vtk 3D坐标标尺应用 3D 刻度尺

简介：

3D 刻度尺，也是常用功能，功能强大 3D 刻度尺 CubeAxesActor

vtkCubeAxes调整坐标轴的刻度、原点和显示效果，包括关闭小标尺、固定坐标轴原点，以及设置FlyMode模式。同时，展示了通过vtkOutlineFilter创建立体包围盒的方法，提供了一种只显示XYZ坐标轴和包围盒的解决方案。最后提到了vtkCamera的用法作为后续探讨的话题；

Part2:简单实现：

#!/usr/bin/env python

# noinspection PyUnresolvedReferences
import vtkmodules.vtkInteractionStyle
# noinspection PyUnresolvedReferences
import vtkmodules.vtkRenderingOpenGL2
from vtkmodules.vtkCommonColor import vtkNamedColors
from vtkmodules.vtkFiltersSources import vtkSuperquadricSource
from vtkmodules.vtkRenderingAnnotation import vtkCubeAxesActor
from vtkmodules.vtkRenderingCore import (
    vtkActor,
    vtkPolyDataMapper,
    vtkRenderWindow,
    vtkRenderWindowInteractor,
    vtkRenderer
)


def main():
    colors = vtkNamedColors()

    backgroundColor = colors.GetColor3d("DarkSlateGray")
    actorColor = colors.GetColor3d("Tomato")
    axis1Color = colors.GetColor3d("Salmon")
    axis2Color = colors.GetColor3d("PaleGreen")
    axis3Color = colors.GetColor3d("LightSkyBlue")

    # Create a superquadric
    superquadricSource = vtkSuperquadricSource()
    superquadricSource.SetPhiRoundness(3.1)
    superquadricSource.SetThetaRoundness(1.0)
    superquadricSource.Update()  # needed to GetBounds later

    renderer = vtkRenderer()

    mapper = vtkPolyDataMapper()
    mapper.SetInputConnection(superquadricSource.GetOutputPort())

    superquadricActor = vtkActor()
    superquadricActor.SetMapper(mapper)
    superquadricActor.GetProperty().SetDiffuseColor(actorColor)
    superquadricActor.GetProperty().SetDiffuse(.7)
    superquadricActor.GetProperty().SetSpecular(.7)
    superquadricActor.GetProperty().SetSpecularPower(50.0)

    cubeAxesActor = vtkCubeAxesActor()
    cubeAxesActor.SetUseTextActor3D(1)
    cubeAxesActor.SetBounds(superquadricSource.GetOutput().GetBounds())
    cubeAxesActor.SetCamera(renderer.GetActiveCamera())
    cubeAxesActor.GetTitleTextProperty(0).SetColor(axis1Color)
    cubeAxesActor.GetTitleTextProperty(0).SetFontSize(48)
    cubeAxesActor.GetLabelTextProperty(0).SetColor(axis1Color)

    cubeAxesActor.GetTitleTextProperty(1).SetColor(axis2Color)
    cubeAxesActor.GetLabelTextProperty(1).SetColor(axis2Color)

    cubeAxesActor.GetTitleTextProperty(2).SetColor(axis3Color)
    cubeAxesActor.GetLabelTextProperty(2).SetColor(axis3Color)

    cubeAxesActor.DrawXGridlinesOn()
    cubeAxesActor.DrawYGridlinesOn()
    cubeAxesActor.DrawZGridlinesOn()
    cubeAxesActor.SetGridLineLocation(cubeAxesActor.VTK_GRID_LINES_FURTHEST)

    cubeAxesActor.XAxisMinorTickVisibilityOff()
    cubeAxesActor.YAxisMinorTickVisibilityOff()
    cubeAxesActor.ZAxisMinorTickVisibilityOff()

    cubeAxesActor.SetFlyModeToStaticEdges()
    renderer.AddActor(cubeAxesActor)
    renderer.AddActor(superquadricActor)
    renderer.GetActiveCamera().Azimuth(30)
    renderer.GetActiveCamera().Elevation(30)

    renderer.ResetCamera()
    renderer.SetBackground(backgroundColor)

    renderWindow = vtkRenderWindow()

    renderWindow.AddRenderer(renderer)
    renderWindow.SetSize(640, 480)
    renderWindow.SetWindowName('CubeAxesActor')

    renderWindowInteractor = vtkRenderWindowInteractor()
    renderWindowInteractor.SetRenderWindow(renderWindow)

    renderWindow.Render()
    renderer.GetActiveCamera().Zoom(0.8)
    renderWindowInteractor.Start()


if __name__ == '__main__':
    main()

