Python Forum

Hi I'm having issues translating the cube in the graph. Any help will be appreciated. Here is the code:

from mpl_toolkits.mplot3d import Axes3D
import numpy as np
from matplotlib import cm
import matplotlib.pyplot as plt
from scipy.spatial import Delaunay
import tensorflow as tf

def plot_basic_object(points):
    """Plots a basic object, assuming its convex and not too complex"""
    tri = Delaunay(points).convex_hull
    fig = plt.figure(figsize=(8, 8))
    ax = fig.add_subplot(111, projection='3d')
    S = ax.plot_trisurf(points[:,0], points[:,1], points[:,2],
                        triangles=tri,
                        shade=True, cmap=cm.Blues,lw=0.5)
    ax.set_xlim3d(-5, 5)
    ax.set_ylim3d(-5, 5)
    ax.set_zlim3d(-5, 5)
    
def create_cube(bottom_lower=(0, 0, 0), side_length=5):
    """Creates a cube starting from the given bottom-lower point (lowest x, y, z values)"""
    bottom_lower = np.array(bottom_lower)
    points = np.vstack([
        bottom_lower,
        bottom_lower + [0, side_length, 0],
        bottom_lower + [side_length, side_length, 0],
        bottom_lower + [side_length, 0, 0],
        bottom_lower + [0, 0, side_length],
        bottom_lower + [0, side_length, side_length],
        bottom_lower + [side_length, side_length, side_length],
        bottom_lower + [side_length, 0, side_length],
        bottom_lower,
    ])
    return points


cube_1 = create_cube(side_length=2)
plot_basic_object(cube_1)

def translate(points, amount):
    return tf.add(points, amount)

points = tf.constant(cube_1, dtype=tf.float32)
# Update the values here to move the cube around.
translation_amount = tf.constant([3, -3, 0], dtype=tf.float32)

translate_op = translate(points, translation_amount)
with tf.compat.v1.Session() as session:
    translated_cube = session.run(translate_op)

plot_basic_object(translated_cube)
plt.show()

Not understand what is the reason to use tensorflow here. Translation in 3D space can be done easily by addition a vector, e.g. np.array([x, y, z]), to cube's vertices (2d numpy array).

# cube1 = ... 

amount = np.array([3, -3, 0])
translated_cube = amount + cube1
plot_basic_object(translated_cube)
plt.show()

Are you talking about animation?