assimp/code/PlyLoader.cpp

/*
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Open Asset Import Library (assimp)
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*/

/** @file  PlyLoader.cpp
 *  @brief Implementation of the PLY importer class
 */

#ifndef ASSIMP_BUILD_NO_PLY_IMPORTER

// internal headers
#include "PlyLoader.h"
#include "IOStreamBuffer.h"
#include "Macros.h"
#include <memory>
#include <assimp/IOSystem.hpp>
#include <assimp/scene.h>
#include <assimp/importerdesc.h>

using namespace Assimp;

static const aiImporterDesc desc = {
  "Stanford Polygon Library (PLY) Importer",
  "",
  "",
  "",
  aiImporterFlags_SupportBinaryFlavour | aiImporterFlags_SupportTextFlavour,
  0,
  0,
  0,
  0,
  "ply"
};


// ------------------------------------------------------------------------------------------------
// Internal stuff
namespace
{
  // ------------------------------------------------------------------------------------------------
  // Checks that property index is within range
  template <class T>
  const T &GetProperty(const std::vector<T> &props, int idx)
  {
    if (static_cast<size_t>(idx) >= props.size()) {
      throw DeadlyImportError("Invalid .ply file: Property index is out of range.");
    }

    return props[idx];
  }
}


// ------------------------------------------------------------------------------------------------
// Constructor to be privately used by Importer
PLYImporter::PLYImporter()
  : mBuffer()
  , pcDOM()
  , mGeneratedMesh(NULL){
  // empty
}

// ------------------------------------------------------------------------------------------------
// Destructor, private as well
PLYImporter::~PLYImporter() {
  // empty
}

// ------------------------------------------------------------------------------------------------
// Returns whether the class can handle the format of the given file.
bool PLYImporter::CanRead(const std::string& pFile, IOSystem* pIOHandler, bool checkSig) const
{
  const std::string extension = GetExtension(pFile);

  if (extension == "ply")
    return true;
  else if (!extension.length() || checkSig)
  {
    if (!pIOHandler)return true;
    const char* tokens[] = { "ply" };
    return SearchFileHeaderForToken(pIOHandler, pFile, tokens, 1);
  }
  return false;
}

// ------------------------------------------------------------------------------------------------
const aiImporterDesc* PLYImporter::GetInfo() const
{
  return &desc;
}

// ------------------------------------------------------------------------------------------------
static bool isBigEndian(const char* szMe) {
  ai_assert(NULL != szMe);

  // binary_little_endian
  // binary_big_endian
  bool isBigEndian(false);
#if (defined AI_BUILD_BIG_ENDIAN)
  if ( 'l' == *szMe || 'L' == *szMe ) {
    isBigEndian = true;
  }
#else
  if ('b' == *szMe || 'B' == *szMe) {
    isBigEndian = true;
  }
#endif // ! AI_BUILD_BIG_ENDIAN

  return isBigEndian;
}

// ------------------------------------------------------------------------------------------------
// Imports the given file into the given scene structure.
void PLYImporter::InternReadFile(const std::string& pFile,
  aiScene* pScene, IOSystem* pIOHandler)
{
  static const std::string mode = "rb";
  std::unique_ptr<IOStream> fileStream(pIOHandler->Open(pFile, mode));
  if (!fileStream.get()) {
    throw DeadlyImportError("Failed to open file " + pFile + ".");
  }

  // Get the file-size
  size_t fileSize = fileStream->FileSize();

  IOStreamBuffer<char> streamedBuffer(1024 * 1024);
  streamedBuffer.open(fileStream.get());

  // the beginning of the file must be PLY - magic, magic
  std::vector<char> headerCheck;
  streamedBuffer.getNextLine(headerCheck);

  if ((headerCheck.size() >= 3) && (headerCheck[0] != 'P' && headerCheck[0] != 'p') ||
    (headerCheck[1] != 'L' && headerCheck[1] != 'l') ||
    (headerCheck[2] != 'Y' && headerCheck[2] != 'y'))
  {
    streamedBuffer.close();
    throw DeadlyImportError("Invalid .ply file: Magic number \'ply\' is no there");
  }

  std::vector<char> mBuffer2;
  streamedBuffer.getNextLine(mBuffer2);
  mBuffer = (unsigned char*)&mBuffer2[0];

  char* szMe = (char*)&this->mBuffer[0];
  SkipSpacesAndLineEnd(szMe, (const char**)&szMe);

