Eigen与PointCloud(PCL) [英] Eigen with PointCloud (PCL)
问题描述
我一直在关注 http://pointclouds.org/documentation/tutorials/pcl_visualizer.php#pcl-visualizer ,可以使一个简单的查看器正常工作.
I have been following the tutorial http://pointclouds.org/documentation/tutorials/pcl_visualizer.php#pcl-visualizer and could get a simple viewer working.
我查阅了文档,找到了getMatrixXfMap
函数,该函数从PointCloud
返回Eigen::MatrixXf
.
I looked up the documentation and found the function getMatrixXfMap
which returns the Eigen::MatrixXf
from a PointCloud
.
// Get Eigen matrix
Eigen::MatrixXf M = basic_cloud_ptr->getMatrixXfMap();
cout << "(Eigen) #row :" << M.rows() << endl;
cout << "(Eigen) #col :" << M.cols() << endl;
接下来,我处理M
(基本上是旋转,平移和其他一些变换).我如何有效地将M
设置为PointCloud
.还是我一次需要pushback()
一分?
Next I process M
(basically rotations, translations and some other transforms). I how is possible to set M
into the PointCloud
efficiently. Or is it that I need to pushback()
one point at a time?
推荐答案
您无需将pcl云转换为Eigen :: MatrixXF,无需进行转换并重新转换.您只需在输入云上执行即可:
You do not need to cast your pcl cloud to an Eigen::MatrixXF, do the tranformations and cast back. You can simply perform on your input cloud:
pcl::PointCloud<pcl::PointXYZ>::Ptr source_cloud (new pcl::PointCloud<pcl::PointXYZ> ());
\\ Fill the cloud
\\ .....
Eigen::Affine3f transform_2 = Eigen::Affine3f::Identity();
// Define a translation of 2.5 meters on the x axis.
transform_2.translation() << 2.5, 0.0, 0.0;
// The same rotation matrix as before; theta radians arround Z axis
transform_2.rotate (Eigen::AngleAxisf (theta, Eigen::Vector3f::UnitZ()));
// Print the transformation
printf ("\nMethod #2: using an Affine3f\n");
std::cout << transform_2.matrix() << std::endl;
// Executing the transformation
pcl::PointCloud<pcl::PointXYZ>::Ptr transformed_cloud (new pcl::PointCloud<pcl::PointXYZ> ());
// You can either apply transform_1 or transform_2; they are the same
pcl::transformPointCloud (*source_cloud, *transformed_cloud, transform_2);
来自pcl转换教程.
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