# what is the importance of B3DM ?

**URL:** <https://community.cesium.com/t/what-is-the-importance-of-b3dm/7036>\
**Category:** CesiumJS\
**Created:** [June 17, 2018, 12:25pm UTC](https://community.cesium.com/t/what-is-the-importance-of-b3dm/7036 "2018-06-17T12:25:49Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Manju\_Kumari](https://avatars.discourse-cdn.com/v4/letter/m/f19dbf/32.png) [@Manju\_Kumari](https://community.cesium.com/u/Manju_Kumari)\
**Post date:** [June 17, 2018, 12:25pm UTC](https://community.cesium.com/t/what-is-the-importance-of-b3dm/7036/1 "2018-06-17T12:25:49Z")

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**1. A concise explanation of the problem you’re experiencing.**

why we use b3dm file in the json file ?

and suppose i already have b3dm file of particular region … then how to create a json file …and run on cesium ?

please anyone explain me ?

**2. A minimal code example. If you’ve found a bug, this helps us reproduce and repair it.**

**3. Context. Why do you need to do this? We might know a better way to accomplish your goal.**

**4. The Cesium version you’re using, your operating system and browser.**

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**Author:** ![Gabby\_Getz](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/gabby_getz/32/7838_2.png) [@Gabby\_Getz](https://community.cesium.com/u/Gabby_Getz)\
**Post date:** [June 18, 2018, 8:57pm UTC](https://community.cesium.com/t/what-is-the-importance-of-b3dm/7036/2 "2018-06-18T20:57:29Z")

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Take a look at the [3D Tiles specification](https://github.com/AnalyticalGraphicsInc/3d-tiles/tree/1.0/specification) for a starting point.

You can load valid 3D tiles in Cesium like in[this example](https://cesiumjs.org/Cesium/Build/Apps/Sandcastle/index.html?src=3D%20Tiles%20BIM.html&label=3D%20Tiles).