This example visualizes heart patient statistics across countries using an interactive 3D scatter plot. It displays two traces: death cases in red and active cases in blue, plotted against country name and patient category. The visualization uses Plotly.js within an HTML page, loading data from a CSV file via D3.js’s `d3.csv` function. D3’s `unpack` helper extracts columns for the x, y, and z axes, while Plotly’s `newPlot` renders the scatter3d chart with custom marker styling and opacity.