Get the plugin working in UE 5.5 Preview.

[kring]

Depends on CesiumGS/cesium-native#977.

Right now, this most likely won't work in any other UE version. But it does work (at least on Windows) in the UE 5.5 Preview that is currently available from the Epic Launcher. It works in all versions now.

[kring]

I fixed the UE 5.5 test failure. The problem was that, when running the tests headless on CI, the Cesium3DTileset::GetCameras was not finding any cameras. And as a result, we were never calling Tileset::updateView. That meant that sampleHeightMostDetailed requests never completed, and eventually the tests would time out. In previous versions of UE, there was a camera of some sort available, even when headless.

I fixed this by calling updateView even if there are no cameras. Tileset tolerates this well enough. I'm a little worried this could impact tile selection, though, leading to some kind of artifact in the Editor. For example, when the Editor loses focus or is minimized, and so none of the Editor viewports are valid, what happens to existing tiles? Well, I tried it, and couldn't see any problems. I'm mentioning it just in case whoever reviews this PR wants to try some additional tests in this areas.

[j9liu]

Thanks @kring ! I'm going to test this locally before I merge, but from a glance there don't appear to be any surprises.

Just a few questions / comments.

[j9liu]

TODO for me: Check out the point cloud vertex factory file for potential updates with the new bool parameter

[j9liu]

@kring I'm not sure why, but updating cesium-native to the latest commit on main is resulting in build errors. It looks like it's a bunch of linker errors with s2?

