8000 I keep getting these Axes errors and I don't know why. "Cannot attribute 'add_collection3d' for class 'Axes' Attribute 'add_collection3d' is unknown" · Issue #29003 · matplotlib/matplotlib · GitHub
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I keep getting these Axes errors and I don't know why. "Cannot attribute 'add_collection3d' for class 'Axes' Attribute 'add_collection3d' is unknown" #29003

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MrCherub opened this issue Oct 21, 2024 · 2 comments
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I keep getting these Axes errors and I don't know why. "Cannot attribute 'add_collection3d' for class 'Axes' Attribute 'add_collection3d' is unknown" #29003

MrCherub opened this issue Oct 21, 2024 · 2 comments
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Community support Users in need of help. status: duplicate

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@MrCherub
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Bug summary

I don't know why it is that I am getting these errors. I'll post an image with the errors.

Screenshot 2024-10-21 at 12 13 24 AM

Code for reproduction

import numpy as np
import matplotlib.pyplot as plt
from mpl_toolkits.mplot3d.art3d import Poly3DCollection

# Define vertices of a 4D hypercube (tesseract)
def tesseract_vertices():
    vertices = np.array([[1 if i & (1 << j) else -1 for j in range(4)] for i in range(16)])
    return vertices

# Define edges of the tesseract
def tesseract_edges(vertices):
    edges = []
    for i in range(len(vertices)):
        for j in range(i + 1, len(vertices)):
            if np.sum(np.abs(vertices[i] - vertices[j])) == 2:
                edges.append((i, j))
    return edges

# Perspective projection from 4D to 3D
def perspective_projection(v, distance=2):
    w = v[3]
    factor = distance / (distance - w)
    return np.array(v[:3]) * factor

# Project all vertices of the tesseract into 3D
def project_tesseract(vertices):
    return np.array([perspective_projection(v) for v in vertices])

# Define faces based on the tesseract edges
def tesseract_faces(vertices, edges):
    faces = []
    # List of adjacent vertices that form square faces (hardcoded for simplicity)
    square_faces = [
        [0, 1, 3, 2], [4, 5, 7, 6], [0, 1, 5, 4], [2, 3, 7, 6],
        [0, 2, 6, 4], [1, 3, 7, 5], [8, 9, 11, 10], [12, 13, 15, 14],
        [8, 9, 13, 12], [10, 11, 15, 14], [8, 10, 14, 12], [9, 11, 15, 13],
        [0, 4, 12, 8], [1, 5, 13, 9], [2, 6, 14, 10], [3, 7, 15, 11]
    ]
    
    for face in square_faces:
        # Project face vertices into 3D
        projected_face = [perspective_projection(vertices[i]) for i in face]
        faces.append(projected_face)
    
    return faces

# Plot the 3D projection of the tesseract
def plot_tesseract_3d(vertices, edges, faces):
    fig = plt.figure()
    ax = fig.add_subplot(111, projection='3d')
    
    # Add edges
    for edge in edges:
        points = vertices[list(edge)]
        ax.plot(points[:, 0], points[:, 1], points[:, 2], 'b-', lw=1)

    # Add faces with transparency and colors
    for face in faces:
        poly3d = Poly3DCollection([face], alpha=0.5, edgecolor='k', facecolor='cyan')
        ax.add_collection3d(poly3d)

    # Add vertices with colors
    ax.scatter(vertices[:, 0], vertices[:, 1], vertices[:, 2], c='r', s=100)
    for i, vertex in enumerate(vertices):
        ax.text(vertex[0], vertex[1], vertex[2], f'{i}', color='black')

    ax.set_xlabel('X axis')
    ax.set_ylabel('Y axis')
    ax.set_zlabel('Z axis')
    plt.title('3D Perspective Projection of a Tesseract')
    plt.show()

def main():
    vertices_4d = tesseract_vertices()
    edges = tesseract_edges(vertices_4d)
    print("Edges: ", len(edges))  # This prints the number of edges
    vertices_3d = project_tesseract(vertices_4d)
    faces = tesseract_faces(vertices_4d, edges)
    plot_tesseract_3d(vertices_3d, edges, faces)

if __name__ == "__main__":
    main()

Actual outcome

Screenshot 2024-10-21 at 12 53 44 AM It seems to be working but I don't know why the errors appear.

Expected outcome

No errors to appear.

Additional information

No response

Operating system

macOS Sequoia 15.0.1

Matplotlib Version

3.9.2

Matplotlib Backend

macosx

Python version

Python 3.12.7

Jupyter version

No response

Installation

pip
@rcomer
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rcomer commented Oct 21, 2024 •
edited
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Hi @MrCherub, I believe these errors come from the type annotation checker and the reason it’s happening is explained at #27455. It is not a problem with your actual code.

@rcomer rcomer added the Community support Users in need of help. label Oct 21, 2024
@timhoffm
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See https://github.com/matplotlib/matplotlib/issues/27455#issuecomment-2425901612 on a workaround to placate the type checker.

@timhoffm timhoffm closed this as not planned Won't fix, can't repro, dup 5128 licate, stale Oct 21, 2024
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@timhoffm @rcomer @MrCherub
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