osg之显示点云

	/*osg::ref_ptr<osgViewer::Viewer> viewer = new osgViewer::Viewer();
	viewer->addEventHandler(new osgGA::StateSetManipulator(viewer->getCamera()->getOrCreateStateSet()));*/
	osg::ref_ptr<osg::Group> root = new osg::Group();
	
	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 = new osg::Camera;
		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);

		// add this slave camera to the viewer, with a shift left of the projection matrix
		viewer->addSlave(camera.get());
	}

	//创建顶点数组
	osg::ref_ptr<osg::Vec3Array> coords = new osg::Vec3Array();
	osg::ref_ptr<osg::Vec4Array> color = new osg::Vec4Array();

	
	//快速读取文件
	string filePath = "整数.txt";//mcolor_小数  ZSWZ2015111
	FILE* pfData = fopen(filePath.c_str(), "r");

	ifstream fileIn(filePath, ios::in);//读取文件
	string line;//读取了每一行的字符

	getline(fileIn, line);//获取第一行
	stringstream sstr(line);//给他转一下
	string token;

	int lineInNum=0;
	while (getline(sstr, token, ‘ ‘))
	{
		lineInNum ++ ;
		if (lineInNum >= 3)
		{
			if (stof(token)> 1)
			{
				rgbIsInt = true;
			}
	
		}
		
	}

	
	int num = 0;//数据点数量
	if (pfData == NULL)
	{
		cout << "DataFile does not exist!!!" << endl;
		return NULL;
	}
	else
	{
		if (rgbIsInt == false)//读小数
		{ 
			while (!feof(pfData))
			{
				float fx, fy, fz, n, m, k;
				float fa, fb, fc;
				fscanf(pfData, "%f", &fx);
				fscanf(pfData, "%f", &fy);
				fscanf(pfData, "%f", &fz);
				fscanf(pfData, "%f", &fa);
				fscanf(pfData, "%f", &fb);
				fscanf(pfData, "%f", &fc);
				coords->push_back(osg::Vec3(fx, fy, fz));
				color->push_back(osg::Vec4(fa, fb, fc, 1.0f));
				num++;
			}
		}
		else//读整数
		{
			while (!feof(pfData))
			{
				float fx, fy, fz;
				int fa, fb, fc;
				fscanf(pfData, "%f", &fx);
				fscanf(pfData, "%f", &fy);
				fscanf(pfData, "%f", &fz);
				fscanf(pfData, "%d", &fa);
				fscanf(pfData, "%d", &fb);
				fscanf(pfData, "%d", &fc);
				float aa = (float)fa / 255.00;
				float bb = (float)fb / 255.00;
				float cc = (float)fc / 255.00;
				coords->push_back(osg::Vec3(fx, fy, fz));
				color->push_back(osg::Vec4(aa, bb, cc, 1.0f));
				num++;
			}
		}
		fclose(pfData);
	}

	//创建几何体
	osg::ref_ptr<osg::Geometry> geometry = new osg::Geometry();
	//设置顶点数组
	geometry->setVertexArray(coords.get());
	geometry->setColorArray(color.get());
	geometry->setColorBinding(osg::Geometry::BIND_PER_VERTEX);

	osg::Vec3Array *normals = new osg::Vec3Array;
	normals->push_back(osg::Vec3(0.0f, 1.0f, 0.0f));
	//geometry->setNormalArray(normals);
	//geometry->setNormalBinding(osg::Geometry::BIND_OVERALL);
	geometry->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::POINTS, 0, num)); //设置关联方式

	//添加到叶节点
	osg::ref_ptr<osg::Geode> geode = new osg::Geode();
	geode->addDrawable(geometry.get());
	root->addChild(geode.get());

	root->getOrCreateStateSet()->setMode(GL_LIGHTING, StateAttribute::OFF | StateAttribute::OVERRIDE);
	
	//优化场景数据
	osgUtil::Optimizer optimizer;
	optimizer.optimize(root.get());
	viewer->setSceneData(root.get());

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