Editor Viewport Rendering Bug
For several engine version so far (4.3, 4.5 and 4.6), I have been getting some strange visual glitches in the main viewport of the editor, as well as in all 3D views in other editors.
I think the issue speaks for itself:
As you can see, the entire viewport is heavily blurred, editor billboards are permanently rotated sideways, and everything appears to be "stretching" into the centre of the screen.
When PIE is used, it appears slightly different:
While not stretched into the centre, it is clear that the objects are not rendering correctly. The polygons on the terrain that should be hidden are being rendered regardless, and the cube is not being rendered where it would hide the floor mesh. The heavy fogging is still present.
This issue occurs in all preview windows, such as new window and even standalone process. It also affects packaged builds of the affected projects.
As I stated before, this issue has occurred on 3 engine branches I have worked with. The issue seems to not immediately present itself when the new engine is used; rather it may take several weeks for months to present itself. For example, the issue did not present itself in 4.6.1 until today, meaning it has been working correctly on at least 2 projects until now. However, once it appears for the first time, all projects using that particular branch are so far guaranteed to have the issue within around 2-3 start-ups of the editor.
Using the buffer visualiser, I noticed the GBuffer appears to be "inverted" where it should block an object; instead, it will draw what is behind that:
If it helps, my computer's specs are:
The issue makes it almost impossible to continue development on the affected projects and is extremely frustrating. Any solution or possible explanation of this bug would be greatly appreciated.
This issue is fixed by setting the Near-Z in the project settings to a non-zero value.
answered Aug 23 '15 at 09:58 PM
When you encounter this in your projects is there anything that you're aware of that causes the change?
Is this something that doesn't replicate immediately in any new projects? If so, how long does it usually take before this starts to happen?
Do you have a simple test project that has this issue that you'd be willing to share and see if I can get the same results on my end? This can help narrow down if something may be going on hardware/driver vs Project.
Also, I see you're using the Nvidia 335 drivers. Can you upgrade your drivers to the latest version of 347.25?
Last thing, Just as a test, can you delete your saved and intermediate folders and see if this possibly resolves the issue?
answered Feb 04 '15 at 10:43 PM
Tim Hobson ♦♦ STAFF
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