# Multiple ClippingPlaneCollections and concave volumes

**URL:** <https://community.cesium.com/t/multiple-clippingplanecollections-and-concave-volumes/6715>\
**Category:** CesiumJS\
**Created:** [March 22, 2018, 9:31pm UTC](https://community.cesium.com/t/multiple-clippingplanecollections-and-concave-volumes/6715 "2018-03-22T21:31:36Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![gelazanskas](https://avatars.discourse-cdn.com/v4/letter/g/59ef9b/32.png) [@gelazanskas](https://community.cesium.com/u/gelazanskas)\
**Post date:** [March 22, 2018, 9:31pm UTC](https://community.cesium.com/t/multiple-clippingplanecollections-and-concave-volumes/6715/1 "2018-03-22T21:31:36Z")

</div>

Hello,

I need to cut out multiple concave polygons from photogrammetry 3D tiles model. I know there is some work going on that. How is it possible to implement the feature sooner? Is it possible to prioritise the work by paying for that feature?

This feature will be used to cut out a region from large photogrammetry model and fill the hole with new building 3D model (proposal presentation).

---

<div class="post-metadata">

**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:** [March 23, 2018, 7:56pm UTC](https://community.cesium.com/t/multiple-clippingplanecollections-and-concave-volumes/6715/2 "2018-03-23T19:56:36Z")

</div>

Hi there,

There are some [clipping plane improvements](https://github.com/AnalyticalGraphicsInc/cesium/blob/master/CHANGES.md#additions-tada) coming in the next release on April 1st (not joking!) that will allow you to cut concave polygons.

Thanks!

Gabby