# Support regarding 3D tiles and GLTF model

**URL:** <https://community.cesium.com/t/support-regarding-3d-tiles-and-gltf-model/10873>\
**Category:** CesiumJS\
**Created:** [September 10, 2020, 8:16am UTC](https://community.cesium.com/t/support-regarding-3d-tiles-and-gltf-model/10873 "2020-09-10T08:16:16Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![sandip](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/sandip/32/1987_2.png) [@sandip](https://community.cesium.com/u/sandip)\
**Post date:** [September 10, 2020, 8:16am UTC](https://community.cesium.com/t/support-regarding-3d-tiles-and-gltf-model/10873/1 "2020-09-10T08:16:16Z")

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I am new to Cesium. Can someone please help me by answering these questions?

- How to implement LOD or HLOD on 3D tiles?

- If we are loading GLTF directly then how to inspecting of individual mesh inside a GLTF model using cesium.js?

- How to add custom features data in 3D tiles?

- Is there and change in 3D mesh structure after converting into 3D tiles?

Thanks in Advance.

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**Author:** ![omar](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/omar/32/1999_2.png) [@omar](https://community.cesium.com/u/omar)\
**Post date:** [September 10, 2020, 3:57pm UTC](https://community.cesium.com/t/support-regarding-3d-tiles-and-gltf-model/10873/2 "2020-09-10T15:57:44Z")

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Welcome to the Cesium community @sandip! What kind of application are you working on?

If you upload your glTF model to Cesium ion it’ll be tiled into 3D Tiles, with levels of detailed created automatically. See: [https://cesium.com/docs/tutorials/import-3d-models/](https://cesium.com/docs/tutorials/import-3d-models/). Cesium ion doesn’t currently supporting adding custom data to parts of the mesh for generic 3D models.

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**Author:** ![sandip](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/sandip/32/1987_2.png) [@sandip](https://community.cesium.com/u/sandip)\
**Post date:** [September 16, 2020, 10:02am UTC](https://community.cesium.com/t/support-regarding-3d-tiles-and-gltf-model/10873/3 "2020-09-16T10:02:16Z")

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Thanks for quick reply.

We are working on IOT based Smart City application where I need to load whole city model with district, building, floor, room etc.

For loading 3D model on map we are looking for some framework and I found that Cesium can help here.

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**Author:** ![omar](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/omar/32/1999_2.png) [@omar](https://community.cesium.com/u/omar)\
**Post date:** [September 16, 2020, 12:45pm UTC](https://community.cesium.com/t/support-regarding-3d-tiles-and-gltf-model/10873/4 "2020-09-16T12:45:38Z")

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What software are you using to export the city model?

If you have it as CityGML or KML/COLLADA, you can upload that with per-feature properties, see [https://cesium.com/docs/tutorials/import-3d-buildings/](https://cesium.com/docs/tutorials/import-3d-buildings/).