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"

Light build black shapes problem

Hello all ! I post here because I don't have any new idea for fixing my problems. I created a scene in unreal and, when the light build comes, I discover a lot of things but with the help of great people on the internet I fixed a lot of problems but I still get some really strange things :/ Screen taked after a "High" light build. First, on couple walls in a room I get this big black things : https://imgur.com/qG2I2GP Light only screen version : https://imgur.com/kUjEyfS

Second, I have an orange light, I touch the parameters etc but I still get some small light of her in other room like this : https://imgur.com/mArMWZA The light passtrought but very small, and the area of the light is not in this room.

Next, in the same room of the orange problem, my wall have an opacity maps but the light don't passtrought the little holes like this here : https://imgur.com/SBuRbw7 (the blue walls, that don't get shadow by the way).

And the final things but I think it's a uv things, the black walls here : https://imgur.com/e31SnXS

So, problem list finished. I want to add, all the walls have a 512 lightmap resolution. I have Lightmass Importance Volume (all the object are in the area).

My world settings : https://imgur.com/QIDDPqG

I hope you can help me on this, I can't found any other idea If you need any other informations, ask me.


Product Version: UE 4.18
more ▼

asked Mar 22 '18 at 07:30 AM in Rendering

avatar image


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

1 answer: sort voted first

Did you take a look at the lightmap UV's of those meshes?

It's weird that it looks pretty good in the lighting only. And the shadows in the first picture don't match those of the lighting only. Maybe you need to change the wall material.

btw. I don't think you need to set the Indirect and Sky Bounces that high. You can easily half those values. Especially if you want to find the light error first.

more ▼

answered Mar 31 '18 at 01:24 PM

avatar image

40 1 3 9

(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