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Update CHANGES for model orientation change #6738

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Jul 2, 2018
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Update CHANGES for model orientation change #6738

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Expand Up @@ -4,7 +4,9 @@ Change Log
### 1.47 - 2018-07-02

##### Breaking Changes :mega:
* glTF 2.0 models corrected to face +Z forwards per specification. Internally Cesium uses +X as forward, so a new +Z to +X rotation was added for 2.0 models only. [#6632](https://github.com/AnalyticalGraphicsInc/cesium/pull/6632)
* glTF 2.0 models corrected to face +Z forwards per specification. Internally Cesium uses +X as forward, so a new +Z to +X rotation was added for 2.0 models only. To fix models that are oriented incorrectly after this change:
* If the model faces +X forwards update the glTF to face +Z forwards. This can be done by loading the glTF in a model editor and applying a 90 degree clockwise rotation about the up-axis. Alternatively, add a new root node to the glTF node hierarchy whose `matrix` is `[0,0,1,0,0,1,0,0,-1,0,0,0,0,0,0,1]`.
* Apply a -90 degree rotation to the model's heading. This can be done by setting the model's `orientation` using the Entity API or from within CZML. See [#6738](https://github.com/AnalyticalGraphicsInc/cesium/pull/6738) for more details.
* Dropped support for directory URLs when loading tilesets to match the updated [3D Tiles spec](https://github.com/AnalyticalGraphicsInc/3d-tiles/issues/272). [#6502](https://github.com/AnalyticalGraphicsInc/cesium/issues/6502)
* KML and GeoJSON now use `PolylineGraphics` instead of `CorridorGraphics` for polylines on terrain. [#6706](https://github.com/AnalyticalGraphicsInc/cesium/pull/6706)

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