How to prevent stripping OcclusionCullingData type when using IL2CPP?

Kichang-Kim · August 28, 2019, 8:49am

Hi. I found that when I used OcclusionCulling only scenes in AssetBundle, it shows “Could not produce class with ID 363” error in player build. After investigating, class ID 363 means “OcclusionCullingData” type.

How to prevent IL2CPP stripping for that type?

I tried this link.xml but not works:

(I used reflection and UnityType class for getting above information. It’s module name is “Umbra” and namespace is empty.)

Any ideas?
Thanks.

JoshPeterson · August 29, 2019, 12:42pm

The link.xml file won’t work in this case. It is used to preserve managed code, but OcclusionCulling is a native code engine type.

I think that you have two options:

Disable “Strip Engine Code” in the player settings. This will cause your build size to be larger, but should eliminate this issue.
Use a custom build process to inform the Unity editor about the native engine code types used in your asset bundles. You can see an example of how to do this here: https://bitbucket.org/Unity-Technologies/assetbundledemo/src/493e9bab409473147ef2c0990917b28d80c86d3d/demo/Assets/AssetBundleManager/Editor/BuildScript.cs#lines-122

Kichang-Kim · August 30, 2019, 1:41am

It seems that both 1 and 2 are not suitable for my case. My project is composite of two separated parts (client only build and assetbundle only build).

I found that adding very small scene (1 renderer + OC) to client can solve this issue.

JoshPeterson · August 30, 2019, 1:49am

That works as well!