public PositionsNormalsIndicesBinaryStreamWriter AsPNIBinaryStram()
{
PositionsNormalsIndicesBinaryStreamWriter w = new PositionsNormalsIndicesBinaryStreamWriter();
w.FromXbimTriangulatedModelStream(this);
return(w);
}
public void Merge(byte[] GeomData, byte[] TransformData)
{
PositionsNormalsIndicesBinaryStreamWriter.DebugStream(GeomData, false, "in merge");
if (_TransformData == null)
{
_TransformData = TransformData;
}
else
{
if (!_TransformData.SequenceEqual(TransformData))
{
throw new XbimException("Geomtries should share the transformArray for this function to work. Different transform still to be implemented.");
}
}
MemoryStream ms = new MemoryStream(GeomData);
BinaryReader br = new BinaryReader(ms);
UInt32 numPosNormals = br.ReadUInt32();
UInt32 numTriangles = br.ReadUInt32();
iTotPosNormals += numPosNormals;
iTotTriangles += numTriangles;
int numBytesPosAndNormals = (int)(numPosNormals * 24); // 24 = 4 bytes (float32) times the 6 coords (3pos + 3 nrm)
int numBytesTriangs = (int)(numTriangles * 12); // 3 uint per triangle
int iPosAndNormalsBegin = 8;
msPosNormals.Write(GeomData, iPosAndNormalsBegin, numBytesPosAndNormals);
msPosNormals.Flush();
if (iPosNormalOffset > 0) // have to increment the indices
{
ms.Seek(iPosAndNormalsBegin + numBytesPosAndNormals, SeekOrigin.Begin); // goes where the indices begin
BinaryWriter IndexWriter = new BinaryWriter(msIndices);
UInt32 iCnt = 0; //
while (iCnt++ < numTriangles * 3)
{
UInt32 OffsetIndex = br.ReadUInt32() + iPosNormalOffset;
IndexWriter.Write(OffsetIndex);
}
}
else // write the indices as they are
{
msIndices.Write(GeomData, iPosAndNormalsBegin + numBytesPosAndNormals, numBytesTriangs);
}
iPosNormalOffset += numPosNormals;
}
