# BSP breaking down **URL:** \ **Category:** Rendering\ **Tags:** unreal-engine, bsp, Rendering, question\ **Created:** [June 29, 2017, 6:32pm UTC](https://forums.unrealengine.com/t/bsp-breaking-down/396783 "2017-06-29T18:32:33Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Dante01](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Dante01](https://forums.unrealengine.com/u/Dante01)\ **Post date:** [June 29, 2017, 6:32pm UTC](https://forums.unrealengine.com/t/bsp-breaking-down/396783/1 "2017-06-29T18:32:33Z")
Hey I have a bit of problem here which I cant seem to solve although I read whole documentation on the subject. I am currently building basis of my level out of BSP brushes and my brushes refuse to cooperate they just break down with no reason, there should not by any significant amount of overlapping in the level so far to my knowledge. Can you please look at this picture and tell me what could be the problem here? Anyways is there a quick way to find overlapping in UE4? Thanx a lot in advance. ![191412-bsp.jpg](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/5/6/2564889810e6f4f9054dbee0ad50e2b31c76d44a.jpeg) ---
**Author:** ![redbox](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@redbox](https://forums.unrealengine.com/u/redbox)\ **Post date:** [June 30, 2017, 2:20am UTC](https://forums.unrealengine.com/t/bsp-breaking-down/396783/2 "2017-06-30T02:20:21Z")
You shouldn’t use brushes for such complex geometry. Better to optimize it, use as semi-solid brushes, or even convert it to static meshes. There is bsp tessellation view, Alt + 1 or Alt + 2, in which you can see actual bsp polygons geometry. > **[A new, community-hosted Unreal Engine Wiki](https://forums.unrealengine.com/t/a-new-community-hosted-unreal-engine-wiki/141494)** > > After over a year in maintenance mode, the official Unreal Engine Wiki is now permanently offline. These resources now live on a new community-run Unreal Engine Community Wiki — ue4community.wiki! You will be able to find content from the official... [https://docs.unrealengine.com/udk/Three/UsingBspBrushes.html](https://docs.unrealengine.com/udk/Three/UsingBspBrushes.html) ---
**Author:** ![Dante01](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Dante01](https://forums.unrealengine.com/u/Dante01)\ **Post date:** [June 30, 2017, 10:59am UTC](https://forums.unrealengine.com/t/bsp-breaking-down/396783/3 "2017-06-30T10:59:13Z")
yes, thanks a lot man, ez fix, converted all brushes to semi-solid and it works just fine…