public CSkeletalMesh(USkeletalMesh mesh)
{
OriginalMesh = mesh;
// convert bounds
BoundingSphere = new FSphere
{
R = mesh.Bounds.sphere_radius / 2
};
BoundingBox = new FBox
{
Min = mesh.Bounds.origin - mesh.Bounds.box_extend,
Max = mesh.Bounds.origin + mesh.Bounds.box_extend
};
// MeshScale, MeshOrigin, RotOrigin are removed in UE4
//!! NOTE: MeshScale is integrated into RefSkeleton.RefBonePose[0].Scale3D.
//!! Perhaps rotation/translation are integrated too!
MeshOrigin = new CVec3 {
v = new float[] { 0, 0, 0 }
};
RotOrigin = new FRotator {
pitch = 0, roll = 0, yaw = 0
};
MeshScale = new CVec3 {
v = new float[] { 1, 1, 1 }
};
// convert LODs
Lods = new CSkelMeshLod[mesh.LODModels.Length];
for (int i = 0; i < Lods.Length; i++)
{
var SrcLod = mesh.LODModels[i];
if (SrcLod.Indices.Indices16.Length == 0 && SrcLod.Indices.Indices32.Length == 0)
{
// No indicies in this lod
continue;
}
int NumTexCoords = SrcLod.NumTexCoords;
if (NumTexCoords > 8)
{
throw new FileLoadException($"SkeletalMesh has too many ({NumTexCoords}) UV sets");
}
CSkelMeshLod Lod = new CSkelMeshLod
{
NumTexCoords = NumTexCoords,
HasNormals = true,
HasTangents = true,
};
// get vertex count and determine vertex source
int VertexCount = SrcLod.VertexBufferGPUSkin.GetVertexCount();
bool bUseVerticesFromSections = false;
// if (VertexCount == 0 && SrcLod.Sections.Length > 0 && SrcLod.Sections[0].SoftVertices.Count > 0)
// above is used for editor assets, but there are no chunks for soft vertices
Lod.AllocateVerts(VertexCount);
int chunkIndex = -1;
int lastChunkVertex = -1;
int chunkVertexIndex = 0;
ushort[] BoneMap = null;
for (int j = 0; j < VertexCount; j++)
{
while (j >= lastChunkVertex) // this will fix any issues with empty chunks or sections
{
// UE4.13+ code: chunk information migrated to sections
FSkelMeshSection S = SrcLod.Sections[++chunkIndex];
lastChunkVertex = (int)(S.base_vertex_index + S.num_vertices);
BoneMap = S.bone_map;
chunkVertexIndex = 0;
}
// get vertex from GPU skin
FSkelMeshVertexBase V;
if (!SrcLod.VertexBufferGPUSkin.bUseFullPrecisionUVs)
{
FGPUVert4Half V0 = SrcLod.VertexBufferGPUSkin.VertsHalf[j];
FMeshUVHalf[] SrcUV = V0.UV;
V = new FSkelMeshVertexBase
{
Infs = V0.Infs,
Normal = V0.Normal,
Pos = V0.Pos
};
// UV: convert half -> float
Lod.Verts[j].UV = (FMeshUVFloat)SrcUV[0];
for (int TexCoordIndex = 1; TexCoordIndex < NumTexCoords; TexCoordIndex++)
{
Lod.ExtraUV[TexCoordIndex - 1][j] = (FMeshUVFloat)SrcUV[TexCoordIndex];
}
}
else
{
FGPUVert4Float V0 = SrcLod.VertexBufferGPUSkin.VertsFloat[j];
FMeshUVFloat[] SrcUV = V0.UV;
V = new FSkelMeshVertexBase
{
Infs = V0.Infs,
Normal = V0.Normal,
Pos = V0.Pos
};
// UV: convert half -> float
Lod.Verts[j].UV = SrcUV[0];
for (int TexCoordIndex = 1; TexCoordIndex < NumTexCoords; TexCoordIndex++)
{
Lod.ExtraUV[TexCoordIndex - 1][j] = SrcUV[TexCoordIndex];
}
}
Lod.Verts[j].Position = V.Pos;
Lod.Verts[j].UnpackNormals(V.Normal);
// convert influences
Lod.Verts[j].Bone = new short[4];
int k2 = 0;
uint PackedWeights = 0;
for (int k = 0; k < 4; k++)
{
int BoneIndex = V.Infs.bone_index[k];
byte BoneWeight = V.Infs.bone_weight[k];
if (BoneWeight == 0)
{
continue; // skip this influence (but do not stop the loop!)
