How can i get fully transparent

In playground line 30, engine.clear(new BABYLON.Color4(0, 0, 0, 0.1), true, false)
If i modify to new BABYLON.Color4(0, 0, 0, 0), GlowLayer effect doesn’t work.
What am i missing?

It seems to work for me.


oh… i will check it in my desktop later…