Lightmap resolution: Dark artifacts on Static Meshes

Development Rendering
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1

Hello world,

Could someone help me understand or suggest an approach to fix the following.

When i open a level (initial load) or rebuild the lighting, the static meshes (SM) have some sort of shadow artifacts.

200239-shadowartifacts_1.jpg
200239-shadowartifacts_1.jpg939×747 96.5 KB

However, if i move closer, they disappear and will not return unless i open the level once again or rebuild light.

200240-shadowartifacts_2.jpg
200240-shadowartifacts_2.jpg915×765 95.4 KB

Setup:

  • 4 static directional light & 1 stationary skylight in persistent level
  • Sub-Level containing all the Modular SM is streamed via blueprint on begin play
  • SM have single LOD.
  • Lightmap resolution (under SM settings) varies from 32 to 256 depending on the SM.
  • Min Lightmap resolution (under LOD 0 - build settings) is 64
2

Hello hellwitu

I can see the artefacts clearly. I think that is a lightmap issue. Did you ever get “lightmap” error after building lights?

You can also check this document about preparing UV’s for lighting.

3

Hi Kemal,

No errors with build.

All the assets showing the artifacts were originally BSP assets which were later converted to SM.

The artifacts appear only when the level is loaded / rebuilt.
When the assets are viewed closer through the viewport they disappear and do not appear again irrespective of the the distance they are viewed from. It would seem that a lower res is initially loaded and the higher res is streamed on demand.

Im currently looking into texture streaming to investigate if it has anything to do with it.

4

I was thingking the same thing. Goodluck with it.

5

Bump: Could still use some help. Haven’t been able to crack this one yet.

6

Project settings → Rendering → disable texture streaming. \^(0_o)^//
Note: it does come at a cost by loading all used textures at max configured res. I was able to reduce the asset’s lightmap & texture res though,. Thereby reducing the texture memory usage.

7

If it’s really because of texture streaming, you should be able to find the culprit by enabling it again and disable MipMaps in the textures you think might affect the shadows. Just to make sure you tested everything <3

8

Will revisit to optimize them later after reading further into tex streaming.
Will check performance gain with texture streaming when i resume mobile testing.

9

Greetings World,

Thought its only fitting to end this post with a demo of the game.

Gameplay Demo: Chakravyuh - Alpha Gameplay Demo at Godlike Difficulty - YouTube

On another note, this forum obviously has a lot of skilled pros and enthusiasts around.

It would be wonderful if you could share your thoughts/feedback for me to work on.

10

well what happened because I am having the same issues