Scaling of some tilesets in 2D mode

[chris-cooper]

There is a strange scaling being applied to tiles in this scenario:

• SceneMode.SCENE2D
• mapProjection: new Cesium.WebMercatorProjection()
• tileset uses a geographic region for the tiles rather than bounds

Sandcastle example

You can see the effect on features near the edge being scaled towards the centre (highlighted in red):

The result on another tileset:

[ebogo1]

Thanks for opening the issue @chris-cooper. I wonder if this is related to #5112... @lilleyse what do you think?

[chris-cooper]

Thanks @ebogo1 , the gaps are only in one direction with the default GeographicProjection as in the issue you linked

[chris-cooper]

This appears to be fixed with the projectTo2D option: #10384