Changed fallback settings to be largely error based with new property FallbackRelativeError.
Nanite builder will now provide the LOD fallbacks for all autogenerated LOD levels which is far faster than generating them from scratch.
#rb graham.wihlidal
#preflight 61f9e1fe9e4d23cd93b8d556
#ROBOMERGE-AUTHOR: brian.karis
#ROBOMERGE-SOURCE: CL 18820056 in //UE5/Release-5.0/... via CL 18820070 via CL 18822916
#ROBOMERGE-BOT: UE5 (Release-Engine-Test -> Main) (v910-18824042)
[CL 18825066 by brian karis in ue5-main branch]
- Cook side extra low lod coarse mesh will be created at 1/8th of the original coarse mesh if mesh streaming or editor data is available for the platform
- Nanite static meshes with streamable LODs are registered to a Nanite::CoarseMeshStreamingManager which will handle the stream in/out requests for these assets in fixed memory budget (memory budget is part of the total mesh streaming budget)
- Nanite proxy needs to handle different raytracing proxy LOD indices now for dynamic and cached indices
- What to stream is driven by what's used in the TLAS build - each deferred render pass all used streamable meshes are collected and forwarded to the CoarseMeshStreamingManager
- CoarseMeshStreamingManager is updated after all views are rendered and will make stream in/out requests depending on the TLAS usage
- When LODs of UStaticMeshes renderdata is loaded or unloaded then a rebuild of the cached render data is requested to make sure the correct LOD & RT BLAS is used (to do this the UStaticMeshComponent are registered to the UStaticMesh so a request for rebuild can be made for all the proxies on the scene)
#preflight 612659e872e9eb00010a27d9
#ROBOMERGE-SOURCE: CL 17314263
#ROBOMERGE-BOT: (v861-17282326)
[CL 17315687 by kenzo terelst in ue5-main branch]
The Nanite builder now accepts a set of meshes that will be built into a single resource with a hierarchy root for each input mesh.
Updated runtime code to use this feature for Geometry collection.
Each GC now takes up just a single root page.
Changed geometry collection serialization so Nanite data is now transient similar to how it is transient in RenderData for StaticMesh.
Added bogus serialization functions for parsing and throwing away the old Nanite data, so we don't crash when parsing old files.
#rb brian.karis, graham.wihlidal
[CL 14828108 by Rune Stubbe in ue5-main branch]
Fixed tangents not being derived resulting in no welding for mip0 of Nanite
Ignore bHasColor from mesh desc and check if any non-white.
Misc clean up
#rb rune.stubbe
[CL 14223322 by Brian Karis in ue5-main branch]
