osg点云加载与渲染

目录

效果

laslib 关键代码

完整代码

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效果

las点云读取使用了laslib这个库。

laslib 关键代码

{// 这里演示读取一个 .txt 点云文件const char* lasfile = path.c_str();std::ifstream ifs;ifs.open(lasfile, std::ios::in | std::ios::binary);liblas::ReaderFactory f;liblas::Reader reader = f.CreateWithStream(ifs);liblas::Header const & header = reader.GetHeader();int count = header.GetPointRecordsCount();int i = 0;while (reader.ReadNextPoint() && i < 10){liblas::Point const& p = reader.GetPoint();double time = p.GetTime();double x = p.GetX();double y = p.GetY();double z = p.GetZ();float intensity = p.GetIntensity();liblas::Color color = p.GetColor();coords->push_back(osg::Vec3(x, y, z));colors->push_back(osg::Vec4(color.GetRed(), color.GetGreen(), color.GetBlue(), 1.0f));cloudNum++;}ifs.close();}

完整代码

osg::ref_ptr<osg::Vec3Array> coords = new osg::Vec3Array();// 创建颜色osg::ref_ptr<osg::Vec4Array> colors = new osg::Vec4Array();/读取点云文件//int cloudNum = 0;{// 这里演示读取一个 .txt 点云文件const char* lasfile = path.c_str();std::ifstream ifs;ifs.open(lasfile, std::ios::in | std::ios::binary);liblas::ReaderFactory f;liblas::Reader reader = f.CreateWithStream(ifs);liblas::Header const & header = reader.GetHeader();int count = header.GetPointRecordsCount();int i = 0;while (reader.ReadNextPoint() && i < 10){liblas::Point const& p = reader.GetPoint();double time = p.GetTime();double x = p.GetX();double y = p.GetY();double z = p.GetZ();float intensity = p.GetIntensity();liblas::Color color = p.GetColor();coords->push_back(osg::Vec3(x, y, z));colors->push_back(osg::Vec4(color.GetRed(), color.GetGreen(), color.GetBlue(), 1.0f));cloudNum++;}ifs.close();}/读取点云文件////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(colors.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);// 设置关联方式geometry->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::POINTS, 0, cloudNum));// 添加到叶节点osg::ref_ptr<osg::Geode> geode = new osg::Geode();osg::ref_ptr<osg::Group> root = new osg::Group();geode->addDrawable(geometry.get());root->addChild(geode.get());