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Which interpolation method plot.ly uses for the heatmaps?

I’m writing a report and I will use a heatmap graph done with plot.ly for that. The heatmap plots 3 (X, Y and Z) variables and fill the empty spaces with interpolation. Thus, I need to describe what was the interpolation method used for that. Does anyone know or could any plot.ly engineer help me with that? Thanks!

Heatmap traces support three fill types:

  • zsmooth: 'best' (which interpolates in data space),
  • zsmooth: 'fast' (which interpolates in pixel space) and
  • zsmooth: false (the default, which displays the heatmap as bricks).

See http://rickyreusser.com/plotly-mock-viewer/#zsmooth_methods for example of all three methods.

If you’re looking for implementation details, see this source file and more specifically this block.


By the way, please don’t tag my name on other tickets to grab my attention. It’s annoying for me and for other forum users. I hope you understand that answering your questions was a bit more complicated than the other two tickets I answered previously. Sorry for the (long 4 hour) wait.

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Etienne, the example link is not valid anymore, can you please provide an updated link?