internal void SaveHeader(EndianBinaryWriter output, bool isIndexed, bool is16Bit)
{
byte sectionFlags = (byte)(
((Obj1StripsCcw.Count != 0) ? 0x01 : 0) |
((Obj1StripsCw.Count != 0) ? 0x02 : 0) |
((Obj2StripsCcw.Count != 0) ? 0x04 : 0) |
((Obj2StripsCw.Count != 0) ? 0x08 : 0));
IEnumerable <GcmfVertex> allVertices = Obj1StripsCcw.Union(Obj1StripsCw)
.Union(Obj2StripsCcw).Union(Obj2StripsCw).SelectMany(sg => sg);
uint vertexFlagsCalc = allVertices.First().VertexFlags;
if (allVertices.All(v => v.VertexFlags != vertexFlagsCalc))
{
throw new InvalidGmaFileException("All vertices within the same mesh must have the same components.");
}
output.Write((uint)RenderFlags);
output.Write(Unk4);
output.Write(Unk8);
output.Write(UnkC);
output.Write(Unk10);
byte calculatedUsedMaterialCount = (byte)(
((PrimaryMaterialIdx != ushort.MaxValue) ? 1 : 0) +
((SecondaryMaterialIdx != ushort.MaxValue) ? 1 : 0) +
((TertiaryMaterialIdx != ushort.MaxValue) ? 1 : 0));
output.Write(calculatedUsedMaterialCount);
output.Write(sectionFlags);
output.Write(Unk14);
output.Write(PrimaryMaterialIdx);
output.Write(SecondaryMaterialIdx);
output.Write(TertiaryMaterialIdx);
output.Write(vertexFlagsCalc);
output.Write(TransformMatrixSpecificIdxsObj1, 0, 8);
if (!isIndexed)
{
output.Write((Obj1StripsCcw.Count != 0) ? Obj1StripsCcw.SizeOfNonIndexed(is16Bit) : 0);
output.Write((Obj1StripsCw.Count != 0) ? Obj1StripsCw.SizeOfNonIndexed(is16Bit) : 0);
}
else
{
// This field contains the number of 32-bit integers instead of the number of bytes, hence the div. by 4
output.Write((Obj1StripsCcw.Count != 0) ? (Obj1StripsCcw.SizeOfIndexed() / 4) : 0);
output.Write((Obj1StripsCw.Count != 0) ? (Obj1StripsCw.SizeOfIndexed() / 4) : 0);
}
output.Write(BoundingSphereCenter.X);
output.Write(BoundingSphereCenter.Y);
output.Write(BoundingSphereCenter.Z);
output.Write(Unk3C);
output.Write(Unk40);
output.Write(0);
output.Write(0);
output.Write(0);
output.Write(0);
output.Write(0);
output.Write(0);
output.Write(0);
}
private void RecalculateBoundingSphere()
{
IEnumerable <GcmfTriangleStrip> allTriangleStrip =
Obj1StripsCcw.Union(Obj1StripsCw).Union(Obj2StripsCcw).Union(Obj2StripsCw);
IEnumerable <GcmfVertex> allVertices = allTriangleStrip.SelectMany(ts => ts);
IEnumerable <Vector3> allVertexPositions = allVertices.Select(v => v.Position);
BoundingSphere boundingSphere = BoundingSphere.FromPoints(allVertexPositions);
BoundingSphereCenter = boundingSphere.Center;
}