static void SAVE_CHUNK(BinaryWriter writer, VChunkHeader var, byte[] name)
{
var.ChunkID = new byte[20];
var.TypeFlag = 1999801;
Buffer.BlockCopy(name, 0, var.ChunkID, 0, name.Length > 20 ? 20 : name.Length);
var.Write(writer);
}
static void SAVE_CHUNK(BinaryWriter writer, VChunkHeader var, string name)
{
var.ChunkID = new byte[20];
var.TypeFlag = 1999801;
Extensions.StrCpy(var.ChunkID, name);
var.Write(writer);
}
static void ExportExtraUV(BinaryWriter writer, CMeshUVFloat[][] ExtraUV, int NumVerts, int NumTexCoords)
{
VChunkHeader UVHdr = new VChunkHeader
{
DataCount = NumVerts,
DataSize = 8
};
for (int j = 1; j < NumTexCoords; j++)
{
byte[] chunkName = new byte[32];
Extensions.StrCpy(chunkName, $"EXTRAUVS{j - 1}");
SAVE_CHUNK(writer, UVHdr, chunkName);
}
}
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);
}
}
public static void ExportMesh(BinaryWriter writer, CSkeletalMesh Mesh, CSkelMeshLod Lod)
{
VChunkHeader BoneHdr, InfHdr;
int i, j;
CVertexShare Share = new CVertexShare();
// weld vertices
// The code below differs from similar code for StaticMesh export: it relies on vertex weight
// information to not perform occasional welding of vertices which has the same position and
// normal, but belongs to different bones.
Share.Prepare(Lod.Verts, Lod.NumVerts, 48);
for (i = 0; i < Lod.NumVerts; i++)
{
CSkelMeshVertex S = Lod.Verts[i];
// Here we relies on high possibility that vertices which should be shared between
// triangles will have the same order of weights and bones (because most likely
// these vertices were duplicated by copying). Doing more complicated comparison
// will reduce performance with possibly reducing size of exported mesh by a few
// more vertices.
uint WeightsHash = S.PackedWeights;
for (j = 0; j < S.Bone.Length; j++)
{
WeightsHash ^= (uint)(S.Bone[j] << j);
}
Share.AddVertex(S.Position, S.Normal, WeightsHash);
}
ExportCommonMeshData(writer, Lod.Sections, Lod.Verts, Lod.Indices, Share);
int numBones = Mesh.RefSkeleton.Length;
BoneHdr = new VChunkHeader
{
DataCount = numBones,
DataSize = 120
};
SAVE_CHUNK(writer, BoneHdr, "REFSKELT");
for (i = 0; i < numBones; i++)
{
VBone B = new VBone {
Name = new byte[64]
};
CSkelMeshBone S = Mesh.RefSkeleton[i];
Extensions.StrCpy(B.Name, S.Name);
// count NumChildren
int NumChildren = 0;
for (j = 0; j < numBones; j++)
{
if ((j != i) && (Mesh.RefSkeleton[j].ParentIndex == i))
{
NumChildren++;
}
}
B.NumChildren = NumChildren;
B.ParentIndex = S.ParentIndex;
B.BonePos.Position = S.Position;
B.BonePos.Orientation = S.Orientation;
B.BonePos.Orientation.Y *= -1;
B.BonePos.Orientation.W *= -1;
B.BonePos.Position.Y *= -1;
B.Write(writer);
}
// count influences
int NumInfluences = 0;
for (i = 0; i < Share.Points.Count; i++)
{
int WedgeIndex = Share.VertToWedge[i];
CSkelMeshVertex V = Lod.Verts[WedgeIndex];
for (j = 0; j < 4; j++)
{
if (V.Bone[j] < 0)
{
break;
}
NumInfluences++;
}
}
// write influences
InfHdr = new VChunkHeader
{
DataCount = NumInfluences,
DataSize = 12
};
SAVE_CHUNK(writer, InfHdr, "RAWWEIGHTS");
for (i = 0; i < Share.Points.Count; i++)
{
int WedgeIndex = Share.VertToWedge[i];
CSkelMeshVertex V = Lod.Verts[WedgeIndex];
CVec4 UnpackedWeights = V.UnpackWeights();
for (j = 0; j < 4; j++)
{
if (V.Bone[j] < 0)
{
break;
}
NumInfluences--; // just for verification
VRawBoneInfluence I;
I.Weight = UnpackedWeights.v[j];
I.BoneIndex = V.Bone[j];
I.PointIndex = i;
I.Write(writer);
}
}
if (NumInfluences != 0)
{
throw new FileLoadException("Did not write to all influences");
}
ExportExtraUV(writer, Lod.ExtraUV, Lod.NumVerts, Lod.NumTexCoords);
}