Add overlay controls of ND filter in centerview
Add an ui overlay on center view with a 2 axis handle control
ton control rotation and compression.
Maybe something like this:
O 1) | | 3) - - - O-------O - - - - - - 2)
Where handle 1 is used to drag in the vector direction to increase/decrease the compression, handle 2 is used to drag and drop
which affects the offset and the last handle (3) is used to rotate around center of vector.
the - - - - - - is a helper line that runs from edge to edge to indicate the split offset in the image.