private void SerializeStreamedData(FArchive Ar, bool bHasVertexColors)
{
var stripDataFlags = Ar.Read <FStripDataFlags>();
Indices = new FMultisizeIndexContainer(Ar);
VertexBufferGPUSkin = new FSkeletalMeshVertexBuffer {
bUseFullPrecisionUVs = true
};
var positionVertexBuffer = new FPositionVertexBuffer(Ar);
var staticMeshVertexBuffer = new FStaticMeshVertexBuffer(Ar);
var skinWeightVertexBuffer = new FSkinWeightVertexBuffer(Ar, VertexBufferGPUSkin.bExtraBoneInfluences);
if (bHasVertexColors)
{
var newColorVertexBuffer = new FColorVertexBuffer(Ar);
ColorVertexBuffer = new FSkeletalMeshVertexColorBuffer(newColorVertexBuffer.Data);
}
if (FUE5ReleaseStreamObjectVersion.Get(Ar) < FUE5ReleaseStreamObjectVersion.Type.RemovingTessellation && !stripDataFlags.IsClassDataStripped((byte)EClassDataStripFlag.CDSF_AdjacencyData))
{
AdjacencyIndexBuffer = new FMultisizeIndexContainer(Ar);
}
if (HasClothData())
{
ClothVertexBuffer = new FSkeletalMeshVertexClothBuffer(Ar);
}
var skinWeightProfilesData = new FSkinWeightProfilesData(Ar);
if (Ar.Game >= EGame.GAME_UE5_0) // Note: This was added in UE4.27, but we're only reading it on UE5 for compatibility with Fortnite
{
var rayTracingData = Ar.ReadArray <byte>();
}
NumVertices = positionVertexBuffer.NumVertices;
NumTexCoords = staticMeshVertexBuffer.NumTexCoords;
VertexBufferGPUSkin.VertsFloat = new FGPUVertFloat[NumVertices];
for (var i = 0; i < VertexBufferGPUSkin.VertsFloat.Length; i++)
{
VertexBufferGPUSkin.VertsFloat[i] = new FGPUVertFloat
{
Pos = positionVertexBuffer.Verts[i],
Infs = skinWeightVertexBuffer.Weights[i],
Normal = staticMeshVertexBuffer.UV[i].Normal,
UV = staticMeshVertexBuffer.UV[i].UV
};
}
}
public FStaticLODModel(FAssetArchive Ar, bool bHasVertexColors) : this()
{
if (Ar.Game == EGame.GAME_SEAOFTHIEVES)
{
Ar.Position += 4;
}
var stripDataFlags = Ar.Read <FStripDataFlags>();
var skelMeshVer = FSkeletalMeshCustomVersion.Get(Ar);
if (Ar.Game == EGame.GAME_SEAOFTHIEVES)
{
Ar.Position += 4;
}
Sections = Ar.ReadArray(Ar.Read <int>(), () => new FSkelMeshSection(Ar));
if (skelMeshVer < FSkeletalMeshCustomVersion.Type.SplitModelAndRenderData)
{
Indices = new FMultisizeIndexContainer(Ar);
}
else
{
// UE4.19+ uses 32-bit index buffer (for editor data)
Indices = new FMultisizeIndexContainer {
Indices32 = Ar.ReadBulkArray <uint>()
};
}
ActiveBoneIndices = Ar.ReadArray <short>();
if (skelMeshVer < FSkeletalMeshCustomVersion.Type.CombineSectionWithChunk)
{
Chunks = Ar.ReadArray(() => new FSkelMeshChunk(Ar));
}
Size = Ar.Read <int>();
if (!stripDataFlags.IsDataStrippedForServer())
{
NumVertices = Ar.Read <int>();
}
RequiredBones = Ar.ReadArray <short>();
if (!stripDataFlags.IsEditorDataStripped())
{
RawPointIndices = new FIntBulkData(Ar);
}
if (Ar.Game != EGame.GAME_SOD2 && Ar.Ver >= UE4Version.VER_UE4_ADD_SKELMESH_MESHTOIMPORTVERTEXMAP)
{
MeshToImportVertexMap = Ar.ReadArray <int>();
MaxImportVertex = Ar.Read <int>();
}
if (!stripDataFlags.IsDataStrippedForServer())
{
NumTexCoords = Ar.Read <int>();
if (skelMeshVer < FSkeletalMeshCustomVersion.Type.SplitModelAndRenderData)
{
VertexBufferGPUSkin = new FSkeletalMeshVertexBuffer(Ar);
if (skelMeshVer >= FSkeletalMeshCustomVersion.Type.UseSeparateSkinWeightBuffer)
{
var skinWeights = new FSkinWeightVertexBuffer(Ar, VertexBufferGPUSkin.bExtraBoneInfluences);
if (skinWeights.Weights.Length > 0)
{
// Copy data to VertexBufferGPUSkin
if (VertexBufferGPUSkin.bUseFullPrecisionUVs)
{
for (var i = 0; i < NumVertices; i++)
{
VertexBufferGPUSkin.VertsFloat[i].Infs = skinWeights.Weights[i];
}
