Hi, Guys, I 'm using polyIntersection to pick out points from several thousands of points with their color and locations. I read the points and keep them in a node like this:
///////// osg::ref_ptr<osg::Geometry> geom = new osg::Geometry(); geom->setVertexArray(v.get()); // v is location array geom->setColorArray(clr.get()); // clr is color array geom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::POINTS, 0, v->size())); osg::Geode* geode = new osg::Geode; geode->addDrawable(geom.get()); ///////// What I want to do is draw a rectangle, highlight the points that I've chosen. And if repick part of the highlighted points, remove their highlighted color and show their original colors. I tried Specularhighlights method, which is to define a Specularhilights node and add my points node as its child, like the following code. But this way it change ALL the point's color in the node. ////////// osgFX::SpecularHighlights* scribe = new osgFX::SpecularHighlights(); scribe->addChild(geode); //geode is the original points node parent->replaceChild(node, scribe); //parent is scene root scribe->setSpecularColor(osg::Vec4(0.0, 1.0, 0.0, 1.0f)); //this will change All the points' color ////////// And I found out that the intersections I got from polyIntersection actually have the prrmitiveSet index. So I'm able to trace the node and change the selected points. But the problem is, if I do so, the original color would be overwritten, when I repick, I can not get the original color. Is there a way to do this, just like SpecularHighlights, but only change the premitiveSets in the node that I picked, and be able to get the original colors if got repicked? ... Thank you! Cheers, Yexin :D ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=65112#65112 _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
