如何在vtk.js中为模型着色

import vtkActor from 'vtk.js/Sources/Rendering/Core/Actor';
import vtkMapper from 'vtk.js/Sources/Rendering/Core/Mapper';
import vtkRenderWindow from 'vtk.js/Sources/Rendering/Core/RenderWindow';
import vtkRenderer from 'vtk.js/Sources/Rendering/Core/Renderer';
import vtkSTLReader from 'vtk.js/Sources/IO/Geometry/STLReader';

const renderWindow = vtkRenderWindow.newInstance();
const renderer = vtkRenderer.newInstance();
renderWindow.addRenderer(renderer);

const actor = vtkActor.newInstance();
const mapper = vtkMapper.newInstance();
actor.setMapper(mapper);
renderer.addActor(actor);

const reader = vtkSTLReader.newInstance();
reader.setUrl('path/to/model.stl').then(() => {
  reader.update();
  mapper.setInputConnection(reader.getOutputPort());
  renderWindow.render();
});

const color = [1, 0, 0]; // 设置为红色，RGB值范围为0-1
actor.getProperty().setColor(...color);

renderer.resetCamera();
renderWindow.render();