mayavi 用一种颜色给所有形状上色，除了 "some" 个顶点

Question

为了指出我创建的形状对应关系，我想将 3d 网格着色为灰色，除了一些点（例如 1 点）为红色。这是我当前的代码，不幸的是，它把整个图形涂成蓝色，最后一点涂成红色。

还有我的代码

mlab.figure()
        part_color = np.full((self.f.shape[0]),0.98)
        part_color[point_idx] = 1
        part_plot = mlab.triangular_mesh(self.part.vx, self.part.vy, self.part.vz, self.part.triv,
                                         scalars=part_color[:, np.newaxis])

这是我的最佳目标（忽略其余数字，我只想在某些点周围有一个红球）

Answer 1

您必须为此修改查找 Table (LUT)。

我采用了 "LUT modification" example 并根据您的需要对其进行了调整（最高值为红色，其他均为灰色）：

# Create some data
import numpy as np

x, y = np.mgrid[-10:10:200j, -10:10:200j]
z = 100 * np.sin(x * y) / (x * y)

# Visualize it with mlab.surf
from mayavi import mlab
mlab.figure(bgcolor=(1, 1, 1))
surf = mlab.surf(z, colormap='cool')

# Retrieve the LUT of the surf object.
lut = surf.module_manager.scalar_lut_manager.lut.table.to_array()

# The lut is a 255x4 array, with the columns representing RGBA
# (red, green, blue, alpha) coded with integers going from 0 to 255.

# We modify the alpha channel to add a transparency gradient
lut[:] = 255/2 # all grey
# red
lut[-1,0] = 255
lut[-1,1] = 0
lut[-1,2] = 0

lut[:, -1] = 255 # 100% translucency

# and finally we put this LUT back in the surface object. We could have
# added any 255*4 array rather than modifying an existing LUT.
surf.module_manager.scalar_lut_manager.lut.table = lut

# We need to force update of the figure now that we have changed the LUT.
mlab.draw()
mlab.view(40, 85)

mayavi 用一种颜色给所有形状上色，除了 "some" 个顶点

mayavi color all the shape by one color except "some" vertices

mayavi

mayavi.mlab