Style Photogrammetry Models with Styling Language

[OmarShehata]

This came out of this forum discussion. If you try this Sandcastle, transparency works! But if you set the photogrammetry variable to true, you'll see it has no effect.

@lilleyse mentioned this was because the styling only applies to features, and this photogrammetry tileset doesn't have any features. A work-around would be to add batch ids where all the values are 0 (see https://github.com/AnalyticalGraphicsInc/3d-tiles/tree/master/specification/TileFormats/Batched3DModel#batch-table), however this is kind of wasteful.

It would be nice if we handled this case where there would be an implicit single feature that would be styled, perhaps?

[cesium-concierge]

Congratulations on closing the issue! I found these Cesium forum links in the comments above:

https://groups.google.com/d/msg/cesium-dev/bpBtoVUQgwA/Yw327kv8BAAJ

If this issue affects any of these threads, please post a comment like the following:

The issue at #7149 has just been closed and may resolve your issue. Look for the change in the next stable release of Cesium or get it now in the master branch on GitHub https://github.com/AnalyticalGraphicsInc/cesium.

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