Display 2 Panos at same time, with a 3rd used as alpha mask

Hi Guys

Is it possible to display 2 different panos at the same time, but use a 3rd pano as an alpha mask?

In other words almost like the Slider Example, but instead of a slider that adjusts the opacity of the one, I want to control the 2nd one with a BW image from a 3rd pano

nobody else needed something like this before?

Quote from Tuur

Of course.. we all do.
But it is not that simple since flash is gone.
Maybe the example below is a bit of topic, but close .. in a way..
I made this in 2011 (flash)
https://www.virtualtuur.com/krpano/vector/3

And here is a recent version, without the wobbeling of the boat and sound (i think)
https://www.virtualtuur.com/krpano/vector/new/

2panos and a duck in between.
Was a fun experiment at that time..

Tuur

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The 2nd newer versions is cool and looks like what I need. How did you manage to do it?

EDIT: Ah the boat is not actual pano, its hotspots with alpha. Nicely done!