Height-based shader in Processing 3D

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I am developing a health-care application in processing. I am rendering a 3D spectrogram chart of an EEG (a test 30hz sine wave and some noise in the picture). enter image description here

The thing is that I would like to color the chart depending on the point's z value.

Unfortunately, all the chart is a PShape, since I modified Dan Siffmann's version.

However, I think I could use Shaders. Maybe I have misunderstood the concept, but could I do it that way with Hue values from 0 to 220?



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