  // determine the format of the file data and construct the aimesh
  PLY::DOM sPlyDom;
  this->pcDOM = &sPlyDom;

  if (TokenMatch(szMe, "format", 6)) {
    if (TokenMatch(szMe, "ascii", 5)) {
      SkipLine(szMe, (const char**)&szMe);
      if (!PLY::DOM::ParseInstance(streamedBuffer, &sPlyDom, this))
      {
        if (mGeneratedMesh != NULL)
          delete(mGeneratedMesh);

        streamedBuffer.close();
        throw DeadlyImportError("Invalid .ply file: Unable to build DOM (#1)");
      }
    }
    else if (!::strncmp(szMe, "binary_", 7))
    {
      szMe += 7;
      const bool bIsBE(isBigEndian(szMe));

      // skip the line, parse the rest of the header and build the DOM
      if (!PLY::DOM::ParseInstanceBinary(streamedBuffer, &sPlyDom, this, bIsBE))
      {
        if (mGeneratedMesh != NULL)
          delete(mGeneratedMesh);

        streamedBuffer.close();
        throw DeadlyImportError("Invalid .ply file: Unable to build DOM (#2)");
      }
    }
    else
    {
      if (mGeneratedMesh != NULL)
        delete(mGeneratedMesh);

      streamedBuffer.close();
      throw DeadlyImportError("Invalid .ply file: Unknown file format");
    }
  }
  else
  {
    AI_DEBUG_INVALIDATE_PTR(this->mBuffer);
    if (mGeneratedMesh != NULL)
      delete(mGeneratedMesh);

    streamedBuffer.close();
    throw DeadlyImportError("Invalid .ply file: Missing format specification");
  }

  //free the file buffer
  streamedBuffer.close();

  if (mGeneratedMesh == NULL)
  {
    throw DeadlyImportError("Invalid .ply file: Unable to extract mesh data ");
  }

  // if no face list is existing we assume that the vertex
  // list is containing a list of points
  bool pointsOnly = mGeneratedMesh->mFaces == NULL ? true : false;
  if (pointsOnly)
  {
    if (mGeneratedMesh->mNumVertices < 3)
    {
      if (mGeneratedMesh != NULL)
        delete(mGeneratedMesh);

      streamedBuffer.close();
      throw DeadlyImportError("Invalid .ply file: Not enough "
        "vertices to build a proper face list. ");
    }

    const unsigned int iNum = (unsigned int)mGeneratedMesh->mNumVertices / 3;
    mGeneratedMesh->mNumFaces = iNum;
    mGeneratedMesh->mFaces = new aiFace[mGeneratedMesh->mNumFaces];

    for (unsigned int i = 0; i < iNum; ++i)
    {
      mGeneratedMesh->mFaces[i].mNumIndices = 3;
      mGeneratedMesh->mFaces[i].mIndices = new unsigned int[3];
      mGeneratedMesh->mFaces[i].mIndices[0] = (i * 3);
      mGeneratedMesh->mFaces[i].mIndices[1] = (i * 3) + 1;
      mGeneratedMesh->mFaces[i].mIndices[2] = (i * 3) + 2;
    }
  }

  // now load a list of all materials
  std::vector<aiMaterial*> avMaterials;
  std::string defaultTexture;
  LoadMaterial(&avMaterials, defaultTexture, pointsOnly);

  // now generate the output scene object. Fill the material list
  pScene->mNumMaterials = (unsigned int)avMaterials.size();
  pScene->mMaterials = new aiMaterial*[pScene->mNumMaterials];
  for (unsigned int i = 0; i < pScene->mNumMaterials; ++i) {
    pScene->mMaterials[i] = avMaterials[i];
  }

  // fill the mesh list
  pScene->mNumMeshes = 1;
  pScene->mMeshes = new aiMesh*[pScene->mNumMeshes];
  pScene->mMeshes[0] = mGeneratedMesh;

  // generate a simple node structure
  pScene->mRootNode = new aiNode();
  pScene->mRootNode->mNumMeshes = pScene->mNumMeshes;
  pScene->mRootNode->mMeshes = new unsigned int[pScene->mNumMeshes];

  for (unsigned int i = 0; i < pScene->mRootNode->mNumMeshes; ++i) {
    pScene->mRootNode->mMeshes[i] = i;
  }
}

void PLYImporter::LoadVertex(const PLY::Element* pcElement, const PLY::ElementInstance* instElement, unsigned int pos)
{
  ai_assert(NULL != pcElement);
  ai_assert(NULL != instElement);

  ai_uint aiPositions[3] = { 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF };
  PLY::EDataType aiTypes[3] = { EDT_Char, EDT_Char, EDT_Char };

  ai_uint aiNormal[3] = { 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF };
  PLY::EDataType aiNormalTypes[3] = { EDT_Char, EDT_Char, EDT_Char };

  unsigned int aiColors[4] = { 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF };
  PLY::EDataType aiColorsTypes[4] = { EDT_Char, EDT_Char, EDT_Char, EDT_Char };

  unsigned int aiTexcoord[2] = { 0xFFFFFFFF, 0xFFFFFFFF };
  PLY::EDataType aiTexcoordTypes[2] = { EDT_Char, EDT_Char };

  unsigned int cnt = 0;

