Mayavi：如何翻转场景的 Z 轴？

Question

我正在尝试在 mayavi 体积 3D 图中翻转 Z 轴。我想出了如何旋转相机等，但这不是我想要的。我只想翻转Z轴的方向。无需操作数据本身

#Minimum working example

import numpy as np
from mayavi import mlab

x, y, z = np.ogrid[-5:5:64j, -5:5:64j, -5:5:64j] #Generate XYZ
data = np.arange(x.shape[0])
x = x.ravel()
y = y.ravel()
z = z.ravel()
mlab.points3d(x, y, z, data) #Produce volumetric plot
mlab.axes(xlabel='X', ylabel='Y', zlabel='Z') #Display axis
mlab.orientation_axes()
mlab.show()

Answer 1

您能否通过此示例解释一下使用非对称数据的含义。 您是否希望负 z 位于顶部？ 以及为什么旋转相机不会产生您想看到的结果？

您可以从宏编辑器中添加代码（如下所述）。

import numpy as np
from mayavi import mlab

x, y, z = np.ogrid[-5:5:64j, -5:5:64j, -5:5:64j] #Generate XYZ
data = np.arange(x.shape[0])
x = x.ravel()
y = y.ravel()
z = z.ravel()

# Recorded script from Mayavi2
from numpy import array
try:
    engine = mayavi.engine
except (AttributeError, NameError):
    from mayavi.api import Engine
    engine = Engine()
    engine.start()
if len(engine.scenes) == 0:
    engine.new_scene()
# -------------------------------------------
scene = engine.scenes[0]
scene.scene.camera.position = [20.68813263960946, 20.334388554161922, 20.518300376103046]
scene.scene.camera.focal_point = [0.24373197555541992, 0.24373197555541992, 0.25]
scene.scene.camera.view_angle = 30.0
scene.scene.camera.view_up = [-0.41179533881878827, -0.4046701524210215, 0.81649658092772626]
scene.scene.camera.clipping_range = [15.729834995160559, 58.864284541884331]
scene.scene.camera.compute_view_plane_normal()
scene.scene.render()

mlab.points3d(x, y, z, data) #Produce volumetric plot
mlab.axes(xlabel='X', ylabel='Y', zlabel='Z') #Display axis
mlab.orientation_axes()

mlab.show()

如果您真的可以手动设置所需的视图，我会这样做。 要获得正确的坐标以传递给mlab.view()，请在旋转场景时从交互式绘图中读取它们：