# Cesium Sensor terrain culling

**URL:** <https://community.cesium.com/t/cesium-sensor-terrain-culling/5472>\
**Category:** CesiumJS\
**Created:** [May 3, 2017, 4:16am UTC](https://community.cesium.com/t/cesium-sensor-terrain-culling/5472 "2017-05-03T04:16:35Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Umar\_Sharif](https://avatars.discourse-cdn.com/v4/letter/u/bcef8e/32.png) [@Umar\_Sharif](https://community.cesium.com/u/Umar_Sharif)\
**Post date:** [May 3, 2017, 4:16am UTC](https://community.cesium.com/t/cesium-sensor-terrain-culling/5472/1 "2017-05-03T04:16:35Z")

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I have developed cesium rectangle sensor 1.32 with cesium 1.32. I have placed sensor at some height looking towards ground.

I found that white rectangle always shows rectangle. If ground is not flat, it should follow ground surface.

Also I think pyramid is always shows in front of everything.  
If pyramid side height is enough tall, bottom should go underground, and hidden by ground.

In this way, I can see where is the intersection between pyramid (camera visibility range) and ground surface.