Well, i think the clouds are procedural and you get soft edges in the water. But yeah, i like the scene but the performance is abysmal (45 FPS on "Ultra" on my GTX980 for a scene that generally looks emptier and more repeat-y than what you see when you exit Half-Life 2's metro station).

I'm not sure if it is because of WebGL 2, Firefox, the PlayCanvas engine or just this demo though. But unless WebGL 2 imposes big performance penalties, i doubt this is representative of what could be done.