Hi,
I'm studying OSG with Beginner's Guide Book.
But I did not learn about OpenGL.
First, let me show you the code related questions.
Code:
#include <osg/MatrixTransform>
#include <osg/LightSource>
#include <osgDB/ReadFile>
#include <osgViewer/Viewer>
osg::Node* createLightSource( unsigned int num,
const osg::Vec3& trans,
const osg::Vec4&
color )
{
osg::ref_ptr<osg::Light> light = new osg::Light;
light->setLightNum( num );
light->setDiffuse( color );
light->setPosition( osg::Vec4( 0.0f, 0.0f, 0.0f, 1.0f ) );
osg::ref_ptr<osg::LightSource> lightSource = new osg::LightSource;
lightSource->setLight( light );
osg::ref_ptr<osg::MatrixTransform> sourceTrans = new
osg::MatrixTransform;
sourceTrans->setMatrix( osg::Matrix::translate( trans ) );
sourceTrans->addChild( lightSource.get() );
return sourceTrans.release();
}
int main( int argc, char** argv )
{
osg::ref_ptr<osg::Node> model = osgDB::readNodeFile( "cessna.osg" );
osg::ref_ptr<osg::Group> root = new osg::Group;
root->addChild( model.get() );
osg::Node* light0 = createLightSource( 0, osg::Vec3( -20.0f, 0.0f,
0.0f ), osg::Vec4( 1.0f, 1.0f, 0.0f, 1.0f ) );
osg::Node* light1 = createLightSource( 1, osg::Vec3( 0.0f, -20.0f,
0.0f ), osg::Vec4( 0.0f, 1.0f, 1.0f, 1.0f ) );
root->getOrCreateStateSet()->setMode( GL_LIGHT0,
osg::StateAttribute::ON );
root->getOrCreateStateSet()->setMode( GL_LIGHT1,
osg::StateAttribute::ON );
root->addChild( light0 );
root->addChild( light1 );
osgViewer::Viewer viewer;
viewer.setSceneData( root.get() );
return viewer.run();
}
In the code, GL_LIGHT0 and GL_LIGHT1 is being used.
I know there are from GL_LIGHT0 to GL_LIGHT7.
In my opinion GL_LIGHT0 features seems to be different from others.
Who can you explain GL_LIGHT0 is this?
...
Thank you!
Cheers,
YoungStone,
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=48576#48576
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