Add getRadius method for aabbox3d, as suggested by hendu

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@4474 dfc29bdd-3216-0410-991c-e03cc46cb475

include/aabbox3d.h

@@ -115,6 +115,14 @@ class aabbox3d
 			return MaxEdge - MinEdge;
 		}
 
+		//! Get radius of the bounding sphere
+		/** \return Radius of the bounding sphere. */
+		T getRadius() const
+		{
+			const T radius = getExtent().getLength() / 2;
+			return radius;
+		}
+
 		//! Check if the box is empty.
 		/** This means that there is no space between the min and max edge.
 		\return True if box is empty, else false. */

tests/testaabbox.cpp

@@ -211,6 +211,11 @@ static bool doTests()
 		logTestString("default aabbox3d<T> has wrong Extent\n");
 		return false;
 	}
+	if (!core::equals(empty.getRadius(), (T)sqrt(3.0)))
+	{
+		logTestString("default aabbox3d<T> has wrong radius\n");
+		return false;
+	}
 	if (empty.isEmpty())
 	{
 		logTestString("default aabbox3d<T> is empty\n");
@@ -242,6 +247,11 @@ static bool doTests()
 		logTestString("extended aabbox3d<T> has wrong Extent\n");
 		return false;
 	}
+	if (!core::equals(two.getRadius(), (T)sqrt(27./4.)))
+	{
+		logTestString("extended aabbox3d<T> has wrong radius\n");
+		return false;
+	}
 	if (two.isEmpty())
 	{
 		logTestString("extended aabbox3d<T> is empty\n");
@@ -273,6 +283,11 @@ static bool doTests()
 		logTestString("singular aabbox3d<T> has Extent\n");
 		return false;
 	}
+	if (one.getRadius() != 0)
+	{
+		logTestString("singular aabbox3d<T> has radius\n");
+		return false;
+	}
 	if (!one.isEmpty())
 	{
 		logTestString("empty aabbox3d<T> is not empty\n");
@@ -337,6 +352,11 @@ static bool doTests()
 		logTestString("large aabbox3d<T> has wrong Extent\n");
 		return false;
 	}
+	if (!core::equals(one.getRadius(), (T)sqrt(50./4.)))
+	{
+		logTestString("large aabbox3d<T> has wrong radius\n");
+		return false;
+	}
 	if (one.isEmpty())
 	{
 		logTestString("large aabbox3d<T> is empty\n");