We are regularly experiencing blocky lighting artifacts such as the one visible here:
Testing indicated the following characteristics:
- Happened with the 4.0 and 4.1 branches.
- Happens the same on a number of different hardware/driver configurations.
- Artifacts tend to occur at the edges of geometry.
- Artifacts are always screen-space aligned rectangles.
- Artifacts are camera location dependent. (the flickering seems to be caused by the subtle camera movements of TXAA)
- Artifacts seem to be related to shadowing, for example in the case of this gif, turning off the main sunlight. removes the artifacts. (Note that this is an indoor area that should not get any sunlight)
- Artifacts have also been spotted in some of the example content, however seem to be less frequent/obvious there, probably due to differences in lighting setup.
- Artifacts occur on both static meshes as well as BSP surfaces.
- Artifacts also occur in SceneCaptures.
These issues are quite distracting so a solution would be greatly appreciated.
