They only technical explanation is apparently the 'little demand for it' and 'not enough capacity to develop it further'?
The 3D mode was indeed the most interesting and unique tool Windytv offered for those who tried to look at things a bit further.
I see, you get at first the direction arrows of wave types. That’s because you have selected one of your favourites (Porto Ercole): It opens the forecast diagram and give directly the direction arrows.
To get the same picker as the one I’ve shown, you must click just near your favourite location.
Don’t worry if it’s not exactly on your favourite location because the wave model has a resolution of 13km.
Note that close to the sea shore wave models cannot be very accurate. They give the wave conditions offshore.
(Your website is very nice !)