6>   Creating object C:\Dev\cesium-unreal-samples\Plugins\cesium-unreal\Binaries\Win64\UnrealEditor-CesiumRuntime.exp
6>s2.lib(s2cell_id.cc.obj) : error LNK2019: unresolved external symbol "class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __cdecl absl::lts_20240722::str_format_internal::FormatPack(class absl::lts_20240722::str_format_internal::UntypedFormatSpecImpl,class absl::lts_20240722::Span<class absl::lts_20240722::str_format_internal::FormatArgImpl const >)" (?FormatPack@str_format_internal@lts_20240722@absl@@YA?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@VUntypedFormatSpecImpl@123@V?$Span@$$CBVFormatArgImpl@str_format_internal@lts_20240722@absl@@@23@@Z) referenced in function "public: void __cdecl S2Error::Init<>(enum S2Error::Code,class absl::lts_20240722::str_format_internal::FormatSpecTemplate<> const &)" (??$Init@$$V@S2Error@@QEAAXW4Code@0@AEBV?$FormatSpecTemplate@$S@str_format_internal@lts_20240722@absl@@@Z)
6>s2.lib(s2latlng.cc.obj) : error LNK2001: unresolved external symbol "class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __cdecl absl::lts_20240722::str_format_internal::FormatPack(class absl::lts_20240722::str_format_internal::UntypedFormatSpecImpl,class absl::lts_20240722::Span<class absl::lts_20240722::str_format_internal::FormatArgImpl const >)" (?FormatPack@str_format_internal@lts_20240722@absl@@YA?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@VUntypedFormatSpecImpl@123@V?$Span@$$CBVFormatArgImpl@str_format_internal@lts_20240722@absl@@@23@@Z)
6>s2.lib(s2cell_id.cc.obj) : error LNK2019: unresolved external symbol "unsigned int __cdecl absl::lts_20240722::base_internal::SpinLockWait(struct std::atomic<unsigned int> *,int,struct absl::lts_20240722::base_internal::SpinLockWaitTransition const * const,enum absl::lts_20240722::base_internal::SchedulingMode)" (?SpinLockWait@base_internal@lts_20240722@absl@@YAIPEAU?$atomic@I@std@@HQEBUSpinLockWaitTransition@123@W4SchedulingMode@123@@Z) referenced in function "void __cdecl absl::lts_20240722::base_internal::CallOnceImpl<class <lambda_79ba321403081603635db02b57b3fb8e> >(struct std::atomic<unsigned int> *,enum absl::lts_20240722::base_internal::SchedulingMode,class <lambda_79ba321403081603635db02b57b3fb8e> &&)" (??$CallOnceImpl@V<lambda_79ba321403081603635db02b57b3fb8e>@@$$V@base_internal@lts_20240722@absl@@YAXPEAU?$atomic@I@std@@W4SchedulingMode@012@$$QEAV<lambda_79ba321403081603635db02b57b3fb8e>@@@Z)
6>s2.lib(s2cell_id.cc.obj) : error LNK2019: unresolved external symbol AbslInternalSpinLockWake_lts_20240722 referenced in function "void __cdecl absl::lts_20240722::base_internal::CallOnceImpl<class <lambda_79ba321403081603635db02b57b3fb8e> >(struct std::atomic<unsigned int> *,enum absl::lts_20240722::base_internal::SchedulingMode,class <lambda_79ba321403081603635db02b57b3fb8e> &&)" (??$CallOnceImpl@V<lambda_79ba321403081603635db02b57b3fb8e>@@$$V@base_internal@lts_20240722@absl@@YAXPEAU?$atomic@I@std@@W4SchedulingMode@012@$$QEAV<lambda_79ba321403081603635db02b57b3fb8e>@@@Z)
6>s2.lib(s2cell_id.cc.obj) : error LNK2019: unresolved external symbol "public: void __cdecl absl::lts_20240722::strings_internal::StringifySink::Append(class absl::lts_20240722::string_view)" (?Append@StringifySink@strings_internal@lts_20240722@absl@@QEAAXVstring_view@34@@Z) referenced in function "void __cdecl absl::lts_20240722::AbslStringify<class absl::lts_20240722::strings_internal::StringifySink>(class absl::lts_20240722::strings_internal::StringifySink &,struct absl::lts_20240722::Hex)" (??$AbslStringify@VStringifySink@strings_internal@lts_20240722@absl@@@lts_20240722@absl@@YAXAEAVStringifySink@strings_internal@01@UHex@01@@Z)
6>s2.lib(s2cell_id.cc.obj) : error LNK2019: unresolved external symbol "char * __cdecl absl::lts_20240722::numbers_internal::FastIntToBuffer(int,char *)" (?FastIntToBuffer@numbers_internal@lts_20240722@absl@@YAPEADHPEAD@Z) referenced in function "public: __cdecl absl::lts_20240722::AlphaNum::AlphaNum(int)" (??0AlphaNum@lts_20240722@absl@@QEAA@H@Z)
6>s2.lib(s2cell_id.cc.obj) : error LNK2019: unresolved external symbol "class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __cdecl absl::lts_20240722::StrCat(class absl::lts_20240722::AlphaNum const &,class absl::lts_20240722::AlphaNum const &)" (?StrCat@lts_20240722@absl@@YA?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@AEBVAlphaNum@12@0@Z) referenced in function "public: class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __cdecl S2CellId::ToString(void)const " (?ToString@S2CellId@@QEBA?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@XZ)
6>s2.lib(s2cell_id.cc.obj) : error LNK2001: unresolved external symbol "char const * const absl::lts_20240722::numbers_internal::kHexTable" (?kHexTable@numbers_internal@lts_20240722@absl@@3QBDB)
