Anyone else seeing US4.25.1 geometry blinking?

Development Rendering
1

Parts of CSG geometry sometimes ends up blinking on my system. Windows 10, recent patches, GeForce GTX 1080 Ti, latest “game ready” drivers 451.48, an Acer G-sync display.

[video]https://watte.net/blinky-unreal-editor-geometry.mp4[/video]

Note that it seems intermittent in this video; that’s a sampling artifact because the desktop video capture is 60 fps but the editor runs faster than that. The actual blinking seems to be every other frame.
There’s also a possibly-related problem with texture warping at the same rate on CSG geometry.

Sometimes, the geometry even disappears entirely:

[video]https://watte.net/unreal-editor-geometry-disappears.mp4[/video]

And it happens when I convert the CSG blocks to static geometry, too… I’m starting to wonder if this is some kind of hardware problem.

2

For a second I thought it was Z fighting with the level grid, but moving it down a bit still didn’t fix the blinking.
Other, more complex levels, don’t have this problem, so it has to be some kind of timing problem. Turning off G-sync doesn’t help, though.

3

Does the landscpe . Scratch that. Tessellation is on by default since .18 I think.
either disable it within the material. Which Should fix this.
or bump the z positive bound of the level up by 10 to 50.
50 if you expect a distance father than 1km to still be completely flat.

That normally fixes it.

4

Interesting! I’ll try that, thanks!