Hi,
I’m trying to implementation the tiles of imageryLayer fade in/out when the zoom change（to make it switch smoothly).I found that alpha property might do that and it accepts either Number or function.
When i used
{ alpha: 1 }
or other number, it work fine. But the earth turns black when i try to use function like
{
alpha: function(frameState, layer, x, y, level) {
console.log(x, y, level)
return 1;
},
}
What did I do wrong？ Or how can i to implementation what i want？
