创建一个vtkStructuredGrid文件，VTK用Glyph可视化流场_vtk structuredgrid

写两个程序创建数据集

1. 六个特征点，
2. 尺寸大小（长宽比、面积大小）
3. 随机干扰，干扰强度

Glyph Arrow

以箭头方式可视化流场
创建了一个三维[4,4,4]的sgrid.vtk的网格文件，和一个polydata类型的sgridExtend.vtk文件

"""
===============================
  -*- coding:utf-8 -*-
  Author    :hanjinyue
  Time      :2021/4/2 12:06
  File      :HelloVTK\SgridExtend.py
================================
"""

import vtk

#data
p = vtk.vtkPoints()#点集
#创建向量数组
vectors = vtk.vtkFloatArray()#向量数组
vector = [0.0,0.0,0.0]
vectors.SetNumberOfComponents(3)
sum = 0
for i in range(4):
    for j in range(4):
        for k in range(4):
            p.InsertPoint(sum,k+5.0,j+5.0,i+5.0)
            vector[0] = 0.5*k+0.1
            vector[1] = 0.2*j+0.2
            vector[2] = 0.3*i + 0.3
            vectors.InsertNextTuple(vector)
            sum = sum +1



weights = vtk.vtkDoubleArray()
weights.SetNumberOfValues(sum)
for i in range(sum):
    weights.SetValue(i,i+0.5)#第i个点的属性为i+0.5

#结构化网格数据
sgrid = vtk.vtkStructuredGrid
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