How can I load streamline (.vtk or .trk),and show it?

Web
9

I try it,no effect

const fullScreenRenderer = vtkFullScreenRenderWindow.newInstance({
      // background: [0, 0, 0],
});
const renderer = fullScreenRenderer.getRenderer();
const renderWindow = fullScreenRenderer.getRenderWindow();
const reader = vtkPolyDataReader.newInstance();
reader.setUrl(`dti/0000_str.right.vtk`).then(() => {
        const polydata = reader.getOutputData(0);
        const mapper = vtkMapper.newInstance();
        mapper.setColorModeToDirectScalars();
        mapper.setInputData(polydata);
        mapper.setColorByArrayName('colors');
        const actor = vtkActor.newInstance();
        actor.setMapper(mapper);
        renderer.addActor(actor);
        renderer.resetCamera();
        renderWindow.render();
});