Hi Community,
i have create a polygon by a lot of points by using DelaunayTriangulator, and
now i want to add a limit to make the polygon's outer boundary is a concave
boundary.
here is the test code .but it make no scene. how should i add the limit to
make a concave polygon by using DelaunayTriangulator?
Code:
osg::ref_ptr<osg::Node> createDelu()
{
osg::ref_ptr<osg::Geode> geode = new osg::Geode;
osg::ref_ptr<osg::Geometry> geom = new osg::Geometry;
osg::ref_ptr<osg::Vec3Array> vec = new osg::Vec3Array;
vec->push_back(osg::Vec3(10, 0, 0));
vec->push_back(osg::Vec3(10, 10, 0));
vec->push_back(osg::Vec3(-10, 10, 0));
vec->push_back(osg::Vec3(-10, -10, 0));
vec->push_back(osg::Vec3(0, -3, 0));
vec->push_back(osg::Vec3(-10, 8, 0));
vec->push_back(osg::Vec3(-10, -5, 0));
vec->push_back(osg::Vec3(5, 5, 0));
vec->push_back(osg::Vec3(10, -10, 0));
osg::ref_ptr<osgUtil::DelaunayTriangulator> dt = new
osgUtil::DelaunayTriangulator;
osg::ref_ptr<osgUtil::DelaunayConstraint> dc=new
osgUtil::DelaunayConstraint;
osg::ref_ptr<osg::Vec3Array> vec1 = new osg::Vec3Array;
vec1->push_back(osg::Vec3(10, 0, 0));
vec1->push_back(osg::Vec3(10, 10, 0));
vec1->push_back(osg::Vec3(-10, 10, 0));
vec1->push_back(osg::Vec3(-10, -10, 0));
vec1->push_back(osg::Vec3(0, -3, 0));
vec1->push_back(osg::Vec3(10, -10, 0));
dc->setVertexArray(vec1);
dc->addPrimitiveSet(new
osg::DrawArrays(osg::PrimitiveSet::LINE_STRIP,0,vec1->size()) );
// osg::ref_ptr<osgUtil::Tessellator> tes = new osgUtil::Tessellator();
// tes->setBoundaryOnly(false);
// tes->setWindingType(osgUtil::Tessellator::TESS_WINDING_NONZERO);
// tes->setTessellationType(osgUtil::Tessellator::TESS_TYPE_GEOMETRY);
// tes->retessellatePolygons(*dc);
dt->addInputConstraint(dc.get());
dt->setInputPointArray(vec);
dt->triangulate();
geom->setVertexArray(vec);
geom->addPrimitiveSet(dt->getTriangles());
geode->addDrawable(geom);
return geode;
}
Thank you!
Cheers,
cai
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=57786#57786
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