Questions about large scene streaming (Megacity video in Unite LA)

Hi, I have some questions about large scene streaming technique, introduced in Megacity video (

)

1. Hierarchical culling
It said that Megacity uses ECS for hierarchical culling technique so massive objects can be very quickly. Is this means that Unity will open internal culling pipeline to user for custumizing it? (like new Scriptable Render Pipeline) or simply turn on/off renderer manually from script?

2. Lightmap
When creating large scene, baked lightmap can be problem especially if scene has massive objects. In my current project, I solved this by dividing entire scene into sub-scenes. But It seems that Megacity sample has only one scene. How Megacity handles lightmap?

3. Streamed LOD
At 06:39 of Megacity video, the buliding prefabs looks asynchronously loaded even in Editor mode. Is this Unity's built-in LOD system? or manually written via ECS (if so, can you provide breif algorithm)?

Thanks.

 

Watch Day 2 sessions which describes all of this. Mike - LOD and Culling, Fabrice Lete and Simon Mogenses - Streaming and Serialization and other.

Every building is sub-scene (~200k objects in sub-scene) and this describes in Day 2 Sessions too.

 

@eizenhorn
Oh, I completely missed full livestream. Thanks.

 

Is Megacity going to be released for 2019.1?

 

Ask and ye shall receive. https://unity.com/megacity

 

Super cool. Took a while to download and open, and it's pretty slow to move around and make edits. Also, the performance doesn't seem to be quite what I was expecting. I get dips all the way down to 16fps. I didn't make a build yet, so I assume there is a ton of debug stuff that is going on. Still, very nice. The detail is redonk.

 

Rule #1, never gauge performance by what you see in the editor.
Rule #2, see Rule #1.

 

In my game I currently have dozens of complex building prefabs with full interiors on a large terrain so that both are visible simultaneously (ie, you don't have a seperate scene for the terrain versus the interior of a particular building. I would like to make those buildings sub-scenes to increase performance in the editor and possibly at run-time, especially being able to bake them separately from each other as shown in the megacity demo. Some of the objects that make up the buildings themselves have lots of different monobehaviours for scripts, calling Lua AI, object hover outline etc.
However I'm using the standard pipeline and monobehaviours in 2018.3

So I'm I right in thinking I can't take advantage of sub-scenes unless I move to ECS and 2019?

 

You could still take advantage of asynchronously loading scenes as needed. That has been in Unity and working well for quite some time. I have been using World Streamer for that which lets you async load/unload terrains, buildings, building interiors and what not on a layered basis if you wanted to. To actually use this newer system though, it requires ECS as part of it involves loading things within a separate world first then moving it over to your main world.

 

Ah so it does use ECS.. ok, thanks for the clarification.
I really wanted the subscene implementation, not the loadsceneasync for additive scene which I've used before.