Work on generating surface patches on demand.

library/source/PolyVoxCore/IndexedSurfacePatch.cpp

@@ -27,6 +27,7 @@ namespace PolyVox
 {
 	IndexedSurfacePatch::IndexedSurfacePatch()
 	{
+		m_iTimeStamp = -1;
 	}
 
 	IndexedSurfacePatch::~IndexedSurfacePatch()	  

library/source/PolyVoxCore/Region.cpp

@@ -69,4 +69,14 @@ namespace PolyVox
 		m_v3dLowerCorner += amount;
 		m_v3dUpperCorner += amount;
 	}
+
+	void Region::shiftLowerCorner(const Vector3DInt32& amount)
+	{
+		m_v3dLowerCorner += amount;
+	}
+
+	void Region::shiftUpperCorner(const Vector3DInt32& amount)
+	{
+		m_v3dUpperCorner += amount;
+	}
 }