I have 3 layers in a TImageEnVect. I would like to make a selection and then allow which layer to "show through" the selection, like a cutout hole. How would I do this efficiently?
Unfortunately, this may not be possible. The layer that shows is the topmost layer, so just by making a selection will not achieve what you are looking for.
Nigel may have an idea for this, but I suspect it is just not possible to achieve.