CODEWITHSUNDEEP
pythonmatplotlibmatplotlib-animationmatplotlib-3d
xyz123
xyz123

Reputation: 3

3D line animation on top of a 3D surface

I am trying to create a 3D line animation, on top of a 3D surface plot in matplotlib.

I am able to plot the 3D surface, but there is no animation. And there is no error in the code. I am setting the X,Y and Z values of the 3D line upto the current frame.

import numpy as np
import matplotlib.pyplot as plt
from mpl_toolkits import mplot3d
from matplotlib import animation

def f(x,y):
    return x+y

fig = plt.figure()
ax = fig.add_subplot(111, projection='3d')
X = np.arange(0, 10, 1)
Y = np.arange(0, 10, 1)
Z = X+Y

X1, Y1 = np.meshgrid(X, Y)
Z1 = f(X1, Y1)
ax.plot_surface(X1, Y1, Z1, color='b', alpha=0.5)
plt.show()

line, = ax.plot([], [], [], lw=2)
def init():
    line.set_data([], [])
    line.set_3d_properties([])
    return line
def animate(i, line, X, Y, Z):
    line.set_data(X[:i], Y[:i])
    line.set_3d_properties(Z[:i])
    return line
anim = animation.FuncAnimation(fig, animate, init_func=init, fargs=(line, X, Y, Z),
                           frames=10, interval=200,
                           repeat_delay=5, blit=True)
plt.show()

Upvotes: 0

Views: 2894

Answers (1)

ImportanceOfBeingErnest
ImportanceOfBeingErnest

Reputation: 339052

  1. You don't get any error, because you call plt.show() before any animation is even defined. Remove the first plt.show().

  2. You will then get errors as expected. The problem is that you need to return a list of artists from the animating functions when using blit=True. This is easily achieved by adding a comma, 

     return line,

Complete code:

import numpy as np
import matplotlib.pyplot as plt
from mpl_toolkits import mplot3d
from matplotlib import animation

def f(x,y):
    return x+y

fig = plt.figure()
ax = fig.add_subplot(111, projection='3d')
X = np.arange(0, 10, 1)
Y = np.arange(0, 10, 1)
Z = X+Y

X1, Y1 = np.meshgrid(X, Y)
Z1 = f(X1, Y1)
ax.plot_surface(X1, Y1, Z1, color='red', alpha=0.5)

line, = ax.plot([], [], [], lw=2)

def init():
    line.set_data([], [])
    line.set_3d_properties([])
    return line,

def animate(i, line, X, Y, Z):
    line.set_data(X[:i], Y[:i])
    line.set_3d_properties(Z[:i])
    return line,

anim = animation.FuncAnimation(fig, animate, init_func=init, fargs=(line, X, Y, Z),
                           frames=10, interval=200,
                           repeat_delay=5, blit=True)
plt.show()

Upvotes: 1

Related Questions