Search in
Sort by:

Question Status:

Search help

  • Simple searches use one or more words. Separate the words with spaces (cat dog) to search cat,dog or both. Separate the words with plus signs (cat +dog) to search for items that may contain cat but must contain dog.
  • You can further refine your search on the search results page, where you can search by keywords, author, topic. These can be combined with each other. Examples
    • cat dog --matches anything with cat,dog or both
    • cat +dog --searches for cat +dog where dog is a mandatory term
    • cat -dog -- searches for cat excluding any result containing dog
    • [cats] —will restrict your search to results with topic named "cats"
    • [cats] [dogs] —will restrict your search to results with both topics, "cats", and "dogs"

Can't build lighting after patch 4.0.2

I don't know why but since the patch, I can't build lightning in my scene anymore. It start calculating it but it stays at 0% for a few second and then it disapears a few seconds later without making any changes in the scene.

Am I the only one having this issue? Poor soul in need of help

Product Version: Not Selected
more ▼

asked Apr 06 '14 at 07:09 AM in Bug Reports

avatar image

21 2 3

avatar image Adam Davis STAFF Apr 06 '14 at 04:43 PM

Hi underfox,

Is this occurring in a blank project with the default map or does it occur only in a particular project? Thank you!

avatar image underfox Apr 07 '14 at 05:33 AM

Hello Adam Davis, thank you for your answr

As far as I know, It only hapen when I open something from this project

link text

as for the logs there are 10 diferente textlogs file in the logs folder, it's probably a stupid question but which one do you need?

I uploaded the latest one, let me know if it isn't the one you need.link text

dxdiag.txt (50.1 kB)
logs.txt (16.4 kB)
avatar image Adam Davis STAFF Apr 07 '14 at 02:05 PM

Hi underfox,

Try to create a new level in this project. Then in the blank level build the lighting and let me know if it allows you to do that or if it gives you the same error. Thank you!

avatar image underfox Apr 07 '14 at 02:12 PM

Hi adam,

Yes it does let me build the lightning in a new scene in this project.

avatar image Adam Davis STAFF Apr 07 '14 at 03:08 PM

Hi underfox,

If you could follow these steps to produce the specific log we need and post it here it may help us to determine what is going on:

  1. Open your project on the level with the lighting issues.

  2. Go under the build drop down menu - select "build lighting only"

  3. Once this finishes (or quits), go to Documents>Unreal Projects>YourProjectName>Saved>logs.

  4. Go to the very first log.txt on the list (it should be the most recent one), and send me that log.

We want to compare this to your other log as well as ours to see what may be occurring. Thank you!

avatar image underfox Apr 07 '14 at 03:28 PM


here it islink text

Thanks again for the help, really appreciate.

logs.txt (126.9 kB)
avatar image underfox Apr 08 '14 at 12:00 AM


Yes,I followed the steps as you told me to. Build drop down menu > build lightning only. Nothing happend

avatar image Stephen Ellis ♦♦ STAFF Apr 08 '14 at 07:19 PM

Hi underfox,

Do you get any different results if you use a small LightmassImportanceVolume in the level?

avatar image underfox Apr 08 '14 at 07:44 PM

Hi stephen,

I just tried and it had no results. It still try to build lightning but it stays stuck at 0% and then disapear without making any changes whatsoever to the scene.

(comments are locked)
10|2000 characters needed characters left
Viewable by all users

1 answer: sort voted first


I found the reason why it I couldn't build light. Basicaly I created and worked on this project on another account from this PC ( which still exist but somehow is unstable because of firefox ) so I started working on the admin account of this computer, more stable but unfortunatly unable to build light. So I logged on the other account again and I tried building light on it and everything worked fine.

Do you have any idea why the admin account can't build light and the normal account can?

more ▼

answered Apr 09 '14 at 04:41 AM

avatar image

21 2 3

avatar image Adam Davis STAFF Apr 17 '14 at 04:24 PM

Hi underfox,

Unfortunately I am not aware of any reason this would occur. I am happy to hear you found the issue and are able to continue working, however the admin should be able to access all information present on the PC. I will try to find an answer to this and if I do manage to find one I'll get back to you on it. However I am marking this question as answered for tracking purposes. Thank you and have a great day!

(comments are locked)
10|2000 characters needed characters left
Viewable by all users
Your answer
toggle preview:

Up to 5 attachments (including images) can be used with a maximum of 5.2 MB each and 5.2 MB total.

Follow this question

Once you sign in you will be able to subscribe for any updates here

Answers to this question