Official documentation about Iris is rather sparse (and as I noticed in several instances, slightly outdated). Epic is very quiet about Iris, hopefully it won’t be silently abandonned as it is very useful for what I’m planning for my project .
I’m using 5.4.4 and am trying to make my own dynamic filter:
I’m stuck even before being able to start. Visual Studio outputs some linker error, even though everything looks fine to me:
1>Module.UnrealBlox.2.cpp.obj : error LNK2019: unresolved external symbol "private: static class UClass * __cdecl UNetObjectFilter::GetPrivateStaticClass(void)" (?GetPrivateStaticClass@UNetObjectFilter@@CAPEAVUClass@@XZ) referenced in function "public: static class UClass * __cdecl UNetObjectFilter::StaticClass(void)" (?StaticClass@UNetObjectFilter@@SAPEAVUClass@@XZ)
1>Module.UnrealBlox.2.cpp.obj : error LNK2019: unresolved external symbol "public: __cdecl UNetObjectFilter::UNetObjectFilter(class FVTableHelper &)" (??0UNetObjectFilter@@QEAA@AEAVFVTableHelper@@@Z) referenced in function "class UObject * __cdecl InternalVTableHelperCtorCaller<class UBloxNetObjectFilter>(class FVTableHelper &)" (??$InternalVTableHelperCtorCaller@VUBloxNetObjectFilter@@@@YAPEAVUObject@@AEAVFVTableHelper@@@Z)
1>Module.UnrealBlox.2.cpp.obj : error LNK2019: unresolved external symbol "public: virtual __cdecl UNetObjectFilter::~UNetObjectFilter(void)" (??1UNetObjectFilter@@UEAA@XZ) referenced in function "public: virtual __cdecl UBloxNetObjectFilter::~UBloxNetObjectFilter(void)" (??1UBloxNetObjectFilter@@UEAA@XZ)
1>E:\Documents\repos\UnrealBlock\Plugins\UnrealBlox\Binaries\Win64\UnrealEditor-UnrealBlox.dll : fatal error LNK1120: 3 unresolved externals
I’m using the following in my module build.cs:
SetupIrisSupport(Target);
So it is already adding “IrisCore” to the private dependency modules. I also tried adding it to the public dependency modules instead, frantically deleting Intermediates/Binaries and regenerating the VS files for the project along the way, to no avail.
I can also use other classes/typedefs from “Iris/ReplicationSystem/Filtering/NetObjectFilter.h” (such as UE::Net::FNetObjectFilterHandle) without linking errors so I guess the issue lies with the UNetObjectFilter class itself.
Well, now I get an ensure about Iris not finding my class, even though I followed the steps described on the linked page in the OP. I submitted a bug report.
I was able to replicate this in a blank project and still get errors, and I’ve been trying a few times already so unless I made typing errors every time, this just isn’t working.
In my case I wanted to build a filter that kinda acts like the existing spatial grid filter, but optimised for my project (which is cell-based already, so I could make a very efficient custom filter). Using the existing one is okay for now. Putting this here in case this is helpful:
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