Voxel Cylinder

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
r = 5

# Cylinder shape
cylinder = ((x - cx)**2 + (y - cy)**2 <= r**2)

# Gradient from coral #F5276C to pink #F527B0
colors = np.empty(cylinder.shape + (4,), dtype=np.float32)
colors[..., 3] = 0

norm_z = z / (n - 1)
colors[cylinder, 0] = 0.96  # F5 (constant)
colors[cylinder, 1] = 0.15  # 27 (constant)
colors[cylinder, 2] = 0.42 + 0.27 * norm_z[cylinder]  # 6C to B0
colors[cylinder, 3] = 0.85

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

ax.voxels(cylinder, 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('Voxel Cylinder', 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()