The opacityscale, 'extremes', has constant opacity equal to 1

[empet]

The function createWave()

plotly.js/src/traces/surface/defaults.js

Line 19 in d37895b

function createWave(n, minOpacity) {

generates an opacityscale with all opacities equal to 1, because:

 Math.max(1, Math.min(0, v)) // line 27

is 1 for any v.

Replacing it by:

 Math.min(1, Math.max(0, v)) 

removes the actual drawback, and leads to a non-constant opacityscale.

[archmoj]

@empet Thanks very much for uncovering this bug.