  // now check whether which normal components are available
  unsigned int _a = 0;
  for (std::vector<PLY::Property>::const_iterator a = pcElement->alProperties.begin();
    a != pcElement->alProperties.end(); ++a, ++_a)
  {
    if ((*a).bIsList)continue;

    // Positions
    if (PLY::EST_XCoord == (*a).Semantic)
    {
      cnt++;
      aiPositions[0] = _a;
      aiTypes[0] = (*a).eType;
    }
    else if (PLY::EST_YCoord == (*a).Semantic)
    {
      cnt++;
      aiPositions[1] = _a;
      aiTypes[1] = (*a).eType;
    }
    else if (PLY::EST_ZCoord == (*a).Semantic)
    {
      cnt++;
      aiPositions[2] = _a;
      aiTypes[2] = (*a).eType;
    }

    // Normals
    else if (PLY::EST_XNormal == (*a).Semantic)
    {
      cnt++;
      aiNormal[0] = _a;
      aiNormalTypes[0] = (*a).eType;
    }
    else if (PLY::EST_YNormal == (*a).Semantic)
    {
      cnt++;
      aiNormal[1] = _a;
      aiNormalTypes[1] = (*a).eType;
    }
    else if (PLY::EST_ZNormal == (*a).Semantic)
    {
      cnt++;
      aiNormal[2] = _a;
      aiNormalTypes[2] = (*a).eType;
    }
    // Colors
    else if (PLY::EST_Red == (*a).Semantic)
    {
      cnt++;
      aiColors[0] = _a;
      aiColorsTypes[0] = (*a).eType;
    }
    else if (PLY::EST_Green == (*a).Semantic)
    {
      cnt++;
      aiColors[1] = _a;
      aiColorsTypes[1] = (*a).eType;
    }
    else if (PLY::EST_Blue == (*a).Semantic)
    {
      cnt++;
      aiColors[2] = _a;
      aiColorsTypes[2] = (*a).eType;
    }
    else if (PLY::EST_Alpha == (*a).Semantic)
    {
      cnt++;
      aiColors[3] = _a;
      aiColorsTypes[3] = (*a).eType;
    }
    // Texture coordinates
    else if (PLY::EST_UTextureCoord == (*a).Semantic)
    {
      cnt++;
      aiTexcoord[0] = _a;
      aiTexcoordTypes[0] = (*a).eType;
    }
    else if (PLY::EST_VTextureCoord == (*a).Semantic)
    {
      cnt++;
      aiTexcoord[1] = _a;
      aiTexcoordTypes[1] = (*a).eType;
    }
  }

  // check whether we have a valid source for the vertex data
  if (0 != cnt)
  {
    // Position
    aiVector3D vOut;
    if (0xFFFFFFFF != aiPositions[0])
    {
      vOut.x = PLY::PropertyInstance::ConvertTo<ai_real>(
        GetProperty(instElement->alProperties, aiPositions[0]).avList.front(), aiTypes[0]);
    }

    if (0xFFFFFFFF != aiPositions[1])
    {
      vOut.y = PLY::PropertyInstance::ConvertTo<ai_real>(
        GetProperty(instElement->alProperties, aiPositions[1]).avList.front(), aiTypes[1]);
    }

    if (0xFFFFFFFF != aiPositions[2])
    {
      vOut.z = PLY::PropertyInstance::ConvertTo<ai_real>(
        GetProperty(instElement->alProperties, aiPositions[2]).avList.front(), aiTypes[2]);
    }

    // Normals
    aiVector3D nOut;
    bool haveNormal = false;
    if (0xFFFFFFFF != aiNormal[0])
    {
      nOut.x = PLY::PropertyInstance::ConvertTo<ai_real>(
        GetProperty(instElement->alProperties, aiNormal[0]).avList.front(), aiNormalTypes[0]);
      haveNormal = true;
    }

    if (0xFFFFFFFF != aiNormal[1])
    {
      nOut.y = PLY::PropertyInstance::ConvertTo<ai_real>(
        GetProperty(instElement->alProperties, aiNormal[1]).avList.front(), aiNormalTypes[1]);
      haveNormal = true;
    }

    if (0xFFFFFFFF != aiNormal[2])
    {
      nOut.z = PLY::PropertyInstance::ConvertTo<ai_real>(
        GetProperty(instElement->alProperties, aiNormal[2]).avList.front(), aiNormalTypes[2]);
      haveNormal = true;
    }

