osg::Group*
addLights(osg::View* view, osg::Node* root, int lightNum)
{
MapNode* mapNode = MapNode::get(root);
const SpatialReference* mapsrs = mapNode->getMapSRS();
const SpatialReference* geosrs = mapsrs->getGeographicSRS();
osg::Vec3d world;
osg::Group* lights = new osg::Group();
// Add a directional light that simulates the sun - but skip this if a sky
// was already added in the earth file.
if (lightNum == 0)
{
Ephemeris e;
DateTime dt(2016, 8, 10, 14.0);
CelestialBody sun = e.getSunPosition(dt);
world = sun.geocentric;
osg::Light* sunLight = new osg::Light(lightNum++);
world.normalize();
sunLight->setPosition(osg::Vec4d(world, 0.0));
sunLight->setAmbient(osg::Vec4(0.2, 0.2, 0.2, 1.0));
sunLight->setDiffuse(osg::Vec4(1.0, 1.0, 0.9, 1.0));
osg::LightSource* sunLS = new osg::LightSource();
sunLS->setLight(sunLight);
lights->addChild( sunLS );
ShadowCaster* caster = osgEarth::findTopMostNodeOfType<ShadowCaster>(root);
if (caster)
{
OE_INFO << "Found a shadow caster!\n";
caster->setLight(sunLight);
}
}
#if 1
// A red spot light. A spot light has a real position in space
// and points in a specific direciton. The Cutoff and Exponent
// properties control the cone angle and sharpness, respectively
{
GeoPoint p(geosrs, -121, 34, 5000000., ALTMODE_ABSOLUTE);
p.toWorld(world);
osg::Light* spot = new osg::Light(lightNum++);
spot->setPosition(worldToVec4(world));
spot->setAmbient(osg::Vec4(0,0.2,0,1));
spot->setDiffuse(osg::Vec4(1,0,0,1));
spot->setSpotCutoff(20.0f);
spot->setSpotExponent(100.0f);
// point straight down at the map:
world.normalize();
spot->setDirection(-world);
osg::LightSource* spotLS = new osg::LightSource();
spotLS->setLight(spot);
lights->addChild( spotLS );
}
// A green point light. A Point light lives at a real location in
// space and lights equally in all directions.
{
GeoPoint p(geosrs, -45, -35, 1000000., ALTMODE_ABSOLUTE);
p.toWorld(world);
osg::Light* point = new osg::Light(lightNum++);
point->setPosition(worldToVec4(world));
point->setAmbient(osg::Vec4(0,0,0,1));
point->setDiffuse(osg::Vec4(1.0, 1.0, 0.0,1));
osg::LightSource* pointLS = new osg::LightSource();
pointLS->setLight(point);
lights->addChild( pointLS );
}
#endif
// Generate the necessary uniforms for the shaders.
GenerateGL3LightingUniforms gen;
lights->accept(gen);
return lights;
}
