Fixes volume mask
Includes fixes from !2196 (merged) to merge them into 7.1.1.
Fixes volume mask update issue pointed out in VTK user's list (meow@mat.uni.torun.pl).
Includes fixes from !2196 (merged) to merge them into 7.1.1.
Fixes volume mask update issue pointed out in VTK user's list (meow@mat.uni.torun.pl).