silverLining light make the stl model white

[cxhaizxm]

Dear everyone, i try to use silverlining sky in osgearth 2.10.2, osg version is 3.6.5. I load the stl model,and adjust the time ,i found the model is very white.like below picture. i try to use the other sky --skynode later, i can get the right effect. I add the material stateset on my model as like below code. I do not know where the problem came from. I am hoping for your help. Thank you for your help.
osg::ref_ptrosg::Material material = new osg::Material;
osg::Vec4 yinbaise(192.0 / 225, 192.0 / 255, 192.0 / 255, 1.0);
material->setAmbient(osg::Material::FRONT, yinbaise);
material->setDiffuse(osg::Material::FRONT, yinbaise);
material->setSpecular(osg::Material::FRONT, yinbaise);
material->setShininess(osg::Material::FRONT, 90.0);
material->setColorMode(osg::Material::AMBIENT);
flyAirport->getOrCreateStateSet()->setAttribute(material.get());
flyAirport->getOrCreateStateSet()->setMode(GL_RESCALE_NORMAL, osg::StateAttribute::ON /| osg::StateAttribute::OVERRIDE/);
flyAirport->getOrCreateStateSet()->setMode(GL_LIGHTING, osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
flyAirport->getOrCreateStateSet()->setMode(GL_LIGHT0, osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
flyAirport->getOrCreateStateSet()->setMode(GL_NORMALIZE, osg::StateAttribute::ON);

white result by using silverlining .

right result by using skynode