osg::Node* CreateScene()
{
osg::Group* pGroup = new osg::Group;
// osg:Light allows us to set default parameter values to be used by osg::LightSource
// note: we do not use light number 0, because we do not want to override the osg default headlights
osg::Light* pLight = new osg::Light;
pLight->setLightNum( 4 );
pLight->setDiffuse( osg::Vec4(1.0f, 0.0f, 0.0f, 1.0f) );
pLight->setPosition( osg::Vec4(1,0,0,0) ); // last param w = 0.0 directional light (direction)
// w = 1.0 point light (position)
// light source
osg::LightSource* pLightSource = new osg::LightSource;
pLightSource->setLight( pLight );
pGroup->addChild( pLightSource );
pGroup->addChild( CreateSpheres( 0 ) );
pGroup->addChild( CreateSpheres( 2 ) );
pGroup->addChild( CreateSpheres( 4 ) );
pGroup->addChild( CreateSpheres( 6 ) );
pGroup->getOrCreateStateSet()->setMode( GL_LIGHT4, osg::StateAttribute::ON );
return pGroup;
}
int main(void)
{
// set up for random num generator
//srand ( time(NULL) );
srand ( 0);
Image img(WINDOW_WIDTH, WINDOW_HEIGHT);
Camera* cam = CameraInit();
PointLight* light = LightInit();
Ray* r = new Ray();
double aspectRatio = WINDOW_WIDTH;
aspectRatio /= WINDOW_HEIGHT;
//SCENE SET UP
// (floor)
Plane* floor = new Plane();
//floor->center = CreatePoint(0, -1 * WINDOW_HEIGHT / 2, -1 * WINDOW_WIDTH / 2);
//floor->color = CreateColor(200, 200, 200);
//floor->normal = CreatePoint(0, 0, -1 * WINDOW_WIDTH / 2);
// (spheres)
Sphere* spheres = CreateSpheres();
// RAY TRACING
//
r->origin = cam->eye;
r->direction = cam->lookAt;
r->direction.x = -1 * aspectRatio * tan(FOV / 2);
for (int i=0; i < WINDOW_WIDTH; i++) {
r->direction.y = tan(FOV / 2);
for (int j=0; j < WINDOW_HEIGHT; j++) {
//Looping over the Rays
img.pixel(i, j, RayTrace(r, spheres, floor, light));
//printf("o: (%lf, %lf, %lf) ", r.origin.x, r.origin.y, r.origin.z);
//printf("d: (%lf, %lf, %lf)\n", r.direction.x, r.direction.y, r.direction.z);
r->direction.y -= 2 * tan(FOV / 2) / WINDOW_HEIGHT;
}
r->direction.x += 2 * tan(FOV / 2) / WINDOW_HEIGHT;
}
// IMAGE OUTPUT
//
// write the targa file to disk
img.WriteTga((char *)"vanilla.tga", true);
// true to scale to max color, false to clamp to 1.0
}
