In normal vtk we have the Laplace filter and many other mesh smoothing filters. However none of these are available for vtkjs. It would be good to have at least one simple filter for this.
My current project generates a mesh programatically in javascript, I just need to smooth it.
To expand:
I have tried the Marching cubes filter but is not working as it expects a 3D image data, not a mesh
vtkPolyData=...; // the data
// This doesn't work
let meshSmoother = vtk.Filters.General.vtkImageMarchingCubes.newInstance({computeNormals: true, mergePoints: true});
meshSmoother.setInputData(vtkPolyData);
globalScene.mapper.setInputConnection(meshSmoother.getOutputPort());
// However, this works fine (unsmoothed)
globalScene.mapper.setInputData(vtkPolyData);
The first part launch an exception at reset camera function saying getOrigin is not a function
Uncaught TypeError: a.getOrigin is not a function
at Vf.e.requestData (vtk.js:2:1014101)
at Se.e.update (vtk.js:2:749747)
at s (vtk.js:2:748117)
at Array.n (vtk.js:2:749576)
at Se.e.getInputData (vtk.js:2:749300)
at e.getBounds (vtk.js:2:1279332)
at vtk.js:2:1290265
at Array.forEach (<anonymous>)
at o (vtk.js:2:1289818)
at e.pick (vtk.js:2:1292360)
I didn’t realized the vtkPolyDataNormals were already available
Solution
const smoother = vtk.Filters.Core.vtkPolyDataNormals.newInstance();
smoother.setInputData(vtkPolyData); // Smooth
mapper.setInputConnection(smoother.getOutputPort());
Then to add scalars, add them to the vtkPolyDataNormals directly, not to the original vtkPolyData
smoother.getOutputData().getPointData().setScalars(PDscalars);
