将matplotlib版本从1.3.1更新到2.0.2后,当我想使用plot_trisurf通过3d点生成TIN时,我得到了难以理解的结果。我的测试代码如下:
import sys
import matplotlib
import matplotlib.pyplot as plt
from matplotlib.ticker import MaxNLocator
from matplotlib import cm
from mpl_toolkits.mplot3d import Axes3D
import numpy
from numpy.random import randn
from scipy import array, newaxis
chunk = numpy.loadtxt('test.xyz') #test.xyz contains 38010 points,
DATA=numpy.array(chunk)
Xs = DATA[:,0]
Ys = DATA[:,1]
Zs = DATA[:,2]
fig = plt.figure()
ax = fig.add_subplot(111, projection='3d')
surf = ax.plot_trisurf(Xs, Ys, Zs, cmap=cm.jet, linewidth=0)
fig.colorbar(surf)
ax.xaxis.set_major_locator(MaxNLocator(5))
ax.yaxis.set_major_locator(MaxNLocator(6))
ax.zaxis.set_major_locator(MaxNLocator(5))
fig.tight_layout()
plt.show()
test.xyz 文件包含 38010 个点。部分内容如下,完整文件可以找到here.
512743.63 5403547.33 308.68
512743.62 5403547.33 308.70
512743.61 5403547.33 308.72
512743.60 5403547.34 308.68
512743.60 5403547.33 308.73
512741.50 5403547.36 309.05
512741.50 5403547.36 309.07
512741.49 5403547.46 309.09
512741.48 5403547.46 309.07
512741.47 5403547.46 309.10
512741.47 5403547.45 309.13
512741.46 5403547.37 309.04
512739.39 5403547.51 309.10
512739.39 5403547.48 309.34
512739.38 5403547.60 309.25
512739.37 5403547.71 309.15
512739.39 5403547.49 310.65
512739.39 5403547.48 310.70
512739.38 5403547.49 310.69
512739.37 5403547.48 310.72
512739.36 5403547.39 310.64
512739.32 5403547.41 309.20
512737.33 5403547.26 313.14
512737.33 5403547.37 313.09
512737.32 5403547.38 313.03
512737.30 5403547.37 313.12
512737.30 5403547.26 313.14
512735.22 5403547.41 311.72
512735.22 5403547.43 312.29
512735.22 5403547.49 312.59
512735.21 5403547.51 312.48
512735.20 5403547.60 312.53
512735.19 5403547.61 312.48
512735.18 5403547.72 312.40
512735.18 5403547.71 312.49
512735.17 5403547.71 312.51
512735.16 5403547.70 312.58
512735.15 5403547.61 312.52
after updating, the result is shown as:
I think it is wrong, because I provide enough points to generate a TIN, but the result seems to use only a small part of the point. Before updating the matplotlib, I can get a result like: