Thanks Paul,
I tried to generate the terrain according to your suggestion, and it did work for incremental value multiplied with the value generated by the fractals algorithm. I was scaling the terrain that that is why the terrain looked so flat, so rescale the normal hoping that the fractals will show up propertly. But the same flat surface without the incremental value. Regards Sajjad ---------- Forwarded message ---------- From: Paul Martz <pma...@skew-matrix.com> Date: Sun, Mar 22, 2009 at 11:27 PM Subject: Re: [osg-users] generate height map using fractal To: OpenSceneGraph Users <osg-users@lists.openscenegraph.org> Wow. That article is like 13 years old. I think I wrote it with VC4 and OpenGL 1.1. As a debugging technique, try to separate the heightfield population algorithm from the rendering issue. For example, try populating the heightfield with an array of linearly increasing values and see if it renders as you would expect. If it still renders wrong, then you know the fractal algorithm isn't to blame and the problem is probably with how you are using OSG. As a result, you'll have a much simpler example to post here. I'd also suggest using Geometry instead of some other Drawable, as Geometry is more flexible (you can run them through the Simplifier, for example). Paul Martz *Skew Matrix Software LLC* http://www.skew-matrix.com +1 303 859 9466 ------------------------------ *From:* osg-users-boun...@lists.openscenegraph.org [mailto: osg-users-boun...@lists.openscenegraph.org] *On Behalf Of *ami guru *Sent:* Sunday, March 22, 2009 7:46 AM *To:* OpenSceneGraph Users *Subject:* [osg-users] generate height map using fractal Hello forum, I have been using the Paul's article about generating terrain using fractals http://gameprogrammer.com/fractal.html 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")); terrainScaleMat->addChild(terrainNode.get()); */ //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 heightMap->allocate(512,512); //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(); heightMap->setHeight(i,j,heightData[(i*size)+j]); //std::cout << heightMap->getHeight(i,j) << std::endl; } } //now add the drawable to the terain myTerrain->addDrawable(new osg::ShapeDrawable(heightMap.get())); ******************************************** Regards, Sajjad _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
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