Part3: 三维图表上相应的坐标，在VTK中提供了相应的类vtkCubeAxes和vtkCubeAxes2D

vtkCubeAxesActor2D在数据集的边界框上绘制轴，并用x-y-z坐标标记轴。

Part4 实现：

cpp 复制代码

import vtk

colors = vtk.vtkNamedColors()

icosahedron = vtk.vtkPlatonicSolidSource()
icosahedron.SetSolidTypeToIcosahedron()

normals = vtk.vtkPolyDataNormals()
normals.SetInputConnection(icosahedron.GetOutputPort())

icosahedron_mapper = vtk.vtkPolyDataMapper()
icosahedron_mapper.SetInputConnection(normals.GetOutputPort())
icosahedron_mapper.ScalarVisibilityOff()

icosahedron_actor = vtk.vtkLODActor()
icosahedron_actor.SetMapper(icosahedron_mapper)
icosahedron_actor.GetProperty().SetColor(colors.GetColor3d("Plum"))

outline = vtk.vtkOutlineFilter()
outline.SetInputConnection(normals.GetOutputPort())

map_outline = vtk.vtkPolyDataMapper()
map_outline.SetInputConnection(outline.GetOutputPort())

outline_actor = vtk.vtkActor()
outline_actor.SetMapper(map_outline)
outline_actor.GetProperty().SetColor(colors.GetColor3d("SeaGreen"))
outline_actor.GetProperty().SetLineWidth(2)

ren1 = vtk.vtkRenderer()
ren1.SetViewport(0, 0, 0.5, 1.0)

ren2 = vtk.vtkRenderer()
ren2.SetViewport(0.5, 0, 1.0, 1.0)
ren2.SetActiveCamera(ren1.GetActiveCamera())

renWin = vtk.vtkRenderWindow()
renWin.AddRenderer(ren1)
renWin.AddRenderer(ren2)
renWin.SetWindowName("CubeAxesActor2D")
renWin.SetSize(1200, 600)

iren = vtk.vtkRenderWindowInteractor()
iren.SetRenderWindow(renWin)
style = vtk.vtkInteractorStyleTrackballCamera()
iren.SetInteractorStyle(style)

ren1.AddViewProp(icosahedron_actor)
ren1.AddViewProp(outline_actor)
ren2.AddViewProp(icosahedron_actor)
ren2.AddViewProp(outline_actor)

ren1.SetBackground(colors.GetColor3d("MidnightBlue"))
ren2.SetBackground(colors.GetColor3d("MidnightBlue"))

tprop = vtk.vtkTextProperty()
tprop.SetColor(colors.GetColor3d("Yellow"))
tprop.ShadowOn()
tprop.SetFontSize(20)

axes1 = vtk.vtkCubeAxesActor2D()
axes1.SetInputConnection(normals.GetOutputPort())
axes1.SetCamera(ren1.GetActiveCamera())
axes1.SetLabelFormat("%6.4g")
axes1.SetFlyModeToOuterEdges()
axes1.SetAxisTitleTextProperty(tprop)
axes1.SetAxisLabelTextProperty(tprop)
axes1.GetProperty().SetLineWidth(2)
ren1.AddViewProp(axes1)

axes2 = vtk.vtkCubeAxesActor2D()
axes2.SetViewProp(icosahedron_actor)
axes2.SetCamera(ren2.GetActiveCamera())
axes2.SetLabelFormat("%6.4g")
axes2.SetFlyModeToClosestTriad()
axes2.ScalingOff()
axes2.SetAxisTitleTextProperty(tprop)
axes2.SetAxisLabelTextProperty(tprop)
axes2.GetProperty().SetLineWidth(2)
ren2.AddViewProp(axes2)

ren1.ResetCamera()
iren.Initialize()
renWin.Render()
iren.Start()