    //Colors
    aiColor4D cOut;
    bool haveColor = false;
    if (0xFFFFFFFF != aiColors[0])
    {
      cOut.r = NormalizeColorValue(GetProperty(instElement->alProperties,
        aiColors[0]).avList.front(), aiColorsTypes[0]);
      haveColor = true;
    }

    if (0xFFFFFFFF != aiColors[1])
    {
      cOut.g = NormalizeColorValue(GetProperty(instElement->alProperties,
        aiColors[1]).avList.front(), aiColorsTypes[1]);
      haveColor = true;
    }

    if (0xFFFFFFFF != aiColors[2])
    {
      cOut.b = NormalizeColorValue(GetProperty(instElement->alProperties,
        aiColors[2]).avList.front(), aiColorsTypes[2]);
      haveColor = true;
    }

    // assume 1.0 for the alpha channel ifit is not set
    if (0xFFFFFFFF == aiColors[3])
    {
      cOut.a = 1.0;
    }
    else
    {
      cOut.a = NormalizeColorValue(GetProperty(instElement->alProperties,
        aiColors[3]).avList.front(), aiColorsTypes[3]);

      haveColor = true;
    }

    //Texture coordinates
    aiVector3D tOut;
    tOut.z = 0;
    bool haveTextureCoords = false;
    if (0xFFFFFFFF != aiTexcoord[0])
    {
      tOut.x = PLY::PropertyInstance::ConvertTo<ai_real>(
        GetProperty(instElement->alProperties, aiTexcoord[0]).avList.front(), aiTexcoordTypes[0]);
      haveTextureCoords = true;
    }

    if (0xFFFFFFFF != aiTexcoord[1])
    {
      tOut.y = PLY::PropertyInstance::ConvertTo<ai_real>(
        GetProperty(instElement->alProperties, aiTexcoord[1]).avList.front(), aiTexcoordTypes[1]);
      haveTextureCoords = true;
    }

    //create aiMesh if needed
    if (mGeneratedMesh == NULL)
    {
      mGeneratedMesh = new aiMesh();
      mGeneratedMesh->mMaterialIndex = 0;
    }

    if (mGeneratedMesh->mVertices == NULL)
    {
      mGeneratedMesh->mNumVertices = pcElement->NumOccur;
      mGeneratedMesh->mVertices = new aiVector3D[mGeneratedMesh->mNumVertices];
    }

    mGeneratedMesh->mVertices[pos] = vOut;

    if (haveNormal)
    {
      if (mGeneratedMesh->mNormals == NULL)
        mGeneratedMesh->mNormals = new aiVector3D[mGeneratedMesh->mNumVertices];
      mGeneratedMesh->mNormals[pos] = nOut;
    }

    if (haveColor)
    {
      if (mGeneratedMesh->mColors[0] == NULL)
        mGeneratedMesh->mColors[0] = new aiColor4D[mGeneratedMesh->mNumVertices];
      mGeneratedMesh->mColors[0][pos] = cOut;
    }

    if (haveTextureCoords)
    {
      if (mGeneratedMesh->mTextureCoords[0] == NULL)
      {
        mGeneratedMesh->mNumUVComponents[0] = 2;
        mGeneratedMesh->mTextureCoords[0] = new aiVector3D[mGeneratedMesh->mNumVertices];
      }
      mGeneratedMesh->mTextureCoords[0][pos] = tOut;
    }
  }
}


// ------------------------------------------------------------------------------------------------
// Convert a color component to [0...1]
ai_real PLYImporter::NormalizeColorValue(PLY::PropertyInstance::ValueUnion val,
  PLY::EDataType eType)
{
  switch (eType)
  {
  case EDT_Float:
    return val.fFloat;
  case EDT_Double:
    return (ai_real)val.fDouble;

  case EDT_UChar:
    return (ai_real)val.iUInt / (ai_real)0xFF;
  case EDT_Char:
    return (ai_real)(val.iInt + (0xFF / 2)) / (ai_real)0xFF;
  case EDT_UShort:
    return (ai_real)val.iUInt / (ai_real)0xFFFF;
  case EDT_Short:
    return (ai_real)(val.iInt + (0xFFFF / 2)) / (ai_real)0xFFFF;
  case EDT_UInt:
    return (ai_real)val.iUInt / (ai_real)0xFFFF;
  case EDT_Int:
    return ((ai_real)val.iInt / (ai_real)0xFF) + 0.5f;
  default:;
  };
  return 0.0f;
}

