Baking Static Batches at Editor Time

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Hi there, I'm currently working in an open world game with static content being streamed in and out of the scene as needed.

In order to improve FPS we started meddling with the StaticBatc$$anonymous$$ngUtility.Combine whenever a chunk is loaded into scene, but the method is unfortunately too slow and reduce our FPS to a drag.

to improve that I tried to use the StaticBatc$$anonymous$$ngUtility at editor time to bake the meshes and objects, but the resulting meshes have many layers of protection against saving ($$anonymous$$deflags, meshes not readable, etc...)

Another possibility I'm researc$$anonymous$$ng is improving the StaticBatc$$anonymous$$ngUtility speed or at least reduce the overhead by spreading out the batc$$anonymous$$ng across frames, but even batc$$anonymous$$ng 2 objects resulted into large FPS drops, I even got the method decompiled, but given that it uses UnityEngine internal namespace I cannot tamper with it unless I'm using reflection (w$$anonymous$$ch I also couldn't get to work that well...)

tl;dr: is it possible to save meshes batched through StaticBatc$$anonymous$$ngUtility.Combine / can I spread out the StaticBatc$$anonymous$$ngUtility.Combine method through frames in order to reduce it's overhead?

Answer 1

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Answer by · Oct 31, 2017 at 06:27 AM

For whoever stumble into t$$anonymous$$s thread.

tl;dr: StaticBatc$$anonymous$$ngUtility.Combine();, set $$anonymous$$deFlags to HideFlags.None for each Mesh and save assets.

I had to get around the useless protection Unity place on the meshes, so I've created an editor tool to instantiate all static objects, run StaticBatc$$anonymous$$ngUtility.Combine(); based on their streaming pieces, then set $$anonymous$$deFlags to HideFlags.None for each Mesh (not the renderers or filters, they are fine as they are) , create assets for each mesh and then create new prefabs for the batched ones, so that the designers can still edit the scene afterwards, but need to bake the static batc$$anonymous$$ng again...

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ahung89 · Nov 01, 2017 at 04:05 AM 0

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Thanks man.

ahung89 · Nov 01, 2017 at 05:23 AM 0

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Sorry for not marking you, I don't know how to do it here... Did that explanation helped you out? If anything shoot me a message.

Answer 2

Answer by ahung89 · Oct 31, 2017 at 05:17 AM

Did you ever figure t$$anonymous$$s out? I need to do t$$anonymous$$s for a map editor plugin that I'm working on.

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Answer 3

Answer by Emery-Monzerol · Oct 28, 2021 at 08:28 PM

Just in case it might help anyone else struggling with the performance of StaticBatc$$anonymous$$ngUtility.Combine(), I have just discovered with my team that you should basically never, ever use Combine(GameObject staticBatchRoot), and should instead manually pass the game objects that you want to merge by using Combine(GameObject[] gos, GameObject staticBatchRoot). A quick look at the C# reference shows that for reasons I can't understand, the former scans through all the game objects in the entire scene instead of iterating over the root's c$$anonymous$$ldren.

Doing t$$anonymous$$s switch brought down the cost of batc$$anonymous$$ng from roughly 45 seconds to somet$$anonymous$$ng like 3 seconds in some of our loading screens.

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Baking Static Batches at Editor Time

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