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"

Static mesh tri's change with light

I am not sure how UE4 decides to render a static mesh and when?

but here is my problem:

my scene has approximately 180k tris in the screenshots, when the light intensity is is above 0.5 my total tri count jumps over 5 million.and causes lag.

where does it come from? (the landscape is very large and I assume this is where the issue originates from, but doesnt UE4 terrain only render the visible geometry ?

please explain if this is somewhat common sense :)

Dynamic Light on alt text

Dynamic Light off

alt text

Product Version: UE 4.16
light.jpg (111.6 kB)
dark.jpg (84.0 kB)
more ▼

asked Sep 19 '17 at 04:56 PM in Rendering

avatar image

25 1 1 5

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

1 answer: sort voted first

The triangle increase comes from having to render everything relevant into the shadowmap, for every cascade. The geometry might not be visible to the camera, but this geometry might still contribute to the shadow, hence the increase. Try adjusting shadow settings, including distance and number of cascade splits, aswell as doing more aggressive LOD transition on your landscape. Also consider using world composition with level LODs, if your landscape is indeed that large.

more ▼

answered Sep 19 '17 at 07:39 PM

avatar image

7.9k 130 31 293

avatar image ScRuFFnuF Sep 20 '17 at 06:34 AM

Hi Deathrey,

You pointed me in the right direction, there are still a lot of issues but at least now I know where to focus.

Thank You :)

(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