}
PackedWeights |= (uint)(BoneWeight << (k2 * 8));
Lod.Verts[j].Bone[k2] = (short)BoneMap[BoneIndex];
k2++;
}
Lod.Verts[j].PackedWeights = PackedWeights;
if (k2 < 4)
{
Lod.Verts[j].Bone[k2] = -1; // mark end of list
}
}
// indices
Lod.Indices.Initialize(SrcLod.Indices.Indices16, SrcLod.Indices.Indices32);
// sections
Lod.Sections = new CMeshSection[SrcLod.Sections.Length];
FSkeletalMeshLODInfo Info = mesh.LODInfo[i];
for (int j = 0; j < SrcLod.Sections.Length; j++)
{
FSkelMeshSection S = SrcLod.Sections[j];
CMeshSection Dst = new CMeshSection();
// remap material for LOD
int MaterialIndex = S.material_index;
if (MaterialIndex >= 0 && MaterialIndex < Info.LODMaterialMap.Length)
{
MaterialIndex = Info.LODMaterialMap[MaterialIndex];
}
if (S.material_index < mesh.Materials.Length)
{
Dst.Material = new UUnrealMaterial();// mesh.Materials[MaterialIndex].Material;
}
// -> TODO: actually get the object from the pak
Dst.FirstIndex = (int)S.base_index;
Dst.NumFaces = (int)S.num_triangles;
Lod.Sections[j] = Dst;
}
Lods[i] = Lod;
}
// copy skeleton
int NumBones = mesh.RefSkeleton.ref_bone_info.Length;
RefSkeleton = new CSkelMeshBone[NumBones];
for (int i = 0; i < NumBones; i++)
{
FMeshBoneInfo B = mesh.RefSkeleton.ref_bone_info[i];
FTransform T = mesh.RefSkeleton.ref_bone_pose[i];
CSkelMeshBone Dst = new CSkelMeshBone
{
Name = B.name,
ParentIndex = B.parent_index,
Position = T.translation,
Orientation = T.rotation
};
// fix skeleton; all bones but 0
if (i >= 1)
{
Dst.Orientation.Conjugate();
}
RefSkeleton[i] = Dst;
}
Sockets = null; // dunno where this is set
FinalizeMesh();
}
static void ExportCommonMeshData(BinaryWriter writer, CMeshSection[] Sections, CSkelMeshVertex[] Verts, CIndexBuffer Indices, CVertexShare Share)
{
VChunkHeader MainHdr = new VChunkHeader(), PtsHdr, WedgHdr, FacesHdr, MatrHdr;
int i;
// main psk header
SAVE_CHUNK(writer, MainHdr, "ACTRHEAD");
PtsHdr = new VChunkHeader
{
DataCount = Share.Points.Count,
DataSize = 12
};
SAVE_CHUNK(writer, PtsHdr, "PNTS0000");
for (i = 0; i < Share.Points.Count; i++)
{
FVector V = Share.Points[i];
V.Y = -V.Y;
V.Write(writer);
}
// get number of faces (some Gears3 meshes may have index buffer larger than needed)
// get wedge-material mapping
int numFaces = 0;
int[] WedgeMat = new int[Verts.Length];
for (i = 0; i < Sections.Length; i++)
{
CMeshSection Sec = Sections[i];
numFaces += Sec.NumFaces;
for (int j = 0; j < Sec.NumFaces * 3; j++)
{
WedgeMat[Indices[j + Sec.FirstIndex]] = i;
}
}
WedgHdr = new VChunkHeader
{
DataCount = Verts.Length,
DataSize = 16
};
SAVE_CHUNK(writer, WedgHdr, "VTXW0000");
for (i = 0; i < Verts.Length; i++)
{
CSkelMeshVertex S = Verts[i];
VVertex W = new VVertex
{
PointIndex = Share.WedgeToVert[i],
U = S.UV.U,
V = S.UV.V,
MatIndex = (byte)WedgeMat[i],
Reserved = 0,
Pad = 0
};
W.Write(writer);
}
if (Verts.Length <= 65536)
{
FacesHdr = new VChunkHeader
{
DataCount = numFaces,
DataSize = 12
};
SAVE_CHUNK(writer, FacesHdr, "FACE0000");
for (i = 0; i < Sections.Length; i++)
{
CMeshSection Sec = Sections[i];
for (int j = 0; j < Sec.NumFaces; j++)
{
VTriangle16 T = new VTriangle16 {
WedgeIndex = new ushort[3]
};
for (int k = 0; k < 3; k++)
{
int idx = (int)Indices[Sec.FirstIndex + j * 3 + k];
if (idx < 0 || idx >= 65536)
{
throw new FileLoadException("Invalid section index");
}
T.WedgeIndex[k] = (ushort)idx;
}
T.MatIndex = (byte)i;
T.AuxMatIndex = 0;
T.SmoothingGroups = 1;
ushort tmp = T.WedgeIndex[0];
T.WedgeIndex[0] = T.WedgeIndex[1];
T.WedgeIndex[1] = tmp;
T.Write(writer);
}
}
}
else
{
// pskx extension
FacesHdr = new VChunkHeader
{
DataCount = numFaces,
DataSize = 18
};
SAVE_CHUNK(writer, FacesHdr, "FACE3200");
for (i = 0; i < Sections.Length; i++)
{
CMeshSection Sec = Sections[i];
for (int j = 0; j < Sec.NumFaces; j++)
{
VTriangle32 T = new VTriangle32 {
WedgeIndex = new int[3]
};
for (int k = 0; k < 3; k++)
{
int idx = (int)Indices[Sec.FirstIndex + j * 3 + k];
T.WedgeIndex[k] = idx;
}
T.MatIndex = (byte)i;
T.AuxMatIndex = 0;
T.SmoothingGroups = 1;
int tmp = T.WedgeIndex[0];
T.WedgeIndex[0] = T.WedgeIndex[1];
T.WedgeIndex[1] = tmp;
T.Write(writer);
}
}
}
MatrHdr = new VChunkHeader
{
DataCount = Sections.Length,
DataSize = 88
};
SAVE_CHUNK(writer, MatrHdr, "MATT0000");
for (i = 0; i < Sections.Length; i++)
{
VMaterial M = new VMaterial {
MaterialName = new byte[64]
};
UUnrealMaterial Tex = Sections[i].Material;
M.TextureIndex = i; // could be required for UT99
//!! this will not handle (UMaterialWithPolyFlags->Material==NULL) correctly - will make MaterialName=="None"
//!! (the same valid for md5mesh export)
Tex = null;
if (Tex != null)
{
//Extensions.StrCpy(M.MaterialName, Tex.Name);
//ExportObject(Tex);
}
else
{
Extensions.StrCpy(M.MaterialName, $"material_{i}");
}
M.Write(writer);
}
}
