vtk.js

VolumeContour

Live example

Source

import '@kitware/vtk.js/favicon';

// Load the rendering pieces we want to use (for both WebGL and WebGPU)
import '@kitware/vtk.js/Rendering/Profiles/Geometry';

// Force DataAccessHelper to have access to various data source
import '@kitware/vtk.js/IO/Core/DataAccessHelper/HtmlDataAccessHelper';
import '@kitware/vtk.js/IO/Core/DataAccessHelper/HttpDataAccessHelper';
import '@kitware/vtk.js/IO/Core/DataAccessHelper/JSZipDataAccessHelper';

import vtkActor from '@kitware/vtk.js/Rendering/Core/Actor';
import vtkFullScreenRenderWindow from '@kitware/vtk.js/Rendering/Misc/FullScreenRenderWindow';
import vtkHttpDataSetReader from '@kitware/vtk.js/IO/Core/HttpDataSetReader';
import vtkImageMarchingCubes from '@kitware/vtk.js/Filters/General/ImageMarchingCubes';
import vtkMapper from '@kitware/vtk.js/Rendering/Core/Mapper';

import controlPanel from './controller.html';

const fullScreenRenderWindow = vtkFullScreenRenderWindow.newInstance({
  background: [0, 0, 0],
});
const renderWindow = fullScreenRenderWindow.getRenderWindow();
const renderer = fullScreenRenderWindow.getRenderer();

fullScreenRenderWindow.addController(controlPanel);

const actor = vtkActor.newInstance();
const mapper = vtkMapper.newInstance();
const marchingCube = vtkImageMarchingCubes.newInstance({
  contourValue: 0.0,
  computeNormals: true,
  mergePoints: true,
});

actor.setMapper(mapper);
mapper.setInputConnection(marchingCube.getOutputPort());

function updateIsoValue(e) {
  const isoValue = Number(e.target.value);
  marchingCube.setContourValue(isoValue);
  renderWindow.render();
}

const reader = vtkHttpDataSetReader.newInstance({ fetchGzip: true });
marchingCube.setInputConnection(reader.getOutputPort());

reader
  .setUrl(`${__BASE_PATH__}/data/volume/headsq.vti`, { loadData: true })
  .then(() => {
    const data = reader.getOutputData();
    const dataRange = data.getPointData().getScalars().getRange();
    const firstIsoValue = (dataRange[0] + dataRange[1]) / 3;

    const el = document.querySelector('.isoValue');
    el.setAttribute('min', dataRange[0]);
    el.setAttribute('max', dataRange[1]);
    el.setAttribute('value', firstIsoValue);
    el.addEventListener('input', updateIsoValue);

    marchingCube.setContourValue(firstIsoValue);
    renderer.addActor(actor);
    renderer.getActiveCamera().set({ position: [1, 1, 0], viewUp: [0, 0, -1] });
    renderer.resetCamera();
    renderWindow.render();
  });

global.fullScreen = fullScreenRenderWindow;
global.actor = actor;
global.mapper = mapper;
global.marchingCube = marchingCube;