[osg-users] Using Light without LightSource in OSG 3.4.0

[chenyanlin at fulongtech.cn]

Hi,
I want to add light to my scene and I want the different light which have same Number can be used at the same time.Thus , I use light as a Attribute to set it to stateset. There is no problem when the model is not rotate.But when model is rotated, the light seemed rotated by the matrix.There is my source code:
int main()
{
    osg::ref_ptr<osg::Group> root = new osg::Group;
    osg::ref_ptr<osg::Light> light = new osg::Light;
    light->setLightNum(0);
    light->setPosition(osg::Vec4(0, 0, 1, 0));
    light->setAmbient(osg::Vec4(0,0, 0, 1));
    light->setDiffuse(osg::Vec4(0, 1, 0, 1));
    light->setSpecular(osg::Vec4(1, 0, 0, 1));
    auto stateSet = root->getOrCreateStateSet();
    stateSet->setAttributeAndModes(light);
    osg::ref_ptr<osg::TessellationHints> hints = new osg::TessellationHints;
    hints->setDetailRatio(0.1);
    osg::ref_ptr<osg::Geode> geode1 = new osg::Geode;   
    osg::ref_ptr<osg::ShapeDrawable> shape1 = new osg::ShapeDrawable(new     osg::Box(osg::Vec3(0, 0, 0), 10, 10,10), hints.get());
    geode1->addDrawable(shape1);
    osg::ref_ptr<osg::Geode> geode2 = new osg::Geode;
    osg::ref_ptr<osg::ShapeDrawable> shape2 = new osg::ShapeDrawable(new osg::Box(osg::Vec3(20, 20, 20), 10, 10, 10), hints.get());
    geode2->addDrawable(shape2);
    osg::ref_ptr<osg::MatrixTransform> mt = new osg::MatrixTransform;
    osg::Matrix mat;
    mat = mat.rotate(180, osg::Vec3(0, 1, 0));
    mt->setMatrix(mat);
    mt->addChild(geode2);
    root->addChild(mt);
    root->addChild(geode1);
    osgViewer::Viewer myViewer;
    myViewer.setSceneData(root);
    myViewer.run();
    return 0;
}
So,is it the light can be used without LightSource?
Thank you! 


Chenyanlin
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