As I mentioned in the question, I need to take player’s attention to some specific positions on the screen. As you can see in the picture some candies are faded and some are flashed out. I need to make this darkening screen but I also need to flash the important
areas. And I am stuck. I would be so glad if you can show me a way to do this information screen.
If you need to darken everything once, like for tutorial, then you could pre-create transparent black texture with cut out zone. But it might give you problems if screen sizes are different as it will actually squeeze or stretch the texture. So you might have to write smart rendering or similar approach.
Other solution would be writing smart mask or texture creator which will work as a mask.