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①vtkWarpVector 根据向量场对几何体进行形变
二：代码及注释
import vtkmodules.vtkInteractionStyle import vtkmodules.vtkRenderingOpenGL2 from vtkmodules.vtkCommonColor import vtkNamedColors from vtkmodules.vtkIOLegacy import vtkPolyDataReader from vtkmodules.vtkFiltersGeneral import vtkWarpVector from vtkmodules.vtkFiltersCore import vtkPolyDataNormals, vtkVectorDot from vtkmodules.vtkCommonCore import vtkLookupTable from vtkmodules.vtkRenderingCore import vtkColorTransferFunction, vtkActor, vtkDataSetMapper, vtkRenderer, \ vtkRenderWindow, vtkRenderWindowInteractor def main(): colors = vtkNamedColors() file_name, color_scheme = "Data/plate.vtk", 0 plate = vtkPolyDataReader() plate.SetFileName(file_name) plate.SetVectorsName("mode8") # 指定从输入的 .vtk 文件中读取哪个数据数组作为主要的矢量数据 plate.Update() """ vtkWarpVector 根据向量场对几何体进行形变 """ warp = vtkWarpVector() warp.SetInputConnection(plate.GetOutputPort()) warp.SetScaleFactor(0.5) normals = vtkPolyDataNormals() normals.SetInputConnection(warp.GetOutputPort()) """ vtkVectorDot 主要用于计算两个向量场之间的点积,并把结果作为一个新的标量场输出 """ color = vtkVectorDot() # 在这里只有一个输入，因此计算的是法向矢量与活动矢量之间的点积 color.SetInputConnection(normals.GetOutputPort()) lut = vtkLookupTable() MakeLUT(color_scheme, lut) plateMapper = vtkDataSetMapper() plateMapper.SetInputConnection(color.GetOutputPort()) plateMapper.SetLookupTable(lut) plateMapper.SetScalarRange(-1, 1) plateActor = vtkActor() plateActor.SetMapper(plateMapper) ren = vtkRenderer() renWin = vtkRenderWindow() renWin.AddRenderer(ren) iren = vtkRenderWindowInteractor() iren.SetRenderWindow(renWin) ren.AddActor(plateActor) ren.SetBackground(colors.GetColor3d("Wheat")) renWin.SetSize(512, 512) renWin.SetWindowName('DisplacementPlot') ren.GetActiveCamera().SetPosition(13.3991, 14.0764, 9.97787) ren.GetActiveCamera().SetFocalPoint(1.50437, 0.481517, 4.52992) ren.GetActiveCamera().SetViewAngle(30) ren.GetActiveCamera().SetViewUp(- 0.120861, 0.458556, - 0.880408) ren.GetActiveCamera().SetClippingRange(12.5724, 26.8374) renWin.Render() iren.Start() def MakeLUT(colorScheme, lut): nc = 256 ctf = vtkColorTransferFunction() if colorScheme == 1: ctf.SetColorSpaceToDiverging() ctf.AddRGBPoint(0.0, 0.085, 0.532, 0.201) ctf.AddRGBPoint(0.5, 0.865, 0.865, 0.865) ctf.AddRGBPoint(1.0, 0.436, 0.308, 0.631) lut.SetNumberOfTableValues(nc) lut.Build() for i in range(0, nc): rgb = list(ctf.GetColor(float(i) / nc)) rgb.append(1) lut.SetTableValue(i, *rgb) elif colorScheme == 2: nc2 = nc / 2.0 lut.SetNumberOfColors(nc) lut.Build() for i in range(0, int(nc2)): # White to black. v = (nc2 - i) / nc2 lut.SetTableValue(i, v, v, v, 1) for i in range(int(nc2), nc): # Black to white. v = (i - nc2) / nc2 lut.SetTableValue(i, v, v, v, 1) else: ctf.SetColorSpaceToDiverging() ctf.AddRGBPoint(0.0, 0.230, 0.299, 0.754) ctf.AddRGBPoint(1.0, 0.706, 0.016, 0.150) lut.SetNumberOfTableValues(nc) lut.Build() for i in range(0, nc): rgb = list(ctf.GetColor(float(i) / nc)) rgb.append(1.0) lut.SetTableValue(i, *rgb) if __name__ == '__main__': main()
