Have you played with osg::LightModel state attribute yet?
Maybe enabling/disabling two sided lighting makes a difference.
// Enable two sided lighting
osg::LightModel* lightModel = new osg::LightModel;
lightModel->setTwoSided(true);
stateSet->setAttributeAndModes(lightModel, osg::StateAttribute::ON);
2012/11/21 Matthias Sattler <[email protected]>
> Hi,
>
> I'ld like to have the triangles in the code below drawn colored on both
> sides. As the normals are pointing towards the triangles one side gets
> painted black, even though osg::Material::FRONT_AND_BACK is specified.
> Do you have an idea how I can achieve this?
>
> Thank you!
>
> Cheers,
> Matthias
>
> // Forum problem. Add < in the include lines.
>
> #include osg/Geode>
> #include osg/Geometry>
> #include osg/Material>
> #include osg/Vec3>
> #include osgViewer/Viewer>
>
> osg::Node* createScene()
> {
> osg::Geode* geode = new osg::Geode();
>
> osg::ref_ptr<osg::Vec3Array> shared_normals = new osg::Vec3Array;
> shared_normals->push_back(osg::Vec3(0.0f,-1.0f,0.0f));
>
> {
> osg::Geometry* polyGeom = new osg::Geometry();
>
> osg::Vec3 myCoords[] =
> {
> // note in anticlockwise order.
> osg::Vec3(-1.12056, -2.15188e-09, -0.840418),
> osg::Vec3(-0.95165, -2.15188e-09, -0.840418),
> osg::Vec3(-1.11644, 9.18133e-09, -0.716827),
>
> // note in anticlockwise order.
> osg::Vec3(-0.840418, 9.18133e-09, -0.778623),
> osg::Vec3(-0.622074, 9.18133e-09, -0.613835),
> osg::Vec3(-1.067, 9.18133e-09, -0.609715),
> };
>
> int numCoords = sizeof(myCoords)/sizeof(osg::Vec3);
>
> osg::Vec3Array* vertices = new osg::Vec3Array(numCoords,myCoords);
>
> polyGeom->setVertexArray(vertices);
>
> polyGeom->setNormalArray(shared_normals.get());
> polyGeom->setNormalBinding(osg::Geometry::BIND_OVERALL);
>
> polyGeom->addPrimitiveSet(new
> osg::DrawArrays(osg::PrimitiveSet::TRIANGLES,0,6));
>
> osg::StateSet* stateSet = new osg::StateSet();
>
> osg::Material* material = new osg::Material;
> material->setColorMode(osg::Material::AMBIENT_AND_DIFFUSE);
> material->setAmbient(osg::Material::FRONT_AND_BACK,
> osg::Vec4(1.0, 0.0, 0.0, 1));
> material->setDiffuse(osg::Material::FRONT_AND_BACK,
> osg::Vec4(1.0, 0.0, 0.0, 1));
>
> stateSet->setAttribute(material,
> osg::StateAttribute::OVERRIDE|osg::StateAttribute::ON);
>
> stateSet->setMode(GL_LIGHTING,
> osg::StateAttribute::OVERRIDE|osg::StateAttribute::ON);
> stateSet->setMode(GL_CULL_FACE,
> osg::StateAttribute::OVERRIDE|osg::StateAttribute::OFF);
>
> polyGeom->setStateSet(stateSet);
>
> geode->addDrawable(polyGeom);
> }
>
> return geode;
> }
>
> int main(int, char **)
> {
> osg::Group* root = new osg::Group;
> root->addChild( createScene() );
>
> osgViewer::Viewer viewer;
>
> viewer.setSceneData( root );
>
> return viewer.run();
> }
>
> ------------------
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=51182#51182
>
>
>
>
>
> _______________________________________________
> osg-users mailing list
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>
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