It's a push to call the Unreal 4 support decent. Unity at least have it as part of their product feature set. Unreal seem to do it only as a demonstration piece.
The problem with taking a engine like Unity or Unreal and compiling to javascript is that 1) they end up with very large blobs of javascript (Unity is around 5MB of JS for the webplayer alone) 2) It is impossible to optimize, debug or inspect any of that code in the target setting. Neither of these engines have ever demonstrated code running on mobile browsers for good reasons, they can't.
Meanwhile, engines designed specifically for the web, for example, PlayCanvas [https://playcanvas.com] let you create content that works on every device, down to the likes of the iPhone 4S and comes in much smaller download sizes. e.g.
All of which work on mobile browsers. The future of Web 3D is not compilation of desktop game engines. It's engine's designed to be web (and mobile) first.
The problem with taking a engine like Unity or Unreal and compiling to javascript is that 1) they end up with very large blobs of javascript (Unity is around 5MB of JS for the webplayer alone) 2) It is impossible to optimize, debug or inspect any of that code in the target setting. Neither of these engines have ever demonstrated code running on mobile browsers for good reasons, they can't.
Meanwhile, engines designed specifically for the web, for example, PlayCanvas [https://playcanvas.com] let you create content that works on every device, down to the likes of the iPhone 4S and comes in much smaller download sizes. e.g.
http://tanx.playcanvas.com (~1MB)
http://mmx.playcanvas.com (~3MB)
http://swooop.playcanvas.com (~10MB)
All of which work on mobile browsers. The future of Web 3D is not compilation of desktop game engines. It's engine's designed to be web (and mobile) first.