Jagged edges at high levels of zoom
After zooming in quite far, some meshes produce jagged edges where they intersect other objects. Here is an example:
The rock formation on the right is a static mesh about 3.5km away from the camera and forms a jagged line where it intersects with the terrain. It only has 1 LOD and looks fine up close. Is this just a limitation to rendering at this range or is there a simple fix?
Some additional information. Two overlapping static meshes will cause this effect, but I believe the landscape is also affected due to some odd shadows I have seen. The effect is not noticeable on small meshes, but can be observed when they are scaled up.
The film grain effect is intentional and not part of the problem.
asked Jul 16 '15 at 05:55 PM in Rendering
As stated in this post this issue is due to z-fighting between the two meshes. Zooming in so much effects the precision of the depth buffer. As a result the bug has been marked as "won't fix" since there isn't really much else to be done for such an extreme case. https://issues.unrealengine.com/issue/UE-18828
answered Nov 07 '16 at 09:21 PM
I was able to recreate the jagged edges that you are experiencing. This does appear to be a bug. I was able to get the same result with and without World Position Offset. I have entered a ticket and someone in the development department will look into it. The ticket number is UE18828
answered Jul 17 '15 at 08:09 PM
I got some feedback from the development group. What you experiencing is the Zfighting between the two meshes. At the extreme distance that you are trying to zoom from the render is trying to calculate which shader should be on which object, as well as separate the light maps. There is no fix for what is occurring. The general consensus is either not zoom that far in or use something like a post processing effect to blur objects at that distance. Human eyesight cannot see that sharply at 3.5km without the aid of binoculars and such. Even then the image enlarged is distorted some what to us.
Some options for you are:
answered Jul 20 '15 at 02:28 PM
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