[osg-users] different materials for a geometry and highlight
Trajce Nikolov NICK
trajce.nikolov.nick at gmail.com
Mon Sep 26 10:11:16 PDT 2016
Gianni,
you should call geometry->dirtyDisplayList(); at the end of your move
function ... Not sure about the rest of the logic of your code now though
.... Maybe better idea then these email iterations is to write us what is
your goal with this code since I see no smart logic in there (sorry :-) )
void move(osg::Geometry* geometry, unsigned int sourcePrimitiveSetIndex,
unsigned int elementIndex, unsigned int destinationPrimitiveIndex)
{
osg::DrawElementsUInt* sourcePrimitiveSet =
dynamic_cast<osg::DrawElementsUInt*>(geometry->getPrimitiveSet(sourcePrimitiveSetIndex));
osg::DrawElementsUInt* destinationPrimitiveSet =
dynamic_cast<osg::DrawElementsUInt*>(geometry->getPrimitiveSet(destinationPrimitiveIndex));
destinationPrimitiveSet->push_back(sourcePrimitiveSet->at(elementIndex *
3));
destinationPrimitiveSet->push_back(sourcePrimitiveSet->at(elementIndex * 3
+ 1));
destinationPrimitiveSet->push_back(sourcePrimitiveSet->at(elementIndex * 3
+ 2));
sourcePrimitiveSet->erase(sourcePrimitiveSet->begin() + elementIndex * 3);
sourcePrimitiveSet->erase(sourcePrimitiveSet->begin() + elementIndex * 3);
sourcePrimitiveSet->erase(sourcePrimitiveSet->begin() + elementIndex * 3);
sourcePrimitiveSet->dirty();
destinationPrimitiveSet->dirty();
geometry->dirtyDisplayList();
}
On Mon, Sep 26, 2016 at 4:03 PM, Sebastian Messerschmidt <
sebastian.messerschmidt at gmx.de> wrote:
> Hi Gianni,
>
> A very simplistic solution using a outline triangle:
>
>
> <code>
> #include <osg/Geometry>
> #include <osg/Geode>
> #include <osg/MatrixTransform>
> #include <osg/PolygonOffset>
>
> #include <osgViewer/CompositeViewer>
> #include <osgViewer/ViewerEventHandlers>
>
> #include <osgGA/MultiTouchTrackballManipulator>
> #include <osg/PolygonMode>
> #include <osg/LineWidth>
> #include <osgDB/ReadFile>
>
> //#include <osgQt/GraphicsWindowQt>
>
> #include <iostream>
>
> const osg::Vec4 selectedColor(1.0f, 1.0f, 1.0f, 0.5f);
> const osg::Vec4 color1(1.0f, 0.0f, 0.0f, 1.0f);
> const osg::Vec4 color2(0.0f, 1.0f, 0.0f, 1.0f);
> const osg::Vec4 color3(0.0f, 0.0f, 1.0f, 1.0f);
> const osg::Vec4 color4(1.0f, 0.0f, 1.0f, 1.0f);
>
> class SelectModelHandler : public osgGA::GUIEventHandler
> {
> public:
> SelectModelHandler(osg::ref_ptr<osg::Group> group)
> : _selector(0), currentPrimitiveSetIndex(0), _root(group)
> {}
>
> virtual bool handle(const osgGA::GUIEventAdapter& ea,
> osgGA::GUIActionAdapter& aa)
> {
>
> if (ea.getEventType() == osgGA::GUIEventAdapter::RELEASE &&
> ea.getButton() == osgGA::GUIEventAdapter::LEFT_MOUSE_BUTTON &&
> ea.getModKeyMask() & osgGA::GUIEventAdapter::MODKEY_CTRL)
> {
> osgViewer::View* viewer = dynamic_cast<osgViewer::View*>(&aa);
> if (viewer)
> {
> osg::ref_ptr<osgUtil::LineSegmentIntersector> intersector = new
> osgUtil::LineSegmentIntersector(osgUtil::Intersector::WINDOW, ea.getX(),
> ea.getY());
> osgUtil::IntersectionVisitor iv(intersector.get());
> osg::Camera* camera = viewer->getCamera();
> camera->accept(iv);
>
> if (intersector->containsIntersections())
> {
> osgUtil::LineSegmentIntersector::Intersection result
> = *(intersector->getIntersections().begin());
> doUserOperations(result);
> }
> }
> }
>
> return false;
> }
>
> virtual void doUserOperations(osgUtil::Line
> SegmentIntersector::Intersection& result)
> {
> osg::Geometry* geom = dynamic_cast<osg::Geometry*>(r
> esult.drawable.get());
>
> //first solution: add some outline
> if (_root->getNumChildren())
> {
> _root->removeChildren(0, _root->getNumChildren());
> }
> else if (result.indexList.size() > 2)
> {
> osg::DrawElementsUInt* elements = new
> osg::DrawElementsUInt(osg::PrimitiveSet::TRIANGLES);
> osg::Vec3Array* vertices = new osg::Vec3Array;
> osg::Vec4Array* colors = new osg::Vec4Array;
> colors->push_back(osg::Vec4(1, 0, 0, 1));
> const osg::Vec3Array& org_vertices = dynamic_cast<const
> osg::Vec3Array&>(*geom->getVertexArray());
>
> vertices->push_back(org_vertices[result.indexList[0]]);
> vertices->push_back(org_vertices[result.indexList[1]]);
