I Have a fairly medium sized level. Currently it has about 150 actors or so and it’s only made on 1 side. I want to mirror the level so I select all the actors and duplicate and translate them to other side and then the Buiding BSP message comes and at 74% the engine crashes.
Sometimes Happens with low Hard drive space.
But there is tons of free spce on my HDD 
Hi Himy,
Please post your DXdiag (Windows) or list your System Specs (Mac). Duplicating and transforming that many actors is going to take a lot of RAM. You may consider making 4 or 8 Groups in the World Outliner and copying and moving in smaller groups.
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Here is my DxDiag…I have tons of ram and HDD. I will try doing in groups.
In the meanwhile, is it just because im moving a lot of stuff or is it a serious underlying problem?
UPDATE : I tried moving actors in smaller groups as you suggested and the first group went fine. The other groups, no matter how smaller I make it, dont and the engine crashes.
I also tried switching off the “Update BSP Automatically” and then move and then build but, then the engine crashes while biulding.
Please help, I am worried as I have a deadline and need to produce my work to my teacher.
I have not been able to reproduce this with multiple instances of static meshes etc… Can you either list some of the various actors you are working with or, if you’d like, you can send a link to your zipped project via Dropbox, Google Drive, or similar to me in a private message on our .
Also when doing smaller chunks, be sure to save after each move. I’ve looked up your crashes on our Crash Reporter site and this is definitely tied to memory, among other things.
Try grouping (in the world outliner) and moving like items (ie. all static meshes, then bsp brushes, etc.) Save after each act in order to preserve memory.
The project file is too big for me to upload sadly but, all I have on the level (Yes, the project has only one level) is just geometrical shapes. I have not added any sort of other content at all.
Just to be clear, you would not be able to upload your project here. Instead you would zip your entire project, upload it to a source like Dropbox or Google Drive, then send the download link to me in a private message on our . If you cannot do this, it’s not a problem. However, I am unable to reproduce this using our Starter Content static meshes and random BSP brushes. -I highly suspect you are running out of VRAM (which was not included in the image you posted above.)
I suggest restarting your computer then open Unreal only so you are starting with completely free RAM and VRAM. In your World Outliner group static meshes separately from BSP brushes. Start mirroring smaller groups of static mesh brushes. Be sure to save all after each move.