}
else
{
for (var i = 0; i < NumVertices; i++)
{
VertexBufferGPUSkin.VertsHalf[i].Infs = skinWeights.Weights[i];
}
}
}
}
if (bHasVertexColors)
{
if (skelMeshVer < FSkeletalMeshCustomVersion.Type.UseSharedColorBufferFormat)
{
ColorVertexBuffer = new FSkeletalMeshVertexColorBuffer(Ar);
}
else
{
var newColorVertexBuffer = new FColorVertexBuffer(Ar);
ColorVertexBuffer = new FSkeletalMeshVertexColorBuffer(newColorVertexBuffer.Data);
}
}
if (Ar.Ver < UE4Version.VER_UE4_REMOVE_EXTRA_SKELMESH_VERTEX_INFLUENCES)
{
throw new ParserException("Unsupported: extra SkelMesh vertex influences (old mesh format)");
}
// https://github.com/gildor2/UEViewer/blob/master/Unreal/UnrealMesh/UnMesh4.cpp#L1415
if (Ar.Game == EGame.GAME_SOD2)
{
Ar.Position += 8;
return;
}
if (Ar.Game == EGame.GAME_SEAOFTHIEVES)
{
var arraySize = Ar.Read <int>();
Ar.Position += arraySize * 44;
for (var i = 0; i < 4; i++)
{
Ar.ReadArray <int>(); // 4 arrays worth
}
Ar.Position += 13;
}
if (!stripDataFlags.IsClassDataStripped((byte)EClassDataStripFlag.CDSF_AdjacencyData))
{
AdjacencyIndexBuffer = new FMultisizeIndexContainer(Ar);
}
if (Ar.Ver >= UE4Version.VER_UE4_APEX_CLOTH && HasClothData())
{
ClothVertexBuffer = new FSkeletalMeshVertexClothBuffer(Ar);
}
}
}
if (Ar.Game == EGame.GAME_SEAOFTHIEVES)
{
var _ = new FMultisizeIndexContainer(Ar);
}
}
public void SerializeRenderItem(FAssetArchive Ar, bool bHasVertexColors, byte numVertexColorChannels)
{
if (Ar.Game < EGame.GAME_UE4_24)
{
SerializeRenderItem_Legacy(Ar, bHasVertexColors, numVertexColorChannels);
return;
}
var stripDataFlags = Ar.Read <FStripDataFlags>();
var bIsLODCookedOut = Ar.ReadBoolean();
var bInlined = Ar.ReadBoolean();
RequiredBones = Ar.ReadArray <short>();
if (!stripDataFlags.IsDataStrippedForServer() && !bIsLODCookedOut)
{
Sections = new FSkelMeshSection[Ar.Read <int>()];
for (var i = 0; i < Sections.Length; i++)
{
Sections[i] = new FSkelMeshSection();
Sections[i].SerializeRenderItem(Ar);
}
ActiveBoneIndices = Ar.ReadArray <short>();
Ar.Position += 4; //var buffersSize = Ar.Read<uint>();
if (bInlined)
{
SerializeStreamedData(Ar, bHasVertexColors);
if (Ar.Game == EGame.GAME_ROGUECOMPANY)
{
Ar.Position += 10; // FStripDataFlags, ElementSize, ElementCount
Ar.SkipBulkArrayData();
Ar.Position += 10;
}
}
else
{
var bulk = new FByteBulkData(Ar);
if (bulk.Header.ElementCount > 0)
{
using (var tempAr = new FByteArchive("LodReader", bulk.Data, Ar.Versions))
{
SerializeStreamedData(tempAr, bHasVertexColors);
}
var skipBytes = 5;
if (FUE5ReleaseStreamObjectVersion.Get(Ar) < FUE5ReleaseStreamObjectVersion.Type.RemovingTessellation && !stripDataFlags.IsClassDataStripped((byte)EClassDataStripFlag.CDSF_AdjacencyData))
{
skipBytes += 5;
}
skipBytes += 4 * 4 + 2 * 4 + 2 * 4;
skipBytes += FSkinWeightVertexBuffer.MetadataSize(Ar);
Ar.Position += skipBytes;
if (HasClothData())
{
var clothIndexMapping = Ar.ReadArray <long>();
Ar.Position += 2 * 4;
}
var profileNames = Ar.ReadArray(Ar.ReadFName);
}
}
}
}
private void SerializeRenderItem_Legacy(FAssetArchive Ar, bool bHasVertexColors, byte numVertexColorChannels)
{
var stripDataFlags = Ar.Read <FStripDataFlags>();
Sections = new FSkelMeshSection[Ar.Read <int>()];
for (var i = 0; i < Sections.Length; i++)
{
Sections[i] = new FSkelMeshSection();
Sections[i].SerializeRenderItem(Ar);
}
Indices = new FMultisizeIndexContainer(Ar);
VertexBufferGPUSkin = new FSkeletalMeshVertexBuffer {
bUseFullPrecisionUVs = true
};
ActiveBoneIndices = Ar.ReadArray <short>();
RequiredBones = Ar.ReadArray <short>();
