Moire Artifacts

Known Affected Projects/Templates: Code First Person, Blueprint First Person, Unreal Tournament
Platform: Windows 7 x86-64 SP1
CPU: Intel Core i7 3770 (no suffix)
Memory: 16GB
Video Card: NVIDIA GeForce GTX 670 2GB (337.50)

At a certain distance from certain objects, two issues occur, simultaneously:

  1. A moire artifact - it looks like in the shadowing, almost like z-fighting with its own shadow.
  2. The shadow on the ground snaps a bit smaller (see ground below bottom left corner of affected box in images).

This looping Animated PNG was created by taking a screenshot, moving the camera a very small amount (over some threshold) and taking another screenshot.

Animated PNGs only work in Firefox and Opera 12-and-earlier (before they switched to Webkit). If you are not using Firefox (or Opera 12, for some reason) the two frames are provided below. It would be a good idea opening them both in separate tabs and switching between them back and forth.

Animated PNG

Links to individual frames
Before “getting too far away” (bug not present):
After backing up beyond some threshold (bug present):

Please let me know if any more information is desired.


That’s due to dynamic shadows, because the surface is so close to the angle of the light there isn’t much detail from the shadows to cover that surface

Any workaround or things to avoid?

You can mess with your shadow settings on your light, or if you don’t specifically need dynamic shadows then use static lights and objects so that you can use lightmaps.