// ------------------------------------------------------------------------------------------------
// Try to extract proper faces from the PLY DOM
void PLYImporter::LoadFace(const PLY::Element* pcElement, const PLY::ElementInstance* instElement, unsigned int pos)
{
  ai_assert(NULL != pcElement);
  ai_assert(NULL != instElement);

  if (mGeneratedMesh == NULL)
    throw DeadlyImportError("Invalid .ply file: Vertices shoud be declared before faces");

  bool bOne = false;

  // index of the vertex index list
  unsigned int iProperty = 0xFFFFFFFF;
  PLY::EDataType eType = EDT_Char;
  bool bIsTriStrip = false;

  // index of the material index property
  //unsigned int iMaterialIndex = 0xFFFFFFFF;
  //PLY::EDataType eType2 = EDT_Char;

  // texture coordinates
  unsigned int iTextureCoord = 0xFFFFFFFF;
  PLY::EDataType eType3 = EDT_Char;

  // face = unique number of vertex indices
  if (PLY::EEST_Face == pcElement->eSemantic)
  {
    unsigned int _a = 0;
    for (std::vector<PLY::Property>::const_iterator a = pcElement->alProperties.begin();
      a != pcElement->alProperties.end(); ++a, ++_a)
    {
      if (PLY::EST_VertexIndex == (*a).Semantic)
      {
        // must be a dynamic list!
        if (!(*a).bIsList)
          continue;

        iProperty = _a;
        bOne = true;
        eType = (*a).eType;
      }
      /*else if (PLY::EST_MaterialIndex == (*a).Semantic)
      {
      if ((*a).bIsList)
      continue;
      iMaterialIndex = _a;
      bOne = true;
      eType2 = (*a).eType;
      }*/
      else if (PLY::EST_TextureCoordinates == (*a).Semantic)
      {
        // must be a dynamic list!
        if (!(*a).bIsList)
          continue;
        iTextureCoord = _a;
        bOne = true;
        eType3 = (*a).eType;
      }
    }
  }
  // triangle strip
  // TODO: triangle strip and material index support???
  else if (PLY::EEST_TriStrip == pcElement->eSemantic)
  {
    unsigned int _a = 0;
    for (std::vector<PLY::Property>::const_iterator a = pcElement->alProperties.begin();
      a != pcElement->alProperties.end(); ++a, ++_a)
    {
      // must be a dynamic list!
      if (!(*a).bIsList)
        continue;
      iProperty = _a;
      bOne = true;
      bIsTriStrip = true;
      eType = (*a).eType;
      break;
    }
  }

  // check whether we have at least one per-face information set
  if (bOne)
  {
    if (mGeneratedMesh->mFaces == NULL)
    {
      mGeneratedMesh->mNumFaces = pcElement->NumOccur;
      mGeneratedMesh->mFaces = new aiFace[mGeneratedMesh->mNumFaces];
    }

    if (!bIsTriStrip)
    {
      // parse the list of vertex indices
      if (0xFFFFFFFF != iProperty)
      {
        const unsigned int iNum = (unsigned int)GetProperty(instElement->alProperties, iProperty).avList.size();
        mGeneratedMesh->mFaces[pos].mNumIndices = iNum;
        mGeneratedMesh->mFaces[pos].mIndices = new unsigned int[iNum];

        std::vector<PLY::PropertyInstance::ValueUnion>::const_iterator p =
          GetProperty(instElement->alProperties, iProperty).avList.begin();

        for (unsigned int a = 0; a < iNum; ++a, ++p)
        {
          mGeneratedMesh->mFaces[pos].mIndices[a] = PLY::PropertyInstance::ConvertTo<unsigned int>(*p, eType);
        }
      }

      // parse the material index
      // cannot be handled without processing the whole file first
      /*if (0xFFFFFFFF != iMaterialIndex)
      {
      mGeneratedMesh->mFaces[pos]. = PLY::PropertyInstance::ConvertTo<unsigned int>(
      GetProperty(instElement->alProperties, iMaterialIndex).avList.front(), eType2);
      }*/

      if (0xFFFFFFFF != iTextureCoord)
      {
        const unsigned int iNum = (unsigned int)GetProperty(instElement->alProperties, iTextureCoord).avList.size();

