[vtkusers] Flipping one normal

[Christer Larsson]

Hello,

I have an application where I visualize the normals of a polygon mesh. When
I pick one polygon I  would like to flip only that polygon normal (and also
the point ordering at the same time). I pick the cell using vtkCellPicker
and get the cellId of the cell I want to flip the normal of. I can then flip
all the normals if I want.
My question is then: How do I flip only the normal of the picked cell?

Regards
Christer Larsson