x

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"

Movable light bleeds through static mesh

Hello. I know there are lots of questions and answers regarding to this issue. But non of them are solid solutions. I have a bookshelf with 2 cm thick walls, and movable light. Light bleeds through wall of shelf. Tried changing shadow bias and sharpen filter, it lets me to lower the bleeding but does not solve it completely. Also I do not use any lightmap UVs as my lights are all movable. And I know, making thick walls is a workaround for this. BUT

I just want to know how to solve it completely if possible. Or are you planning to fix this issue on some next versions?

Product Version: Not Selected
Tags:
more ▼

asked Dec 28 '14 at 05:11 PM in Rendering

avatar image

Nicat
198 17 17 25

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

2 answers: sort voted first

Hi Nicat,

I want to go ahead and preface that this is not a bug and changing a couple of parameters in your movable (dynamic) light will help with this.

Without seeing a screenshot of your specific issue, I'll use a broad example that should help regardless. There are limitations with using movable lighting with cascaded shadow maps and I'll discuss those at the end.

Select your movable light:

You'll want to adjust the following settings to get a result that works for you: Shadow Bias and Shadow Filter Sharpen.

In the following examples I'm using the architecture meshes from the starter content.

1) Shadow Bias: 1 and Shadow Filter Sharpen: 0

Here you can see a lot of bleed created by the shadow bias.

alt text

2) Shadow Bias: 0.5 (Default Setting) and Shadow Filter Sharpen: 0

In this you can see with the default settings you still get a little bit of bleed around the bottom corners

alt text

3) Shadow Bias: 0.0 and Shadow Filter Sharpen: 0

Here you can see the artifacting cause by cascade lines by adjusting the shadow bias too low.

alt text

There is no clear simple answer when using Dynamic lighting without employing some other methods of lighting as well. Using thicker walls, static lighting with lightmap UVs, or even using Ray Traced Distance Field Soft Shadows (a new form of dynamic shadowing in the editor) can help, but the last suggestion still has some limitations with landscapes and a few other things.

If you need sharp shadows using a combination of static lighting and dynamic lighting would be the best result.

Thank you!

Tim

movablelight_1.png (583.7 kB)
movablelight_2.png (634.8 kB)
movablelight_3.png (573.8 kB)
more ▼

answered Dec 29 '14 at 04:14 PM

avatar image

Tim Hobson ♦♦ STAFF
48.9k 887 101 877

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

not working

more ▼

answered Jan 28 '17 at 12:24 PM

avatar image

Glitch5970_UE4
1

(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