一：主要的知识点
1、说明
本文只是教程内容的一小段，因博客字数限制，故进行拆分。主教程链接：vtk教程——逐行解析官网所有Python示例-CSDN博客
2、知识点纪要
本段代码主要涉及的有①vtkStructuredGridGeometryFilter网格到几何的过滤器
二：代码及注释
from vtkmodules.vtkIOParallel import vtkMultiBlockPLOT3DReader from vtkmodules.vtkCommonColor import vtkNamedColors from vtkmodules.vtkFiltersGeometry import vtkStructuredGridGeometryFilter from vtkmodules.vtkCommonCore import vtkLookupTable from vtkmodules.vtkRenderingCore import vtkPolyDataMapper, vtkActor, vtkRenderer, vtkRenderWindow, vtkRenderWindowInteractor from vtkmodules.vtkFiltersCore import vtkStructuredGridOutlineFilter def main(): xyzFn, qFn = "Data/combxyz.bin", "Data/combq.bin" colors = vtkNamedColors() pl3d = vtkMultiBlockPLOT3DReader() pl3d.SetXYZFileName(xyzFn) pl3d.SetQFileName(qFn) pl3d.SetScalarFunctionNumber(100) # 使用编号为 100 的数据数组（例如，可能是压力或温度）为提取的平面上色 pl3d.SetVectorFunctionNumber(202) #使用编号为 202 的数据数组（通常是 U, V, $ 速度分量）作为矢量场数据 pl3d.Update() pl3dOutput = pl3d.GetOutput().GetBlock(0) """ vtkStructuredGridGeometryFilter VTK 里一个网格到几何（geometry）转换的过滤器 用于把 vtkStructuredGrid（结构化网格）提取成可以渲染的表面几何数据（vtkPolyData） 它允许你从三维结构化数据中 抽取一个“层面”（比如 i=0 面、j=5 面等）， 以便：显示网格表面；可视化内部结构；做切片渲染或剖面可视化 """ plane = vtkStructuredGridGeometryFilter() plane.SetInputData(pl3dOutput) plane.SetExtent(1, 100, 1, 100, 7, 7) lut = vtkLookupTable() lut.SetNumberOfColors(256) lut.SetHueRange(0.0, 0.667) planeMapper = vtkPolyDataMapper() planeMapper.SetLookupTable(lut) plane.SetInputData(pl3dOutput) planeMapper.SetScalarRange(pl3dOutput.GetScalarRange()) planeActor = vtkActor() planeActor.SetMapper(planeMapper) """ vtkStructuredGridOutlineFilter 为一个 vtkStructuredGrid 数据集生成“外框线（outline）”几何模型，用于显示该网格的边界范围 输入：vtkStructuredGrid， 输出：vtkPolyData """ outline = vtkStructuredGridOutlineFilter() outline.SetInputData(pl3dOutput) outlineMapper = vtkPolyDataMapper() outlineMapper.SetInputConnection(outline.GetOutputPort()) outlineActor = vtkActor() outlineActor.SetMapper(outlineMapper) ren1 = vtkRenderer() renWin = vtkRenderWindow() renWin.AddRenderer(ren1) iren = vtkRenderWindowInteractor() iren.SetRenderWindow(renWin) # Add the actors to the renderer, set the background and size. # ren1.AddActor(outlineActor) ren1.AddActor(planeActor) ren1.SetBackground(colors.GetColor3d('SlateGray')) ren1.TwoSidedLightingOff() renWin.SetSize(512, 512) renWin.SetWindowName('Rainbow') iren.Initialize() cam1 = ren1.GetActiveCamera() cam1.SetClippingRange(3.95297, 50) cam1.SetFocalPoint(8.88908, 0.595038, 29.3342) cam1.SetPosition(-12.3332, 31.7479, 41.2387) cam1.SetViewUp(0.060772, -0.319905, 0.945498) iren.Start() if __name__ == '__main__': main()