> vertices->push_back(org_vertices[result.indexList[2]]);
> (*elements).push_back(0);
> (*elements).push_back(1);
> (*elements).push_back(2);
>
> osg::Geode* geode = new osg::Geode;
> osg::Geometry* geometry = new osg::Geometry;
> geode->addDrawable(geometry);
> geometry->setVertexArray(vertices);
> geometry->setColorArray(colors, osg::Array::BIND_OVERALL);
> geometry->addPrimitiveSet(elements);
> geometry->getOrCreateStateSet()->setAttribute(new osg::PolygonMode(
> osg::PolygonMode::FRONT_AND_BACK, osg::PolygonMode::LINE));
> geometry->getOrCreateStateSet()->setAttribute(new osg::LineWidth(3.0));
> _root->addChild(geode);
> }
>
>
> }
>
> protected:
> osg::ref_ptr<osg::Geometry> _selector;
> unsigned int currentPrimitiveSetIndex;
> osg::ref_ptr<osg::Group> _root;
> };
>
> osg::Vec3Array* buildVertices() {
> osg::Vec3Array* vertices = new osg::Vec3Array;
> vertices->push_back(osg::Vec3(0, 0, 0));
> vertices->push_back(osg::Vec3(10, 0, 0));
> vertices->push_back(osg::Vec3(10, 10, 0));
> vertices->push_back(osg::Vec3(0, 10, 0));
> vertices->push_back(osg::Vec3(20, 0, 0));
> vertices->push_back(osg::Vec3(20, 10, 0));
> vertices->push_back(osg::Vec3(20, 20, 0));
> vertices->push_back(osg::Vec3(10, 20, 0));
> vertices->push_back(osg::Vec3(0, 20, 0));
> return vertices;
> }
>
> osg::DrawElementsUInt* buildElements()
> {
> osg::DrawElementsUInt* element = new osg::DrawElementsUInt(osg::Pri
> mitiveSet::TRIANGLES);
> element->push_back(0);
> element->push_back(1);
> element->push_back(2);
> element->push_back(0);
> element->push_back(2);
> element->push_back(3);
> //////////////////////////////////////////////////////////////////////////
> element->push_back(1);
> element->push_back(4);
> element->push_back(5);
> element->push_back(1);
> element->push_back(5);
> element->push_back(2);
> //////////////////////////////////////////////////////////////////////////
> element->push_back(2);
> element->push_back(5);
> element->push_back(6);
> element->push_back(2);
> element->push_back(6);
> element->push_back(7);
> //////////////////////////////////////////////////////////////////////////
> element->push_back(3);
> element->push_back(2);
> element->push_back(7);
> element->push_back(3);
> element->push_back(7);
> element->push_back(8);
>
> return element;
> }
>
>
>
> osg::Vec4Array* buildColors() {
> osg::Vec4Array* colors = new osg::Vec4Array(24);
> std::fill(std::begin(*colors), std::end(*colors),
> osg::Vec4f(0.5,0.5,0.5,1.0));
> return colors;
> }
>
> osg::Geometry* buildGeometry() {
> osg::Geometry* geometry = new osg::Geometry;
> geometry->setDataVariance(osg::Object::DYNAMIC);
> geometry->setVertexArray(buildVertices());
> geometry->setColorArray(buildColors(), osg::Array::BIND_PER_VERTEX);
>
> geometry->addPrimitiveSet(buildElements());
>
> return geometry;
> }
>
> osg::Node* createScene() {
> osg::Geode* geode = new osg::Geode;
> geode->addDrawable(buildGeometry());
> return geode;
> }
>
> int main(int argc, char** argv)
> {
> osg::ArgumentParser arguments(&argc, argv);
>
> osgViewer::Viewer viewer(arguments);
> viewer.setUpViewInWindow(0, 0, 1000, 1000, 1);
>
> osg::ref_ptr<osg::Group> root = new osg::Group;
> osg::ref_ptr<osg::Group> selection_root = new osg::Group;
> root->addChild(createScene());
> root->addChild(selection_root);
> osg::ref_ptr<SelectModelHandler> selector = new
> SelectModelHandler(selection_root);
> viewer.setSceneData(root);
> viewer.addEventHandler(selector.get());
> viewer.setCameraManipulator(new osgGA::TrackballManipulator);
>
> // add the window size toggle handler
> viewer.addEventHandler(new osgViewer::WindowSizeHandler);
>
> viewer.run();
> }
> </code>
>
>
>
> Am 9/26/2016 um 3:08 PM schrieb Gianni Ambrosio:
>
>> One question,
>> why should I use a "vertex" shader/attribute when I need to colour a
>> triangle uniformly?
>>
>> Regards,
>> Gianni
>>
>> ------------------
>> Read this topic online here:
>> http://forum.openscenegraph.org/viewtopic.php?p=68753#68753
>>
>>
>>
>>
>>
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>>
>
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--
trajce nikolov nick
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