Add intersect method to create intersect box, provided by hendu

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@4572 dfc29bdd-3216-0410-991c-e03cc46cb475

include/aabbox3d.h

@@ -234,6 +234,25 @@ class aabbox3d
 				MaxEdge.X <= other.MaxEdge.X && MaxEdge.Y <= other.MaxEdge.Y && MaxEdge.Z <= other.MaxEdge.Z);
 		}
 
+		//! Returns the intersection of this box with another, if possible.
+		aabbox3d<T> intersect(const aabbox3d<T>& other) const
+		{
+			aabbox3d<T> out;
+
+			if (!intersectsWithBox(other))
+				return out;
+
+			out.MaxEdge.X = min_(MaxEdge.X, other.MaxEdge.X);
+			out.MaxEdge.Y = min_(MaxEdge.Y, other.MaxEdge.Y);
+			out.MaxEdge.Z = min_(MaxEdge.Z, other.MaxEdge.Z);
+
+			out.MinEdge.X = max_(MinEdge.X, other.MinEdge.X);
+			out.MinEdge.Y = max_(MinEdge.Y, other.MinEdge.Y);
+			out.MinEdge.Z = max_(MinEdge.Z, other.MinEdge.Z);
+
+			return out;
+		}
+
 		//! Determines if the axis-aligned box intersects with another axis-aligned box.
 		/** \param other: Other box to check a intersection with.
 		\return True if there is an intersection with the other box,