Added Macro's new cube map generation classes and osgcubemap demo.

src/osgUtil/HalfWayMapGenerator.cpp

@@ -0,0 +1,16 @@
+#include <osgUtil/HalfWayMapGenerator>
+
+using namespace osgUtil;
+
+HalfWayMapGenerator::HalfWayMapGenerator(const osg::Vec3 &light_direction, int texture_size)
+:	CubeMapGenerator(texture_size),
+	ldir_(light_direction)
+{
+	ldir_.normalize();
+}
+
+HalfWayMapGenerator::HalfWayMapGenerator(const HalfWayMapGenerator &copy, const osg::CopyOp &copyop)
+:	CubeMapGenerator(copy, copyop),
+	ldir_(copy.ldir_)
+{
+}