[osg-users] generate height map using fractal

ami guru dosto.walla at gmail.com
Sun Mar 22 06:45:35 PDT 2009

Hello forum,

I have been using the Paul's article about generating terrain using fractals


I am populating the values in the osg height map structure.

But The rendering is giving me a flat surface.

I hope that Paul sees that as well.


  osg::ref_ptr<osg::Geode> myTerrain = new osg::Geode;

  //Now load the terrain

  osg::ref_ptr<osg::Node> terrainNode (osgDB::readNodeFile("Terrain2.3ds"));

  //generate the 2D fractal
  float *heightData = alloc2DFractArray(512);

  //Define some constants for the fractal terrain
  static const float DEF_HEIGHT_SCALE = 0.1f;
  static float TILING_SURFACE = 3;
  int randomSeed = 1;
  float H = 0.3;
  float iteration = 10;

  fill2DFractArray (heightData,512, randomSeed,DEF_HEIGHT_SCALE,H);

  //using the height field
  osg::ref_ptr<osg::HeightField> heightMap = new osg::HeightField;

  //allocate the space for the height field

  //populate the height map
  for(unsigned int i = 0; i < heightMap->getNumColumns();i++)
      for(unsigned int j = 0; j < heightMap->getNumRows();j++)
      int size = heightMap->getNumRows();

      //std::cout << heightMap->getHeight(i,j) << std::endl;

  //now add the drawable to  the terain
  myTerrain->addDrawable(new osg::ShapeDrawable(heightMap.get()));



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