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/**
* @file transformations.cpp
* @brief Visualizing cloud in different positions, coordinate frames, camera frustums
* @author Ozan Cagri Tonkal
*/
#include <opencv2/viz.hpp>
#include <iostream>
#include <fstream>
using namespace cv;
using namespace std;
/**
* @function help
* @brief Display instructions to use this tutorial program
*/
static void help()
{
cout
<< "--------------------------------------------------------------------------" << endl
<< "This program shows how to use makeTransformToGlobal() to compute required pose,"
<< "how to use makeCameraPose and Viz3d::setViewerPose. You can observe the scene "
<< "from camera point of view (C) or global point of view (G)" << endl
<< "Usage:" << endl
<< "./transformations [ G | C ]" << endl
<< endl;
}
/**
* @function cvcloud_load
* @brief load bunny.ply
*/
static Mat cvcloud_load()
{
Mat cloud(1, 1889, CV_32FC3);
ifstream ifs("bunny.ply");
string str;
for(size_t i = 0; i < 12; ++i)
getline(ifs, str);
Point3f* data = cloud.ptr<cv::Point3f>();
float dummy1, dummy2;
for(size_t i = 0; i < 1889; ++i)
ifs >> data[i].x >> data[i].y >> data[i].z >> dummy1 >> dummy2;
cloud *= 5.0f;
return cloud;
}
/**
* @function main
*/
int main(int argn, char **argv)
{
help();
if (argn < 2)
{
cout << "Missing arguments." << endl;
return 1;
}
bool camera_pov = (argv[1][0] == 'C');
/// Create a window
viz::Viz3d myWindow("Coordinate Frame");
/// Add coordinate axes
myWindow.showWidget("Coordinate Widget", viz::WCoordinateSystem());
/// Let's assume camera has the following properties
Vec3f cam_pos(3.0f,3.0f,3.0f), cam_focal_point(3.0f,3.0f,2.0f), cam_y_dir(-1.0f,0.0f,0.0f);
/// We can get the pose of the cam using makeCameraPose
Affine3f cam_pose = viz::makeCameraPose(cam_pos, cam_focal_point, cam_y_dir);
/// We can get the transformation matrix from camera coordinate system to global using
/// - makeTransformToGlobal. We need the axes of the camera
Affine3f transform = viz::makeTransformToGlobal(Vec3f(0.0f,-1.0f,0.0f), Vec3f(-1.0f,0.0f,0.0f), Vec3f(0.0f,0.0f,-1.0f), cam_pos);
/// Create a cloud widget.
Mat bunny_cloud = cvcloud_load();
viz::WCloud cloud_widget(bunny_cloud, viz::Color::green());
/// Pose of the widget in camera frame
Affine3f cloud_pose = Affine3f().translate(Vec3f(0.0f,0.0f,3.0f));
/// Pose of the widget in global frame
Affine3f cloud_pose_global = transform * cloud_pose;
/// Visualize camera frame
if (!camera_pov)
{
viz::WCameraPosition cpw(0.5); // Coordinate axes
viz::WCameraPosition cpw_frustum(Vec2f(0.889484, 0.523599)); // Camera frustum
myWindow.showWidget("CPW", cpw, cam_pose);
myWindow.showWidget("CPW_FRUSTUM", cpw_frustum, cam_pose);
}
/// Visualize widget
myWindow.showWidget("bunny", cloud_widget, cloud_pose_global);
/// Set the viewer pose to that of camera
if (camera_pov)
myWindow.setViewerPose(cam_pose);
/// Start event loop.
myWindow.spin();
return 0;
}
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