BUG: The Write() method was modifying the input's origin.

Change-Id: I2be1dafef75133771c3439d7ec07c9aecbd1e19a

IO/vtkMetaImageWriter.cxx

@@ -108,8 +108,10 @@ void vtkMetaImageWriter::Write( )
       }
     }
 
-  double * origin = this->GetInput()->GetOrigin();
-  double * spacingDouble = this->GetInput()->GetSpacing();
+  double origin[3];
+  double spacingDouble[3];
+  this->GetInput()->GetOrigin(origin);
+  this->GetInput()->GetSpacing(spacingDouble);
 
   float spacing[3];
   spacing[0] = spacingDouble[0];