Spiral Column Voxels

import matplotlib.pyplot as plt
import numpy as np

n = 15
x, y, z = np.indices((n, n, n))
cx, cy = n // 2, n // 2

# Create stacked rings of different radii
voxels = np.zeros((n, n, n), dtype=bool)
for zz in range(0, n, 3):
    r = 4 + (zz // 3) % 3
    ring = (np.abs((x[:,:,zz] - cx)**2 + (y[:,:,zz] - cy)**2 - r**2) <= r)
    voxels[:, :, zz] = ring

# Gradient from yellow #F5D327 to amber #F5B027
z_idx = np.indices((n, n, n))[2]
colors = np.empty(voxels.shape + (4,), dtype=np.float32)
colors[..., 3] = 0

norm_z = z_idx / (n - 1)
# F5D327 -> F5B027
colors[voxels, 0] = 0.96  # F5 (constant)
colors[voxels, 1] = 0.83 - 0.14 * norm_z[voxels]  # D3 to B0
colors[voxels, 2] = 0.15  # 27 (constant)
colors[voxels, 3] = 0.88

fig = plt.figure(figsize=(10, 8), facecolor='#020B14')
ax = fig.add_subplot(111, projection='3d', facecolor='#020B14')

ax.voxels(voxels, facecolors=colors, edgecolors='#1e293b', linewidth=0.2)

ax.set_xlabel('X', fontsize=11, color='#94a3b8', labelpad=10)
ax.set_ylabel('Y', fontsize=11, color='#94a3b8', labelpad=10)
ax.set_zlabel('Z', fontsize=11, color='#94a3b8', labelpad=10)
ax.set_title('Layered Rings Voxels', fontsize=14, color='white', fontweight='bold', pad=20)

ax.tick_params(colors='#64748b', labelsize=8)
ax.xaxis.pane.fill = False
ax.yaxis.pane.fill = False
ax.zaxis.pane.fill = False
ax.xaxis.pane.set_edgecolor('#1e293b')
ax.yaxis.pane.set_edgecolor('#1e293b')
ax.zaxis.pane.set_edgecolor('#1e293b')
ax.grid(True, alpha=0.2, color='#475569')

plt.tight_layout()
plt.show()