Graphing 3D Plot with C++ GNUPlot? (C++ 14, VS 22) - c++

Question

I'm attempting to plot a set of 3D points in C++ using the GNUPlot library implementation.
I'm using C++ 14 with Visual Studio 2022.
I understand how to plot 2D points with this library, however I'm quite confused as to how I'm supposed to plot a set of 3D points.
Let's say my 3D points are (0, 0, 0), (1, 1, 1), and (2, 2, 2).
One of the things I tried was to create a vector for each 3D point.
I tried the following example code from the GNUPlot examples page:
#include <string>
#include "gnuplot-iostream.h"
using namespace std;
int main()
{
vector<vector<float>> data = {};
data.push_back(vector<float>{0, 0, 0});
data.push_back(vector<float>{1, 1, 1});
data.push_back(vector<float>{2, 2, 2});
Gnuplot gp;
gp << "set title 'test'\n";
gp << "set dgrid3d 30,30\n";
gp << "set hidden3d\n";
gp << "splot" << gp.file1d(data) << "u 1:2:3 with lines title 'test'" << std::endl;
return 0;
}
However that gives me the following plot:
I also tried to create a dedicated struct for the 3D points, however that resulted in an error from the GNUPlot header file.
When I would graph 2D points, I would use the std::pair datatype for representing the points, so what datatype should I use to represent 3D points?
Thank you for reading my post, any guidance is appreciated.

Answer 1

It was much simpler than expected, simply removing dgrid3d and replacing lines with points appears to do the trick (thanks ypnos):
#include <string>
#include "gnuplot-iostream.h"
using namespace std;
int main()
{
vector<vector<float>> data = {};
data.push_back(vector<float>{0, 0, 0});
data.push_back(vector<float>{1, 1, 1});
data.push_back(vector<float>{2, 2, 2});
Gnuplot gp;
gp << "set title 'test'\n";
gp << "splot" << gp.file1d(data) << "u 1:2:3 with points pt 5 title 'test'" << std::endl;
return 0;
}
Output: