Hi,
As I’ve understood it (correct me if I´m wrong) it should be possible to activate outlines for 3D Tiles using the CESIUM_primitive_outline extension. I’m not sure however how to make this work. Does the tileset need to be prepared in a certain way?
Thanks
Hi @eriblan,
Just to confirm, the models in your tileset already include the CESIUM_primitive_outline extension, correct? The showOutline option will have no effect on tilesets / models without this extension built into their glTFs.
If they do contain the extension, then do you have a Sandcastle, if not a sample model, that replicates what you’re seeing?
Hi,thank you for the reply.
The models in the tileset does not already include the extension. I think the question is about if the extension also could be applied to Cesiums other 3D tiles formats (like b3dm), I suppose it can´t.
Or if there is another simple way of creating outlines for those other formats.
Overall, I´m a little bit confused by the different formats and the nomenclature used in some places 
Hi @eriblan,
Yes, the extension can also be used in other 3D Tiles formats, provided that they are formats that contain glTFs. Batched 3D Models and Instanced 3D Models are two such formats; both of them contain glTFs with some other data for features / instancing respectively.
As an example, Cesium OSM Buildings is a tileset containing b3dms, each of which embeds a glTF with the CESIUM_primitive_outline extension. You can also use tilesets containing pure glTF content (via the 3DTILES_content_gltf extension), and if those glTFs have the outline extension they should display. Support for this is already in main, but will be officially shipped in the CesiumJS 1.97 release.
HI @janine ,
I have included the extension to my glTF file but I could not show the outline.
Could you please give me advice?
Thank you,