shape transparency

[jvila]

I answered this in other thread, I copy the answer:

THAT IS ONE OF THE POINTS WHAT I WANTED TO EXPLAIN, multiple step transparency, you catched it Charles, the other point is shape transparency, I know you can get it with actual tools but I think that shape transparency would be easier and interactive, the same request I've made to fill tool in other thread.

I'm attaching a drawing about what I mean with shape transparency obviously the edges would be manage with profiles to get more sharpness o feathering.
I hope I have been clear enough.
anyway step transprency is much more than good news.
Best regards