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"

Strange Lightmap artifacts on simple geometry

Hey there,

I am relatively new to using UE 4, so I hope this issue has not been discussed before. I used search on the answerhub and in google, but could not find any solution to my problem.


I have a simple szene-setup with a floor, a room and a roof. The lighting works pretty well on every asset except for the roof, althoug it has a veeeeeeeery simple geometry. It is little more detailied by now, because I thought it might be caused by not having enough polys or something, but that did not work either.

The result looks like on every quad-edge there seems to be an error (looks like a shadow). I used a customized lighting UV, just so that everything could be computed in the best way. You can see both screenshots attached. I don't know what I do wrong, because I did nothing different than when importing the floor and the room and these two assets do not behave like the roof. Any ideas?

alt text

alt text

Product Version: UE 4.7
01.jpg (115.4 kB)
02.jpg (127.6 kB)
more ▼

asked Jun 16 '15 at 06:53 AM in Rendering

avatar image

1 1 2 1

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

1 answer: sort voted first


Modular building has some issues. How to fix it you can read in this thread:


more ▼

answered Jun 16 '15 at 07:06 AM

avatar image

8.5k 254 42 400

avatar image CASA_MT Jun 16 '15 at 09:05 AM

Thanks for the link, I got rid of this problem although I did not really do it the way it is described there. I refined my lighting UV and re-imported the mesh. After the re-import, UE4 auto-generated a UV-channel 2 with new orientations of the UV-islands. Instead of using my own created channel (which would be channel 1), I used the new auto-generated. The result is pretty good. With my own created channel, it still does not work though, not sure why -.-

But thanks anyway for the quick response ;)

(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