How to extract the dataArray values within a rectangleWidget or shapewidget in vtk.js?

I am trying to develop a region of interest/ROI and a histogram(Piecewise Gussian Widget) corresponding to that ROI. Is there a way to extract the vtkImageData within the region or the dataArray within the ROI?

Thanks in advance.

I would suggest you try to prototyptñe it on Slicer first

You have labelmaps segmentation tools and filters, all you need

@mau_igna_06 except the JS part as slicer is based on VTK C++.

If you ROI is IJK based, you should be able to easily iterate through your array with 3 nested loops to compute the proper 1D array index.

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