Hi all,
I've created terrain using osgTerrain::Terrain, way simialr to that:
osgTerrain::Terrain* Terrain = new osgTerrain::Terrain;
osg::Image* high_map = osgDB::readImageFile( "height.bmp" );
osg::HeightField* heightmap1 = new osg::HeightField;
heightmap1->allocate( RES_X, RES_Y );
heightmap1->setXInterval(10.0f);
heightmap1->setYInterval(10.0f);
for( int z = 0; z < RES_X; z++ )
for( int x = 0; x < RES_Y; x++ )
heightmap1->setHeight( x, z, (float) *high_map->data( x, z ) );
osg::ref_ptr<osgTerrain::Locator> Locator1 = new osgTerrain::Locator;
Locator1->setCoordinateSystemType( osgTerrain::Locator::PROJECTED );
Locator1->setTransformAsExtents( 0.0, 0.0, 2560.0, 2560.0 );
osg::ref_ptr<osgTerrain::HeightFieldLayer> HeightFieldLayer1 = new
osgTerrain::HeightFieldLayer( heightmap1.get() );
HeightFieldLayer1->setLocator( Locator1.get() );
osg::ref_ptr<osgTerrain::TerrainTile> TerrainTile1 = new
osgTerrain::TerrainTile;
TerrainTile1->setElevationLayer( HeightFieldLayer1.get() );
Terrain->setSampleRatio( 1.0f );
osg::ref_ptr<osg::StateSet> m_TerrainStateSet = Terrain->getOrCreateStateSet();
Terrain->addChild( TerrainTile1.get() );
Now i want to create manipulator, which could detect collisions of line segment
with my terrain. I found sample named "pick", where collisions are detected in
pick handler, but it is using computeIntersections() method from Viewer class.
I've tried to analyze computeIntersections() method but i think this is far
ahead of my knowledge of OSG, so i would like to get some explanations or way
how to do that. I'm trying to get terrain geometry (i don't know how :/), than
use osgUtil::IntersectVisitor, but i cannot detect any collisions.
osg::LineSegment* segment = new osg::LineSegment( vec, vec1 );
osgUtil::IntersectVisitor visitor;
osgUtil::Hit hit;
osgUtil::IntersectVisitor::HitList hits;
visitor.addLineSegment( segment );
Terrain->accept( visitor );
hits = visitor.getHitList( segment );
Thank you!
Cheers,
Robert
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Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=32594#32594
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