Merge private branch.

src/nvmath/Basis.h

@@ -54,7 +54,8 @@ namespace nv
 				tangent.z() * bitangent.x() * normal.y() - tangent.x() * bitangent.z() * normal.y();
 		}
 		
-		/*
+		bool isValid() const;
+		
 		// Get transform matrix for this basis.
 		NVMATH_API Matrix matrix() const;
 		
@@ -66,7 +67,7 @@ namespace nv
 
 		// Transform by the inverse. (From object space to this basis).
 		NVMATH_API Vector3 transformI(Vector3::Arg v) const;
-		*/
+
 		
 		Vector3 tangent;
 		Vector3 bitangent;