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4959c1f413
Renamed FInstanceSet to FSourceInstanceList in CombineMeshInstances API Added FMeshInstanceGroupData.bPreserveUVs flag, defaults to false, in which case UVs are discarded on simplified and approximate meshes to encourage simplification Added FOptions::MaxAllowableApproximationDeviation, prevents very large deviation in approximation of highly non-convex parts (may break some approximations, might need per-part overrides in future) Added FOptions::bDoubleSidedHiddenRemoval, treating as single-sided improves hidden removal FOptions::ApproximationSourceLOD can now be set to a generated simplified LOD, in addition to Source LODs. This helps avoid approximations being higher-quality than simplified parts In CombineMeshInstancesImpl, renamed FMeshInstanceSet to FMeshPart, FMeshInstance to FMeshPartInstance, FMeshInstanceAssembly to FMeshPartsAssembly, to help clarify internal vs external data structures (many renaming changes as a result) FPartApproxSelector now has MaxAllowableDeviation, set from new FOptions member, prevents major shape deviation (maybe too strict? might be good to count how many things deviate...) tweaked AABB-override of approximations based on volume comparison reduced InitialTriCost scaling for extra approximate LODs in ComputeMeshApproximations - this value is used as an exponent and so if it gets larger than ~5, for large deviations it will basically be infinity and stops being useful. This may need more work as it tends to go to box approximation very quickly now. Various improvements to RemoveHiddenFaces_ExteriorVisibility. Now can backface-cull, does so by FOptions default. Improved filtering around "glancing angle" rays/hits. Changed from using fixed exterior point set as visibility locations, to direction set. Add slight downscaling of UV triangles, and of hit-triangle barycentric coords, to filter out hits very near to triangle edges, which can often be spurious. updated internal usage for renaming, set plausible MaxAllowableApproximationDeviation, and using simplified LODs as ApproximationSourceLOD #rb none #preflight [CL 25546006 by ryan schmidt in ue5-main branch]