        //should be 6 coords
        std::vector<PLY::PropertyInstance::ValueUnion>::const_iterator p =
          GetProperty(instElement->alProperties, iTextureCoord).avList.begin();

        if ((iNum / 3) == 2) // X Y coord
        {
          for (unsigned int a = 0; a < iNum; ++a, ++p)
          {
            unsigned int vindex = mGeneratedMesh->mFaces[pos].mIndices[a / 2];
            if (vindex < mGeneratedMesh->mNumVertices)
            {
              if (mGeneratedMesh->mTextureCoords[0] == NULL)
              {
                mGeneratedMesh->mNumUVComponents[0] = 2;
                mGeneratedMesh->mTextureCoords[0] = new aiVector3D[mGeneratedMesh->mNumVertices];
              }

              if (a % 2 == 0)
                mGeneratedMesh->mTextureCoords[0][vindex].x = PLY::PropertyInstance::ConvertTo<ai_real>(*p, eType3);
              else
                mGeneratedMesh->mTextureCoords[0][vindex].y = PLY::PropertyInstance::ConvertTo<ai_real>(*p, eType3);

              mGeneratedMesh->mTextureCoords[0][vindex].z = 0;
            }
          }
        }
      }
    }
    else // triangle strips
    {
      // normally we have only one triangle strip instance where
      // a value of -1 indicates a restart of the strip
      bool flip = false;
      const std::vector<PLY::PropertyInstance::ValueUnion>& quak = GetProperty(instElement->alProperties, iProperty).avList;
      //pvOut->reserve(pvOut->size() + quak.size() + (quak.size()>>2u)); //Limits memory consumption

      int aiTable[2] = { -1, -1 };
      for (std::vector<PLY::PropertyInstance::ValueUnion>::const_iterator a = quak.begin(); a != quak.end(); ++a)  {
        const int p = PLY::PropertyInstance::ConvertTo<int>(*a, eType);

        if (-1 == p)    {
          // restart the strip ...
          aiTable[0] = aiTable[1] = -1;
          flip = false;
          continue;
        }
        if (-1 == aiTable[0]) {
          aiTable[0] = p;
          continue;
        }
        if (-1 == aiTable[1]) {
          aiTable[1] = p;
          continue;
        }

        if (mGeneratedMesh->mFaces == NULL)
        {
          mGeneratedMesh->mNumFaces = pcElement->NumOccur;
          mGeneratedMesh->mFaces = new aiFace[mGeneratedMesh->mNumFaces];
        }

        mGeneratedMesh->mFaces[pos].mNumIndices = 3;
        mGeneratedMesh->mFaces[pos].mIndices = new unsigned int[3];
        mGeneratedMesh->mFaces[pos].mIndices[0] = aiTable[0];
        mGeneratedMesh->mFaces[pos].mIndices[1] = aiTable[1];
        mGeneratedMesh->mFaces[pos].mIndices[2] = aiTable[2];

        if ((flip = !flip)) {
          std::swap(mGeneratedMesh->mFaces[pos].mIndices[0], mGeneratedMesh->mFaces[pos].mIndices[1]);
        }

        aiTable[0] = aiTable[1];
        aiTable[1] = p;
      }
    }
  }
}

// ------------------------------------------------------------------------------------------------
// Get a RGBA color in [0...1] range
void PLYImporter::GetMaterialColor(const std::vector<PLY::PropertyInstance>& avList,
  unsigned int aiPositions[4],
  PLY::EDataType aiTypes[4],
  aiColor4D* clrOut)
{
  ai_assert(NULL != clrOut);

  if (0xFFFFFFFF == aiPositions[0])clrOut->r = 0.0f;
  else
  {
    clrOut->r = NormalizeColorValue(GetProperty(avList,
      aiPositions[0]).avList.front(), aiTypes[0]);
  }

  if (0xFFFFFFFF == aiPositions[1])clrOut->g = 0.0f;
  else
  {
    clrOut->g = NormalizeColorValue(GetProperty(avList,
      aiPositions[1]).avList.front(), aiTypes[1]);
  }

  if (0xFFFFFFFF == aiPositions[2])clrOut->b = 0.0f;
  else
  {
    clrOut->b = NormalizeColorValue(GetProperty(avList,
      aiPositions[2]).avList.front(), aiTypes[2]);
  }

  // assume 1.0 for the alpha channel ifit is not set
  if (0xFFFFFFFF == aiPositions[3])clrOut->a = 1.0f;
  else
  {
    clrOut->a = NormalizeColorValue(GetProperty(avList,
      aiPositions[3]).avList.front(), aiTypes[3]);
  }
}

// ------------------------------------------------------------------------------------------------
// Extract a material from the PLY DOM
void PLYImporter::LoadMaterial(std::vector<aiMaterial*>* pvOut, std::string &defaultTexture, const bool pointsOnly)
{
  ai_assert(NULL != pvOut);

  // diffuse[4], specular[4], ambient[4]
  // rgba order
  unsigned int aaiPositions[3][4] = {

