AABB> m_StaticObjects;
+    std::vector<AABB> m_DynamicObjects;
     AABB m_Box;
 
     inline bool hasChildren() const;

src/Engine/Core/OctTree.cpp

@@ -88,10 +88,16 @@ bool OctTree::BoxCollides(const AABB& boxToTest, AABB& outBoxIntersected) const
                 return true;
         }
     } else {
-        for (const auto& objBox : m_ContainingBoxes) {
-            if (Collision::AABBVsAABB(boxToTest, objBox)) {
-                outBoxIntersected = objBox;
-                return true;
+        std::vector<std::vector<AABB>> objVectors = {
+            m_StaticObjects,
+            m_DynamicObjects
+        };
+        for (const auto& objVector : objVectors) {
+            for (const auto& obj : objVector) {
+                if (Collision::AABBVsAABB(boxToTest, obj)) {
+                    outBoxIntersected = obj;
+                    return true;
+                }
             }
         }
     }
@@ -121,13 +127,20 @@ bool OctTree::RayCollides(const Ray& ray, Output& data) const
             //Check against boxes in the node.
             float minDist = INFINITY;
             bool intersected = false;
-            for (const auto& objBox : m_ContainingBoxes) {
-                float dist;
-                if (Collision::RayVsAABB(ray, objBox, dist)) {
-                    minDist = std::min(dist, minDist);
-                    intersected = true;
+            std::vector<std::vector<AABB>> objVectors = {
+                m_StaticObjects,
+                m_DynamicObjects
+            };
+            for (const auto& objVector : objVectors) {
+                for (const auto& obj : objVector) {
+                    float dist;
+                    if (Collision::RayVsAABB(ray, obj, dist)) {
+                        minDist = std::min(dist, minDist);
+                        intersected = true;
+                    }
                 }
             }
+
             data.CollideDistance = minDist;
             return intersected;
         }
@@ -135,26 +148,61 @@ bool OctTree::RayCollides(const Ray& ray, Output& data) const
     return false;
 }
 
-void OctTree::AddBox(const AABB& box)
+
+void OctTree::AddDynamicObject(const AABB& box)
 {
     if (hasChildren()) {
         for (auto i : childIndicesContainingBox(box)) {
-            m_Children[i]->AddBox(box);
+            m_Children[i]->AddDynamicObject(box);
         }
     } else {
-        m_ContainingBoxes.push_back(box);
+        m_DynamicObjects.push_back(box);
     }
 }
 
-//TODO: Only clear dynamic boxes, AddDynamic, AddStatic
-void OctTree::ClearBoxes()
+void OctTree::AddStaticObject(const AABB& box)
+{
+    if (hasChildren()) {
+        for (auto i : childIndicesContainingBox(box)) {
+            m_Children[i]->AddStaticObject(box);
+        }
+    } else {
+        m_StaticObjects.push_back(box);
+    }
+}
+
+void OctTree::BoxesInSameRegion(const AABB& box, std::vector<AABB>& outBoxes) const
+{
+    if (hasChildren()) {
+        for (auto i : childIndicesContainingBox(box)) {
+            m_Children[i]->BoxesInSameRegion(box, outBoxes);
+        }
+    } else {
+        outBoxes.insert(outBoxes.end(), m_StaticObjects.begin(), m_StaticObjects.end());
+        outBoxes.insert(outBoxes.end(), m_DynamicObjects.begin(), m_DynamicObjects.end());
+    }
+}
+
+void OctTree::ClearObjects()
 {
     if (hasChildren()) {
         for (OctTree*& c : m_Children) {
-            c->ClearBoxes();
+            c->ClearObjects();
         }
     } else {
-        m_ContainingBoxes.clear();
+        m_DynamicObjects.clear();
+        m_StaticObjects.clear();
+    }
+}
+
+void OctTree::ClearDynamicObjects()
+{
+    if (hasChildren()) {
+        for (OctTree*& c : m_Children) {
+            c->ClearObjects();
+        }
+    } else {
+        m_DynamicObjects.clear();
     }
 }
 
@@ -194,7 +242,7 @@ std::vector<int> OctTree::childIndicesContainingBox(const AABB& box) const
     case 2:
     {
         std::vector<int> ret;
-        //Bit-hax to calculate the right 4 cildren containing the box.
+        //Bit-hax to calculate the correct 4 children containing the box.
         //This works because of the childrens index determine what part of 
         //the dimensions they are responsible for (which octant).
         bits.flip();

src/Tests/CollisionTest.cpp

@@ -92,12 +92,14 @@ BOOST_AUTO_TEST_CASE(octTest)
     glm::vec3 mini = glm::vec3(-1, -1, -1);
     glm::vec3 maxi = glm::vec3(1, 1, 1);
     OctTree tree(AABB(mini, maxi), 2);
-    tree.AddBox(AABB(mini, -0.9f*maxi));
+    tree.AddDynamicObject(AABB(mini, -0.9f*maxi));
     OctTree::Output data;
     glm::vec3 origin = 3.0f * mini;
-    BOOST_CHECK(tree.RayCollides({origin , glm::normalize(mini - origin) }, data));
-    tree.ClearBoxes();
-    BOOST_CHECK(!tree.RayCollides({ origin , glm::normalize(mini - origin) }, data));
+    bool rayIntersected = tree.RayCollides({ origin , glm::normalize(mini - origin) }, data);
+    BOOST_CHECK(rayIntersected);
+    tree.ClearDynamicObjects();
+    rayIntersected = tree.RayCollides({ origin , glm::normalize(mini - origin) }, data);
+    BOOST_CHECK(!rayIntersected);
 }
 
 BOOST_AUTO_TEST_SUITE_END()