deepCopy in vtk.js

stoune · June 9, 2023, 1:14pm

Hi,

In the C++ version we can deepCopy a polyData, but in vtk.js I don’t know how to do it because there is not deepCopy function callable from the polyData object, is there a way to do it?

Thank you

Forrest · June 9, 2023, 2:24pm

You can do vtkObj.getJSON(), deep copy the result using whatever JS mechanism/library you want (e…g structuredClone), then use vtk(copy) to make a new copy.

Sebastien_Jourdain · June 9, 2023, 2:25pm

There is a naive way like so

dsDest = vtk(dsSrc.getState())

stoune · June 9, 2023, 3:53pm

Thank you @Forrest , Thank you @Sebastien_Jourdain

But from where I can import vtk() please?

Sebastien_Jourdain · June 9, 2023, 11:03pm

github.com

Kitware/vtk-js/blob/master/Sources/vtk.js

import globalThisShim from 'globalthis';

export const vtkGlobal = globalThisShim(); // returns native globalThis if compliant

const factoryMapping = {
  vtkObject: () => null,
};

export default function vtk(obj) {
  if (obj === null || obj === undefined) {
    return obj;
  }
  if (obj.isA) {
    return obj;
  }
  if (!obj.vtkClass) {
    if (vtkGlobal.console && vtkGlobal.console.error) {
      vtkGlobal.console.error('Invalid VTK object');
    }
    return null;

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stoune · June 12, 2023, 11:30am

Thank you !