Draping KML polyline over terrain

Hi -- I'm unsuccessfully trying to drape a simple polyline from KML data over terrain. The line ends up clamped to 2D when in 3D mode (camera pitch > 0).

I'm using the latest Cesium 1.22.1. Have been pouring through old issues that may be related (e.g. https://github.com/AnalyticalGraphicsInc/cesium/issues/2172). Am just checking if I'm missing something or if this is still an open issue?

Here's the Fiddle example:

I’m loading the KML file with:

A simple polyline in the KML data:
      7.2338038,46.093507 7.2528677,46.0910874


We don’t currently have support for entities on terrain. Tom has been working on adding it though, you can see his progress in this pull request: https://github.com/AnalyticalGraphicsInc/cesium/pull/3903

I think there are just a few things that are keeping it from getting merged into master. We want to make sure that the performance is acceptable.



Thanks Hannah. Will keep an eye on that branch.

I was able to get something decent working with GroundPrimitive polygons, but browser support for it is dodgy right now.