Re: Add colour and interpolate an STL file with VTK.JS

That looks correct (respecting what you are asking vtk to draw), you seems
to only have data on a couple of them where you see variation of color
within some triangles.
The rest remain a single color as those values are the same and since you
did not reversed the hue range, those values are probably 0.
So interpolating from 0 to 0 give you a solid color.

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