# Shadow analysis

**URL:** <https://community.cesium.com/t/shadow-analysis/8530>\
**Category:** CesiumJS\
**Created:** [August 7, 2019, 10:08am UTC](https://community.cesium.com/t/shadow-analysis/8530 "2019-08-07T10:08:32Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Dhana\_lakshmi](https://avatars.discourse-cdn.com/v4/letter/d/c5a1d2/32.png) [@Dhana\_lakshmi](https://community.cesium.com/u/Dhana_lakshmi)\
**Post date:** [August 7, 2019, 10:08am UTC](https://community.cesium.com/t/shadow-analysis/8530/1 "2019-08-07T10:08:32Z")

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

**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.**

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

Shadow analysis

**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.**

Hi Team ,

I’m relatively new to Cesium and have taken a look at the documentary as well as the source code of the software. The ShadowMap seems to handle the calculation of shadows in relation to the sun as a light source. Can you share any formula details to find how much percentage of shadow is visible on building.

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

cesuim 1.45, windows,google

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<div class="post-metadata">

**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:** [August 13, 2019, 10:19pm UTC](https://community.cesium.com/t/shadow-analysis/8530/2 "2019-08-13T22:19:10Z")

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We do have a set of tools built on CesiumJS to do this kind of analysis:

[https://cesium.com/ion-sdk/](https://cesium.com/ion-sdk/)

This is currently available as a separate commercial package, but should be coming to Cesium ion sometime in the next few months.