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"

Ray traced DF shadow black line artifact on landscape

For some reason ray traced distance field shadows produce this weird black line along the termination distance of the shadows. It doesn't seem to be affected by either skylight nor the dominant directional light settings, other than the directional light's DF distance setting.

With DF shadows: http://i.imgur.com/5VvZjUB.png

Without DF shadows: http://i.imgur.com/mAFKex1.png

Product Version: UE 4.16
Tags:
more ▼

asked May 26 '17 at 03:24 PM in Bug Reports

avatar image

jonimake
126 11 19 26

avatar image jonimake Feb 11 '18 at 08:55 AM

This is still a problem in 4.18.

https://i.imgur.com/CIKUekx.png

https://i.imgur.com/OYCqx4H.png

https://i.imgur.com/aLtmtMs.png

Edit: I just noticed that it's somehow related to the far shadows. Far shadow cascade amount is at 1 and setting it to 0 causes the problem to disappear. Increasing cascade count to 2 helps too somewhat, but it's still there.

Edit 2: From a shallow angle (as in when you're standing on the landscape) the problem persists even without far shadows. From a high angle it disappears if I turn off far shadows.

Edit 3: There are also black outlines on landscape against sky and landscape geometry that occur after the distance of the DF shadows:

https://i.imgur.com/R9PMxEs.png vs https://i.imgur.com/Z8gAptj.png

avatar image jonimake Jul 09 '18 at 03:05 PM

Right, still a problem and I think it's somehow related to the fact that distance fields aren't ran at full resolution. If I use r.DFFullResolution 1 the problem goes away but performance tanks quite a bit.

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

0 answers: sort voted first
Be the first one to answer this question
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