Merge branch 'entity-polygon' of github.com:AnalyticalGraphicsInc/cesium into entity-polygon

Author: hpinkos

CHANGES.md

@@ -6,7 +6,8 @@ Change Log
 ##### Additions :tada:
 * Added support for loading Draco compressed Point Cloud tiles for 2-3x better compression. [#6559](https://github.com/AnalyticalGraphicsInc/cesium/pull/6559)
 * Added `TimeDynamicPointCloud` for playback of time-dynamic point cloud data, where each frame is a 3D Tiles Point Cloud tile. [#6721](https://github.com/AnalyticalGraphicsInc/cesium/pull/6721)
-* Added `CoplanarPolygonGeometry` and `CoplanarPolygonGeometryOutline` for drawing polygons composed of coplanar positions that are not necessarliy on the ellipsoid surface. [#6769](https://github.com/AnalyticalGraphicsInc/cesium/pull/6769)
+* Added `CoplanarPolygonGeometry` and `CoplanarPolygonGeometryOutline` for drawing polygons composed of coplanar positions that are not necessarily on the ellipsoid surface. [#6769](https://github.com/AnalyticalGraphicsInc/cesium/pull/6769)
+* Improved support for polygon entities using `perPositionHeight`, including supporting vertical polygons.  This also improves KML compatibility. [#6791](https://github.com/AnalyticalGraphicsInc/cesium/pull/6791)
 
 ##### Deprecated :hourglass_flowing_sand:
 * Support for 3D Tiles `content.url` is deprecated to reflect updates to the [3D Tiles spec](https://github.com/AnalyticalGraphicsInc/3d-tiles/pull/301). Use `content.uri instead`. Support for `content.url` will remain for backwards compatibility. [#6744](https://github.com/AnalyticalGraphicsInc/cesium/pull/6744)