Fix an issue with groups, and add Chapter 14 example!

source/include/group.h

@@ -37,10 +37,10 @@ public:
     Shape *operator[](const int p) { return this->objectList[p]; }
 
     Intersect intersect(Ray r);
-
     BoundingBox getBounds();
 
     void updateBoundingBox();
+    void updateTransform();
 
     Group();
 };

source/include/shape.h

@@ -61,7 +61,8 @@ public:
     virtual BoundingBox getBounds();
     virtual bool haveFiniteBounds() { return true; };
 
-    void updateTransform();
+    virtual void updateTransform();
+
     Tuple worldToObject(Tuple point) { return this->inverseTransform * point; };
     Tuple objectToWorld(Tuple point) { return this->transformMatrix * point; };
     Tuple normalToWorld(Tuple normalVector);

source/shapes/group.cpp

@@ -136,4 +136,32 @@ void Group::updateBoundingBox()
             }
         }
     }
+}
+
+void Group::updateTransform()
+{
+    int i;
+
+    Shape::updateTransform();
+    if (this->objectCount > 0)
+    {
+        for (i = 0 ; i < this->objectCount ; i++)
+        {
+            this->objectList[i]->updateTransform();
+        }
+    }
+
+    /* We are force to do them all the time */
+    if (this->unboxableObjectCount > 0)
+    {
+        for(i = 0; i < this->unboxableObjectCount; i++)
+        {
+            this->unboxableObjectList[i]->updateTransform();
+        }
+    }
+
+    /* Once the full stack being notified of the changes, let's update the
+     * bounding box
+     */
+    this->updateBoundingBox();
 }