matplotlib-cpp with 3D scatter plot is a quick hack code to add following two functions to matplotlib-cpp, which is one of the simplest C++ plotting libraries.

Python-based utility for visualizing 3D data (with an additional color channel) using matplotlib. The voxel plotter allows for a customizable display of 3D data with controls for transparency ...

This post recommends using Trellis plots instead of 3D bar charts for three-dimensional ... Either a bar chart or a dot plot works well. It is often useful to condition on more than one variable.