Entity geometry outlines are unsupported on terrain. Outlines will be disabled.

I am trying to make a polygon with an outline on terrain. Will this ever be supported in the future? Attached is a sandcastle example of me trying to change the color and add an outline. Windows 10, latest Chrome, Cesium 1.55.

I can comment the part in the code that disables the outline and it will draw but I don’t know what that may break down the line.

https://cesiumjs.org/Cesium/Apps/Sandcastle/index.html#c=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

This is definitely a feature that has been requested a lot, see:

I would bump that issue to convey your interest and keep up to date with any updates. It looks like there’s already some work done to support this but there’s a few more problems to solve to get it to work well in the general case.