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①vtk中几种txt的对比，②vtkBillboardTextActor3D的简介
二：代码及注释
#!/usr/bin/env python3 # noinspection PyUnresolvedReferences import vtkmodules.vtkInteractionStyle # noinspection PyUnresolvedReferences import vtkmodules.vtkRenderingFreeType # noinspection PyUnresolvedReferences import vtkmodules.vtkRenderingOpenGL2 from vtkmodules.vtkCommonColor import vtkNamedColors # noinspection PyUnresolvedReferences from vtkmodules.vtkCommonCore import vtkCommand from vtkmodules.vtkCommonCore import ( vtkMinimalStandardRandomSequence ) from vtkmodules.vtkFiltersSources import vtkSphereSource from vtkmodules.vtkRenderingCore import ( vtkActor, vtkBillboardTextActor3D, vtkPolyDataMapper, vtkRenderWindow, vtkRenderWindowInteractor, vtkRenderer ) def main(): colors = vtkNamedColors() rng = vtkMinimalStandardRandomSequence() rng.SetSeed(5127) renderer = vtkRenderer() renderer.SetBackground(colors.GetColor3d('DarkSlateGray')) render_window = vtkRenderWindow() render_window.AddRenderer(renderer) render_window.SetWindowName('BillboardTextActor3D') iren = vtkRenderWindowInteractor() iren.SetRenderWindow(render_window) sphere_source = vtkSphereSource() sphere_source.SetCenter(0.0, 0.0, 0.0) sphere_source.SetRadius(1.0) min_r = -10.0 max_r = 10.0 for i in range(0, 10): if i == 0: mapper = vtkPolyDataMapper() mapper.SetInputConnection(sphere_source.GetOutputPort()) actor = vtkActor() actor.SetMapper(mapper) actor.SetPosition(0, 0, 0) actor.GetProperty().SetColor(colors.GetColor3d('Peacock')) renderer.AddActor(actor) mapper = vtkPolyDataMapper() mapper.SetInputConnection(sphere_source.GetOutputPort()) actor = vtkActor() actor.SetMapper(mapper) actor.SetPosition(0, 0, 0) actor.GetProperty().SetColor(colors.GetColor3d('MistyRose')) """ vtkBillboardTextActor3D 是一种 3D 文字显示类，能够在三维空间中的任意坐标位置显示文字，并自动面向相机 """ text_actor = vtkBillboardTextActor3D() text_actor.SetPosition(actor.GetPosition()) text_actor.GetTextProperty().SetFontSize(12) text_actor.GetTextProperty().SetColor(colors.GetColor3d('Gold')) text_actor.GetTextProperty().SetJustificationToCentered() """ 几种text的比对 类名 | 类型 | 位置坐标系 | 是否随相机旋转 | 是否受光照影响 | 常见用途 vtkTextActor | 2D 屏幕文字 | 屏幕坐标（Viewport） | 固定在屏幕上 | 否 | UI文字、标题、图例 vtkVectorText | 3D 几何体文字 | 世界坐标（World） | 会随相机旋转 | 是（真正的 3D 模型） | 立体文字、雕刻文字 vtkBillboardTextActor3D | 3D 文字贴图 | 世界坐标（World） | 自动面向相机 | 否 | 3D 场景标注、标签、说明 """ position = random_position(min_r, max_r, rng) actor.SetPosition(position) label = f'{position[0]:0.3g}, {position[1]:0.3g}, {position[2]:0.3g}' text_actor.SetPosition(position) text_actor.SetInput(label) renderer.AddActor(actor) renderer.AddActor(text_actor) render_window.Render() render_window.SetWindowName('BillboardTextActor3D') iren.Start() def random_position(min_r, max_r, rng): p = list() for i in range(0, 3): p.append(rng.GetRangeValue(min_r, max_r)) rng.Next() return p if __name__ == '__main__': main()