    { 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF },
    { 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF },
    { 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF },
  };

  PLY::EDataType aaiTypes[3][4] = {
    { EDT_Char, EDT_Char, EDT_Char, EDT_Char },
    { EDT_Char, EDT_Char, EDT_Char, EDT_Char },
    { EDT_Char, EDT_Char, EDT_Char, EDT_Char }
  };
  PLY::ElementInstanceList* pcList = NULL;

  unsigned int iPhong = 0xFFFFFFFF;
  PLY::EDataType ePhong = EDT_Char;

  unsigned int iOpacity = 0xFFFFFFFF;
  PLY::EDataType eOpacity = EDT_Char;

  // search in the DOM for a vertex entry
  unsigned int _i = 0;
  for (std::vector<PLY::Element>::const_iterator i = this->pcDOM->alElements.begin();
    i != this->pcDOM->alElements.end(); ++i, ++_i)
  {
    if (PLY::EEST_Material == (*i).eSemantic)
    {
      pcList = &this->pcDOM->alElementData[_i];

      // now check whether which coordinate sets are available
      unsigned int _a = 0;
      for (std::vector<PLY::Property>::const_iterator
        a = (*i).alProperties.begin();
        a != (*i).alProperties.end(); ++a, ++_a)
      {
        if ((*a).bIsList)continue;

        // pohng specularity      -----------------------------------
        if (PLY::EST_PhongPower == (*a).Semantic)
        {
          iPhong = _a;
          ePhong = (*a).eType;
        }

        // general opacity        -----------------------------------
        if (PLY::EST_Opacity == (*a).Semantic)
        {
          iOpacity = _a;
          eOpacity = (*a).eType;
        }

        // diffuse color channels -----------------------------------
        if (PLY::EST_DiffuseRed == (*a).Semantic)
        {
          aaiPositions[0][0] = _a;
          aaiTypes[0][0] = (*a).eType;
        }
        else if (PLY::EST_DiffuseGreen == (*a).Semantic)
        {
          aaiPositions[0][1] = _a;
          aaiTypes[0][1] = (*a).eType;
        }
        else if (PLY::EST_DiffuseBlue == (*a).Semantic)
        {
          aaiPositions[0][2] = _a;
          aaiTypes[0][2] = (*a).eType;
        }
        else if (PLY::EST_DiffuseAlpha == (*a).Semantic)
        {
          aaiPositions[0][3] = _a;
          aaiTypes[0][3] = (*a).eType;
        }
        // specular color channels -----------------------------------
        else if (PLY::EST_SpecularRed == (*a).Semantic)
        {
          aaiPositions[1][0] = _a;
          aaiTypes[1][0] = (*a).eType;
        }
        else if (PLY::EST_SpecularGreen == (*a).Semantic)
        {
          aaiPositions[1][1] = _a;
          aaiTypes[1][1] = (*a).eType;
        }
        else if (PLY::EST_SpecularBlue == (*a).Semantic)
        {
          aaiPositions[1][2] = _a;
          aaiTypes[1][2] = (*a).eType;
        }
        else if (PLY::EST_SpecularAlpha == (*a).Semantic)
        {
          aaiPositions[1][3] = _a;
          aaiTypes[1][3] = (*a).eType;
        }
        // ambient color channels -----------------------------------
        else if (PLY::EST_AmbientRed == (*a).Semantic)
        {
          aaiPositions[2][0] = _a;
          aaiTypes[2][0] = (*a).eType;
        }
        else if (PLY::EST_AmbientGreen == (*a).Semantic)
        {
          aaiPositions[2][1] = _a;
          aaiTypes[2][1] = (*a).eType;
        }
        else if (PLY::EST_AmbientBlue == (*a).Semantic)
        {
          aaiPositions[2][2] = _a;
          aaiTypes[2][2] = (*a).eType;
        }
        else if (PLY::EST_AmbientAlpha == (*a).Semantic)
        {
          aaiPositions[2][3] = _a;
          aaiTypes[2][3] = (*a).eType;
        }
      }
      break;
    }
    else if (PLY::EEST_TextureFile == (*i).eSemantic)
    {
      defaultTexture = (*i).szName;
    }
  }
  // check whether we have a valid source for the material data
  if (NULL != pcList) {
    for (std::vector<ElementInstance>::const_iterator i = pcList->alInstances.begin(); i != pcList->alInstances.end(); ++i)  {
      aiColor4D clrOut;
      aiMaterial* pcHelper = new aiMaterial();

      // build the diffuse material color
      GetMaterialColor((*i).alProperties, aaiPositions[0], aaiTypes[0], &clrOut);
      pcHelper->AddProperty<aiColor4D>(&clrOut, 1, AI_MATKEY_COLOR_DIFFUSE);

