Irrlicht Engine

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Material[0].TextureLayer[1].Texture = CTexture;
Material[0].TextureLayer[1].TextureWrap = video::ETC_CLAMP_TO_EDGE;

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/* .h */
// get position in tiles relative to terrain
bool getTilePos(vector3df pos, u32& x, u32& y);

// get vertex set
bool getVertexSet(u32 x, u32 y, u32 size, vector3df *vertices);

/* .cpp */
bool ShTlTerrainSceneNode::getTilePos(vector3df pos, u32& x, u32& y) {

  x = 0;
  y = 0;

  // get position relative to terrain
  pos = pos - getPosition();
  
  // check if position is outside terrain
  if(pos.X < 0 || pos.X >= (f32)Size.Width*TileSize ||
     pos.Z < 0 || pos.Z >= (f32)Size.Height*TileSize)
    return false;

  // calculate coordinates of tile
  x = (u32) (pos.X / TileSize);
  y = (u32) (pos.Z / TileSize);

  return true;
}

// get set of tiles around tile(x,y)
// fills array with size*size*4 vertices
// returns true on success
bool ShTlTerrainSceneNode::getVertexSet(u32 x, u32 y, u32 size, vector3df *vertices) {
  
  // check if size is even
  if(size % 2 == 0)
    return false;

  // check if pos is outside terrain
  if(x > Size.Width || y > Size.Height)
    return false;

  // "radius" of the set
  u32 o = (size-1)/2;

  // avoid border tiles depending on size
  if(x < o) x = o;
  if(y < o) y = o;
  if(x >= Size.Width-o)  x = Size.Width  -o-1;
  if(y >= Size.Height-o) y = Size.Height -o-1;

  // make tiles
  u32 k = 0;

  for(u32 j = y-o ; j <= y+o; j++) {
    for(u32 i = x-o; i <= x+o; i++) {
      vertices[k++] = vector3df(i*TileSize, Data(i,j).Height, j*TileSize) + getPosition();
      vertices[k++] = vector3df(i*TileSize, Data(i,j+1).Height, (j+1)*TileSize) + getPosition();
      vertices[k++] = vector3df((i+1)*TileSize, Data(i+1,j+1).Height, (j+1)*TileSize) + getPosition();
      vertices[k++] = vector3df((i+1)*TileSize, Data(i+1,j).Height, j*TileSize) + getPosition();
    }
  }

  return true;
}

/* use */
#define COLL_PATCH_SIZE 3

u32 x, y;
if(terrain->getTilePos(YourObject->getPosition(), x, y)) {
  vector3df vertices[COLL_PATCH_SIZE*4];
  if(terrain->getVertexSet(x,y, COLL_PATCH_SIZE, vertices)) {
    // do something with the vertices.
  }
}