OSG粒子系统与阴影-爆炸模拟（3）

爆炸模拟示例

爆炸模拟示例的代码如程序清单11-4 所示：

/* 爆炸模拟示例 */
void explosion_11_4()
{
	osg::ref_ptr<osgViewer::Viewer> viewer = new osgViewer::Viewer();
	osg::ref_ptr<osg::GraphicsContext::Traits> traits = new osg::GraphicsContext::Traits;
	traits->x = 40;
	traits->y = 40;
	traits->width = 600;
	traits->height = 480;
	traits->windowDecoration = true;
	traits->doubleBuffer = true;
	traits->sharedContext = 0;

	osg::ref_ptr<osg::GraphicsContext> gc = osg::GraphicsContext::createGraphicsContext(traits.get());

	osg::ref_ptr<osg::Camera> camera = viewer->getCamera();
	camera->setGraphicsContext(gc.get());
	camera->setViewport(new osg::Viewport(0, 0, traits->width, traits->height));
	GLenum buffer = traits->doubleBuffer ? GL_BACK : GL_FRONT;
	camera->setDrawBuffer(buffer);
	camera->setReadBuffer(buffer);

	osg::ref_ptr<osg::Group> root = new osg::Group();

	// 添加爆炸效果
	root->addChild(createExplode());

	// 优化场景数据
	osgUtil::Optimizer optimize;
	optimize.optimize(root.get());

	viewer->setSceneData(root.get());

	viewer->realize();
	viewer->run();
}

// 创建爆炸效果
osg::ref_ptr<osg::Node> createExplode()
{
	osg::ref_ptr<osg::Group> explode = new osg::Group();

	// 风向
	osg::Vec3 wind(1.0, 0.0, 0.0);

	// 位置
	osg::Vec3 position(0.0, 0.0, -10.0);

	// 爆炸模拟，10.0为缩放比，默认为1.0，不缩放
	osg::ref_ptr<osgParticle::ExplosionEffect> explosion = new osgParticle::ExplosionEffect(position,10.0);

	// 碎片模拟
	osg::ref_ptr<osgParticle::ExplosionDebrisEffect> explosionDebri = new osgParticle::ExplosionDebrisEffect(position, 10.0);

	// 烟模拟
	osg::ref_ptr<osgParticle::SmokeEffect> smoke = new osgParticle::SmokeEffect(position, 10.0);

	// 火焰模拟
	osg::ref_ptr<osgParticle::FireEffect> fire = new osgParticle::FireEffect(position, 10.0);

	// 设置风向
	explosion->setWind(wind);
	explosionDebri->setWind(wind);
	smoke->setWind(wind);
	fire->setWind(wind);

	// 添加子节点
	explode->addChild(explosion.get());
	explode->addChild(explosionDebri.get());
	explode->addChild(smoke.get());
	explode->addChild(fire.get());

	return explode.get();
}

运行程序，截图如图11-6 所示