Stacked Rings Voxels

import matplotlib.pyplot as plt
import numpy as np

n = 20
np.random.seed(42)

# Simple noise-like terrain
x, y = np.meshgrid(np.linspace(0, 4, n), np.linspace(0, 4, n))
heights = (3 * np.sin(x) * np.cos(y) + 
           2 * np.sin(2*x) * np.cos(2*y) + 
           np.random.randn(n, n) * 0.5 + 5).astype(int)
heights = np.clip(heights, 0, 9)

voxels = np.zeros((n, n, 10), dtype=bool)
for i in range(n):
    for j in range(n):
        voxels[i, j, :heights[i, j]] = True

# Gradient from blue #276CF5 to purple #4927F5
z_idx = np.indices((n, n, 10))[2]
colors = np.empty(voxels.shape + (4,), dtype=np.float32)
colors[..., 3] = 0

norm_z = z_idx / 9
# 276CF5 -> 4927F5
colors[voxels, 0] = 0.15 + 0.14 * norm_z[voxels]  # 27 to 49
colors[voxels, 1] = 0.42 - 0.27 * norm_z[voxels]  # 6C to 27
colors[voxels, 2] = 0.96  # F5 (constant)
colors[voxels, 3] = 0.9

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=0.15)

ax.set_xlabel('X', fontsize=11, color='#94a3b8', labelpad=10)
ax.set_ylabel('Y', fontsize=11, color='#94a3b8', labelpad=10)
ax.set_zlabel('Height', fontsize=11, color='#94a3b8', labelpad=10)
ax.set_title('Voxel Noise Terrain', 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()