matplotlib & pandas

Python/matplotlab/gallery/mplot3d/voxels_rgb.md

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+# 带有rgb颜色的3D体素/体积图
+
+演示使用ax.voxels可视化颜色空间的各个部分
+
+![带有rgb颜色的3D体素/体积图示例](https://matplotlib.org/_images/sphx_glr_voxels_rgb_001.png)
+
+```python
+import matplotlib.pyplot as plt
+import numpy as np
+
+# This import registers the 3D projection, but is otherwise unused.
+from mpl_toolkits.mplot3d import Axes3D  # noqa: F401 unused import
+
+
+def midpoints(x):
+    sl = ()
+    for i in range(x.ndim):
+        x = (x[sl + np.index_exp[:-1]] + x[sl + np.index_exp[1:]]) / 2.0
+        sl += np.index_exp[:]
+    return x
+
+# prepare some coordinates, and attach rgb values to each
+r, g, b = np.indices((17, 17, 17)) / 16.0
+rc = midpoints(r)
+gc = midpoints(g)
+bc = midpoints(b)
+
+# define a sphere about [0.5, 0.5, 0.5]
+sphere = (rc - 0.5)**2 + (gc - 0.5)**2 + (bc - 0.5)**2 < 0.5**2
+
+# combine the color components
+colors = np.zeros(sphere.shape + (3,))
+colors[..., 0] = rc
+colors[..., 1] = gc
+colors[..., 2] = bc
+
+# and plot everything
+fig = plt.figure()
+ax = fig.gca(projection='3d')
+ax.voxels(r, g, b, sphere,
+          facecolors=colors,
+          edgecolors=np.clip(2*colors - 0.5, 0, 1),  # brighter
+          linewidth=0.5)
+ax.set(xlabel='r', ylabel='g', zlabel='b')
+
+plt.show()
+```
+
+## 下载这个示例
+            
+- [下载python源码: voxels_rgb.py](https://matplotlib.org/_downloads/voxels_rgb.py)
+- [下载Jupyter notebook: voxels_rgb.ipynb](https://matplotlib.org/_downloads/voxels_rgb.ipynb)