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OSG height field example

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Texturing and generating a height field

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  1. osg::Node* createHeightField(std::string heightFile, std::string texFile) {
  2.  
  3.     osg::Image* heightMap = osgDB::readImageFile(heightFile);
  4.  
  5.     osg::HeightField* heightField = new osg::HeightField();
  6.     heightField->allocate(heightMap->s(), heightMap->t());
  7.     heightField->setOrigin(osg::Vec3(-heightMap->s() / 2, -heightMap->t() / 2, 0));
  8.     heightField->setXInterval(1.0f);
  9.     heightField->setYInterval(1.0f);
  10.     heightField->setSkirtHeight(1.0f);
  11.  
  12.     for (int r = 0; r < heightField->getNumRows(); r++) {
  13.         for (int c = 0; c < heightField->getNumColumns(); c++) {
  14.             heightField->setHeight(c, r, ((*heightMap->data(c, r)) / 255.0f) * 80.0f);
  15.         }
  16.     }
  17.  
  18.     osg::Geode* geode = new osg::Geode();
  19.     geode->addDrawable(new osg::ShapeDrawable(heightField));
  20.  
  21.     osg::Texture2D* tex = new osg::Texture2D(osgDB::readImageFile(texFile));
  22.     tex->setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::LINEAR_MIPMAP_LINEAR);
  23.     tex->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::LINEAR);
  24.     tex->setWrap(osg::Texture::WRAP_S, osg::Texture::REPEAT);
  25.     tex->setWrap(osg::Texture::WRAP_T, osg::Texture::REPEAT);
  26.     geode->getOrCreateStateSet()->setTextureAttributeAndModes(0, tex);
  27.  
  28.     return geode;
  29. }

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