      // build the specular material color
      GetMaterialColor((*i).alProperties, aaiPositions[1], aaiTypes[1], &clrOut);
      pcHelper->AddProperty<aiColor4D>(&clrOut, 1, AI_MATKEY_COLOR_SPECULAR);

      // build the ambient material color
      GetMaterialColor((*i).alProperties, aaiPositions[2], aaiTypes[2], &clrOut);
      pcHelper->AddProperty<aiColor4D>(&clrOut, 1, AI_MATKEY_COLOR_AMBIENT);

      // handle phong power and shading mode
      int iMode = (int)aiShadingMode_Gouraud;
      if (0xFFFFFFFF != iPhong)   {
        ai_real fSpec = PLY::PropertyInstance::ConvertTo<ai_real>(GetProperty((*i).alProperties, iPhong).avList.front(), ePhong);

        // if shininess is 0 (and the pow() calculation would therefore always
        // become 1, not depending on the angle), use gouraud lighting
        if (fSpec)  {
          // scale this with 15 ... hopefully this is correct
          fSpec *= 15;
          pcHelper->AddProperty<ai_real>(&fSpec, 1, AI_MATKEY_SHININESS);

          iMode = (int)aiShadingMode_Phong;
        }
      }
      pcHelper->AddProperty<int>(&iMode, 1, AI_MATKEY_SHADING_MODEL);

      // handle opacity
      if (0xFFFFFFFF != iOpacity) {
        ai_real fOpacity = PLY::PropertyInstance::ConvertTo<ai_real>(GetProperty((*i).alProperties, iPhong).avList.front(), eOpacity);
        pcHelper->AddProperty<ai_real>(&fOpacity, 1, AI_MATKEY_OPACITY);
      }

      // The face order is absolutely undefined for PLY, so we have to
      // use two-sided rendering to be sure it's ok.
      const int two_sided = 1;
      pcHelper->AddProperty(&two_sided, 1, AI_MATKEY_TWOSIDED);

      //default texture
      if (!defaultTexture.empty())
      {
        const aiString name(defaultTexture.c_str());
        pcHelper->AddProperty(&name, _AI_MATKEY_TEXTURE_BASE, aiTextureType_DIFFUSE, 0);
      }

      if (!pointsOnly)
      {
        const int two_sided = 1;
        pcHelper->AddProperty(&two_sided, 1, AI_MATKEY_TWOSIDED);
      }

      //set to wireframe, so when using this material info we can switch to points rendering
      if (pointsOnly)
      {
        const int wireframe = 1;
        pcHelper->AddProperty(&wireframe, 1, AI_MATKEY_ENABLE_WIREFRAME);
      }

      // add the newly created material instance to the list
      pvOut->push_back(pcHelper);
    }
  }
  else
  {
    // generate a default material
    aiMaterial* pcHelper = new aiMaterial();

    // fill in a default material
    int iMode = (int)aiShadingMode_Gouraud;
    pcHelper->AddProperty<int>(&iMode, 1, AI_MATKEY_SHADING_MODEL);

    //generate white material most 3D engine just multiply ambient / diffuse color with actual ambient / light color
    aiColor3D clr;
    clr.b = clr.g = clr.r = 1.0f;
    pcHelper->AddProperty<aiColor3D>(&clr, 1, AI_MATKEY_COLOR_DIFFUSE);
    pcHelper->AddProperty<aiColor3D>(&clr, 1, AI_MATKEY_COLOR_SPECULAR);

    clr.b = clr.g = clr.r = 1.0f;
    pcHelper->AddProperty<aiColor3D>(&clr, 1, AI_MATKEY_COLOR_AMBIENT);

    // The face order is absolutely undefined for PLY, so we have to
    // use two-sided rendering to be sure it's ok.
    if (!pointsOnly)
    {
      const int two_sided = 1;
      pcHelper->AddProperty(&two_sided, 1, AI_MATKEY_TWOSIDED);
    }

    //default texture
    if (!defaultTexture.empty())
    {
      const aiString name(defaultTexture.c_str());
      pcHelper->AddProperty(&name, _AI_MATKEY_TEXTURE_BASE, aiTextureType_DIFFUSE, 0);
    }

    //set to wireframe, so when using this material info we can switch to points rendering
    if (pointsOnly)
    {
      const int wireframe = 1;
      pcHelper->AddProperty(&wireframe, 1, AI_MATKEY_ENABLE_WIREFRAME);
    }

    pvOut->push_back(pcHelper);
  }
}

#endif // !! ASSIMP_BUILD_NO_PLY_IMPORTER