[vtkusers] Create PolyData in vtk.js

[marf]

Ok, I solved it now, by taking the connectivityarray and translating it into
a format for polyData which kind of looks like this 

numberOfPoints idOfPoint1 idOfPoint2 idOfPoint3 numberOfPoints idOfPoint1
idOfPoint2 idOfPoint3

e.g. 
polys = [3, 0, 2, 1, 3, 1, 2, 3, 3......] (this would only be triangles)
points = [0.1, 0.5, 9, 0.5]

Then I passed this to the polydata via

polydata.getPolys().setData(polys);
polydata.getPoints().setData(points);

and provided it as the modeloutput with
model.output[0] = polydata;

So this worked nicely, but there is also more information that I would have
to display by coloring cells or points, can someone help with that please?



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