6>s2.lib(s2latlng.cc.obj) : error LNK2019: unresolved external symbol "public: __cdecl absl::lts_20240722::log_internal::LogMessage::OstreamView::OstreamView(struct absl::lts_20240722::log_internal::LogMessage::LogMessageData &)" (??0OstreamView@LogMessage@log_internal@lts_20240722@absl@@QEAA@AEAULogMessageData@1234@@Z) referenced in function "public: class absl::lts_20240722::log_internal::LogMessage & __cdecl absl::lts_20240722::log_internal::LogMessage::operator<<<class S2LatLng,0>(class S2LatLng const &)" (??$?6VS2LatLng@@$0A@@LogMessage@log_internal@lts_20240722@absl@@QEAAAEAV0123@AEBVS2LatLng@@@Z)
6>s2.lib(s2latlng.cc.obj) : error LNK2019: unresolved external symbol "public: virtual __cdecl absl::lts_20240722::log_internal::LogMessage::OstreamView::~OstreamView(void)" (??1OstreamView@LogMessage@log_internal@lts_20240722@absl@@UEAA@XZ) referenced in function "public: class absl::lts_20240722::log_internal::LogMessage & __cdecl absl::lts_20240722::log_internal::LogMessage::operator<<<class S2LatLng,0>(class S2LatLng const &)" (??$?6VS2LatLng@@$0A@@LogMessage@log_internal@lts_20240722@absl@@QEAAAEAV0123@AEBVS2LatLng@@@Z)
6>s2.lib(s2latlng.cc.obj) : error LNK2019: unresolved external symbol "public: class std::basic_ostream<char,struct std::char_traits<char> > & __cdecl absl::lts_20240722::log_internal::LogMessage::OstreamView::stream(void)" (?stream@OstreamView@LogMessage@log_internal@lts_20240722@absl@@QEAAAEAV?$basic_ostream@DU?$char_traits@D@std@@@std@@XZ) referenced in function "public: class absl::lts_20240722::log_internal::LogMessage & __cdecl absl::lts_20240722::log_internal::LogMessage::operator<<<class S2LatLng,0>(class S2LatLng const &)" (??$?6VS2LatLng@@$0A@@LogMessage@log_internal@lts_20240722@absl@@QEAAAEAV0123@AEBVS2LatLng@@@Z)
6>s2.lib(s2latlng.cc.obj) : error LNK2019: unresolved external symbol "private: void __cdecl absl::lts_20240722::log_internal::LogMessage::CopyToEncodedBuffer<0>(class absl::lts_20240722::string_view)" (??$CopyToEncodedBuffer@$0A@@LogMessage@log_internal@lts_20240722@absl@@AEAAXVstring_view@23@@Z) referenced in function "public: class absl::lts_20240722::log_internal::LogMessage & __cdecl absl::lts_20240722::log_internal::LogMessage::operator<<<34>(char const (&)[34])" (??$?6$0CC@@LogMessage@log_internal@lts_20240722@absl@@QEAAAEAV0123@AEAY0CC@$$CBD@Z)
6>s2.lib(s2latlng.cc.obj) : error LNK2019: unresolved external symbol "private: static bool __cdecl absl::lts_20240722::str_format_internal::FormatArgImpl::Dispatch<double>(union absl::lts_20240722::str_format_internal::FormatArgImpl::Data,class absl::lts_20240722::str_format_internal::FormatConversionSpecImpl,void *)" (??$Dispatch@N@FormatArgImpl@str_format_internal@lts_20240722@absl@@CA_NTData@0123@VFormatConversionSpecImpl@123@PEAX@Z) referenced in function "public: __cdecl absl::lts_20240722::str_format_internal::FormatArgImpl::FormatArgImpl<double>(double const &)" (??$?0N@FormatArgImpl@str_format_internal@lts_20240722@absl@@QEAA@AEBN@Z)
6>s2.lib(coder.cc.obj) : error LNK2019: unresolved external symbol "public: __cdecl absl::lts_20240722::log_internal::LogMessageFatal::LogMessageFatal(char const *,int,class absl::lts_20240722::string_view)" (??0LogMessageFatal@log_internal@lts_20240722@absl@@QEAA@PEBDHVstring_view@23@@Z) referenced in function "public: __cdecl Encoder::~Encoder(void)" (??1Encoder@@QEAA@XZ)
6>s2.lib(coder.cc.obj) : error LNK2019: unresolved external symbol "public: __cdecl absl::lts_20240722::log_internal::LogMessageFatal::~LogMessageFatal(void)" (??1LogMessageFatal@log_internal@lts_20240722@absl@@QEAA@XZ) referenced in function "public: __cdecl Encoder::~Encoder(void)" (??1Encoder@@QEAA@XZ)
6>s2.lib(coder.cc.obj) : error LNK2019: unresolved external symbol "class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > * __cdecl absl::lts_20240722::log_internal::MakeCheckOpString<unsigned char const *,unsigned char const *>(unsigned char const *,unsigned char const *,char const *)" (??$MakeCheckOpString@PEBEPEBE@log_internal@lts_20240722@absl@@YAPEAV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@PEBE0PEBD@Z) referenced in function "class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > * __cdecl absl::lts_20240722::log_internal::Check_LEImpl<unsigned char *,unsigned char *>(unsigned char * const &,unsigned char * const &,char const *)" (??$Check_LEImpl@PEAEPEAE@log_internal@lts_20240722@absl@@YAPEAV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@AEBQEAE0PEBD@Z)
6>C:\Dev\cesium-unreal-samples\Plugins\cesium-unreal\Binaries\Win64\UnrealEditor-CesiumRuntime.dll : fatal error LNK1120: 15 unresolved externals

I made sure to delete the existing build folder in extern, as well as Source/ThirdParty. But seems like this is happening consistently

[lilleyse]

I'm getting similar linker errors when building cesium-native by itself with gcc 13