# Animated 3D chart

This blogpost explains how to build a 3d surface area with matplotlib. It also shows how to vary the camera angle to produce an animation using Image Magick.

## 📍 Basic 3d density chart

Let's start by making a basic 3d density chart. This step is described in its own blogpost here, so let's just remember how the code looks like:

# library
from mpl_toolkits.mplot3d import Axes3D
import matplotlib.pyplot as plt
import pandas as pd
import seaborn as sns

# Get the data (csv file is hosted on the web)
url = 'https://raw.githubusercontent.com/holtzy/The-Python-Graph-Gallery/master/static/data/volcano.csv'

# Transform it to a long format
df=data.unstack().reset_index()
df.columns=["X","Y","Z"]

# And transform the old column name in something numeric
df['X']=pd.Categorical(df['X'])
df['X']=df['X'].cat.codes

# Make the plot
fig = plt.figure()
ax = fig.gca(projection='3d')
ax.plot_trisurf(df['Y'], df['X'], df['Z'], cmap=plt.cm.viridis, linewidth=0.2)

# Set the angle of the camera
ax.view_init(30,70)

## 🔄 Rotate the camera

The last line of the code chunck above is of high interest here. It set the angle the camera uses to display the figure (70° here).

To produce an animation, we're gonna produce several figure with varying angles, and output them at .png format. This is done thanks to a for loop:

# library
from mpl_toolkits.mplot3d import Axes3D
import matplotlib.pyplot as plt
import pandas as pd
import seaborn as sns

# Get the data (csv file is hosted on the web)
url = 'https://raw.githubusercontent.com/holtzy/The-Python-Graph-Gallery/master/static/data/volcano.csv'

# Transform it to a long format
df=data.unstack().reset_index()
df.columns=["X","Y","Z"]

# And transform the old column name in something numeric
df['X']=pd.Categorical(df['X'])
df['X']=df['X'].cat.codes

# We are going to do 20 plots, for 20 different angles
for angle in range(70,210,2):

# Turn interactive plotting off
plt.ioff()

# Make the plot
fig = plt.figure()
ax = fig.gca(projection='3d')
ax.plot_trisurf(df['Y'], df['X'], df['Z'], cmap=plt.cm.viridis, linewidth=0.2)

# Set the angle of the camera
ax.view_init(30,angle)

# Save it
filename='/Users/yan.holtz/Desktop/Volcano_step'+str(angle)+'.png'
plt.savefig(fname=filename, dpi=96)
plt.gca()
plt.close(fig)

Now, you should have a set of 12 images in the specified folder (/Users/yan.holtz/Desktop/ for me). Image magick is a command line tool that allows to concatenate those images in a gif file.

## 🎦 Animation

Install ImageMagick with this line of bash: brew install imagemagick

If you don't have brew installed, visit the image magick homepage for explanations.

Once the tool is installed, you can concatenate the 12 images using the following command:

# Bash
# convert -delay 80 Volcano_step*.png animated_volcano.gif

Note: the above line of code is written in bash, not in python. You have to execute it in a terminal, not in your python environment.

And here is the final result

Colors

Interactivity

Animation

Cheat sheets

Caveats

3D

## Contact & Edit

👋 This document is a work by Yan Holtz. Any feedback is highly encouraged. You can fill an issue on Github, drop me a message onTwitter, or send an email pasting yan.holtz.data with gmail.com.

This page is just a jupyter notebook, you can edit it here. Please help me making this website better 🙏!

Violin

Density

Histogram

Boxplot

Ridgeline

Scatterplot

Heatmap

Correlogram

Bubble

Connected Scatter

2D Density

Barplot

Wordcloud

Parallel

Lollipop

Circular Barplot

Treemap

Venn Diagram

Donut

Pie Chart

Dendrogram

Circular Packing

Line chart

Area chart

Stacked Area

Streamgraph

Timeseries

Map

Choropleth

Hexbin

Cartogram

Connection

Bubble

Chord Diagram

Network

Sankey

Arc Diagram

Edge Bundling

Colors

Interactivity

Animation

Cheat sheets

Caveats

3D