struct GeoMipMapPatch { float distance;               // distance of the center of the patch to the eye position (camera) int lod;                      // Patch level of detail bool visible;                 // Tell if the patch is visible (for frustum culling) unsigned int *numVertexIndex; // Number of vertex index per lod    unsigned int **vertexIndex;   // Vertex index in the vertex array for all possible lod};

 // allocate and create all the vertex index for each lod  for (int z=0; z<patchPerSide; ++z) {  for (int x=0; x<patchPerSide; ++x)  {   int index = GetPatch(x,z);   // allocate lodNumber entry (one vertex index for each lod)   patches[index].vertexIndex = new unsigned int*[lodNumber];   totalMem += lodNumber*sizeof(unsigned int*);   patches[index].numVertexIndex = new unsigned int[lodNumber];   totalMem += lodNumber*sizeof(unsigned int);      for (int iLod=0; iLod<lodNumber; ++iLod)   {    // figure out the number of indices we need    int indexSize = 0;    if (iLod==0)    {     indexSize = patchSize;    }    else    {     indexSize = (int)((patchSize/pow(2,iLod))+1);    }    // allocate what we need to store the vertex index'es    patches[index].numVertexIndex[iLod] = SQUARE((indexSize-1)*(indexSize*2));  // indexSize-1 is the number of strips and indexSize*2 the length of a strip    patches[index].vertexIndex[iLod] = new unsigned int[patches[index].numVertexIndex[iLod]];    totalMem += patches[index].numVertexIndex[iLod]*sizeof(unsigned int);        // now tell what are the index'es    logger->Write("LOD:%d\n",iLod);    int vIIndex = 0;    for (int zI=0; zI<patchSize-1; zI+=(iLod+1)) // -1 because we give triangle strips !    {     for (int xI=0; xI<patchSize; xI+=(iLod+1))     {      int xOffset = (x*(patchSize-1))+xI;      int zOffset = (z*(patchSize-1))+zI;      patches[index].vertexIndex[iLod][vIIndex++] = (unsigned int)((zOffset*tData.size)+xOffset);      patches[index].vertexIndex[iLod][vIIndex++] = (unsigned int)(((zOffset+(iLod+1))*tData.size)+xOffset);      logger->Write("%d %d ",patches[index].vertexIndex[iLod][vIIndex-1],patches[index].vertexIndex[iLod][vIIndex]);     }    }    logger->Write("\n\n");   }         // setup the other fields with default values   patches[index].lod = lodNumber;   patches[index].distance = 0.0f;   patches[index].visible = true;  } }