3D Plots

Matplotlib is a Python library for creating charts and visualizations — and with its 3D toolkit it can draw surfaces and scatter points across three axes, not just two.

Learn 3D Plots in our free Matplotlib course — a beginner-friendly interactive lesson with worked examples, a practice exercise and a quick reference.

Part of the free Matplotlib course at LearnCodingFast — hands-on lessons with examples you run in your browser, plus practice exercises and a quick quiz.

In this lesson you'll create a 3D Axes, plot a colorful surface from a coordinate grid, and scatter points in space with x, y, and z labels.

A 3D plot lives on a special Axes. You ask for one by passing projection='3d' when you add the subplot. That single argument unlocks methods like scatter and plot in three dimensions.

What you'll see: a cube-shaped plot box with 30 dots floating inside it at random x, y, and z positions. Because it's a 3D Axes, you can rotate it with the mouse in an interactive window, and all three axes are clearly labeled X, Y, and Z.

A surface is a height ( z ) at every point on an x-y grid. np.meshgrid builds that grid for you, and ax.plot_surface drapes a colored sheet over it.

What you'll see: a smooth, rippling surface that looks like waves spreading out from the center — the classic "sombrero" shape of sin(sqrt(x² + y²)) . The viridis colormap shades high peaks yellow and low troughs purple.

The same ax.plot you know from 2D works in 3D too — just pass a third list of z values. A parametric curve like a helix is a perfect example.

What you'll see: a spring-like spiral coiling upward. As t grows, x and y trace a circle while z keeps rising, so the line winds around and climbs — exactly like a stretched-out helix.

Replace each ___ to create a 3D Axes and scatter points.

❌ AttributeError: 'Axes' object has no attribute 'set_zlabel'

You forgot projection='3d' . A plain 2D Axes has no z-axis, so 3D methods don't exist on it.

X, Y, and Z must all be 2D and the same shape. Build X and Y with np.meshgrid , then compute Z from them.

Build a bowl-shaped surface from z = x² + y² and label all three axes.

Lesson 18 complete — your charts now have depth!

You created 3D Axes, scattered points in space, drew surfaces from a meshgrid, plotted a helix, and labeled all three axes.

🚀 Up next: Customizing with rcParams — set global style defaults for every chart.

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