Hi, I am trying to replicate the circular hotspot that Matterport uses on this demo

[url]https://matterport.com/sample-real-estate-listing/[/url]

All I can create is a basic circle that just looks flat on a pano. Thier hotspots seem to have a bit more depth and distortion if know what I mean and blend in with the pono. You will see what I mean when you look at the demo.

I want to create a similar situation where I have many panos taken in each room and want to navigate around the room but I dont want a whole load of hotspots ruining the scene. So I need 2 images and tween between them so the initial image is more opac and on mouse over becomes more visible.

Any thoughts or other suggestions appreciated.