if (!stripDataFlags.IsDataStrippedForServer() && !stripDataFlags.IsClassDataStripped((byte)EClassDataStripFlag.CDSF_MinLodData))
{
var positionVertexBuffer = new FPositionVertexBuffer(Ar);
var staticMeshVertexBuffer = new FStaticMeshVertexBuffer(Ar);
var skinWeightVertexBuffer = new FSkinWeightVertexBuffer(Ar, VertexBufferGPUSkin.bExtraBoneInfluences);
if (!bHasVertexColors && Ar.Game == EGame.GAME_BORDERLANDS3)
{
for (var i = 0; i < numVertexColorChannels; i++)
{
var newColorVertexBuffer = new FColorVertexBuffer(Ar);
ColorVertexBuffer = new FSkeletalMeshVertexColorBuffer(newColorVertexBuffer.Data);
}
}
else if (bHasVertexColors)
{
var newColorVertexBuffer = new FColorVertexBuffer(Ar);
ColorVertexBuffer = new FSkeletalMeshVertexColorBuffer(newColorVertexBuffer.Data);
}
if (!stripDataFlags.IsClassDataStripped((byte)EClassDataStripFlag.CDSF_AdjacencyData))
{
AdjacencyIndexBuffer = new FMultisizeIndexContainer(Ar);
}
if (HasClothData())
{
ClothVertexBuffer = new FSkeletalMeshVertexClothBuffer(Ar);
}
NumVertices = positionVertexBuffer.NumVertices;
NumTexCoords = staticMeshVertexBuffer.NumTexCoords;
VertexBufferGPUSkin.VertsFloat = new FGPUVertFloat[NumVertices];
for (var i = 0; i < VertexBufferGPUSkin.VertsFloat.Length; i++)
{
VertexBufferGPUSkin.VertsFloat[i] = new FGPUVertFloat
{
Pos = positionVertexBuffer.Verts[i],
Infs = skinWeightVertexBuffer.Weights[i],
Normal = staticMeshVertexBuffer.UV[i].Normal,
UV = staticMeshVertexBuffer.UV[i].UV
};
}
}
if (Ar.Game >= EGame.GAME_UE4_23)
{
var skinWeightProfilesData = new FSkinWeightProfilesData(Ar);
}
}
// UE ref https://github.com/EpicGames/UnrealEngine/blob/26450a5a59ef65d212cf9ce525615c8bd673f42a/Engine/Source/Runtime/Engine/Private/SkeletalMeshLODRenderData.cpp#L710
public void SerializeRenderItem(FAssetArchive Ar, bool bHasVertexColors, byte numVertexColorChannels)
{
var stripDataFlags = Ar.Read <FStripDataFlags>();
var bIsLODCookedOut = false;
if (Ar.Game != EGame.GAME_Splitgate)
{
bIsLODCookedOut = Ar.ReadBoolean();
}
var bInlined = Ar.ReadBoolean();
RequiredBones = Ar.ReadArray <short>();
if (!stripDataFlags.IsDataStrippedForServer() && !bIsLODCookedOut)
{
Sections = new FSkelMeshSection[Ar.Read <int>()];
for (var i = 0; i < Sections.Length; i++)
{
Sections[i] = new FSkelMeshSection();
Sections[i].SerializeRenderItem(Ar);
}
ActiveBoneIndices = Ar.ReadArray <short>();
if (Ar.Game == EGame.GAME_KenaBridgeofSpirits)
{
Ar.ReadArray <byte>(); // EAssetType_array1
}
Ar.Position += 4; //var buffersSize = Ar.Read<uint>();
if (bInlined)
{
SerializeStreamedData(Ar, bHasVertexColors);
if (Ar.Game == EGame.GAME_RogueCompany)
{
Ar.Position += 12; // 1 (Long) + 2^16 (Int)
var elementSize = Ar.Read <int>();
var elementCount = Ar.Read <int>();
if (elementSize > 0 && elementCount > 0)
{
Ar.SkipBulkArrayData();
}
}
}
else
{
var bulk = new FByteBulkData(Ar);
if (bulk.Header.ElementCount > 0)
{
using (var tempAr = new FByteArchive("LodReader", bulk.Data, Ar.Versions))
{
SerializeStreamedData(tempAr, bHasVertexColors);
}
var skipBytes = 5;
if (FUE5ReleaseStreamObjectVersion.Get(Ar) < FUE5ReleaseStreamObjectVersion.Type.RemovingTessellation && !stripDataFlags.IsClassDataStripped((byte)EClassDataStripFlag.CDSF_AdjacencyData))
{
skipBytes += 5;
}
skipBytes += 4 * 4 + 2 * 4 + 2 * 4;
skipBytes += FSkinWeightVertexBuffer.MetadataSize(Ar);
Ar.Position += skipBytes;
if (HasClothData())
{
var clothIndexMapping = Ar.ReadArray <long>();
Ar.Position += 2 * 4;
}
var profileNames = Ar.ReadArray(Ar.ReadFName);
}
}
}
if (Ar.Game == EGame.GAME_ReadyOrNot)
{
Ar.Position += 4;
}
}