Thanks for your response @MARvizer.
Here is an example of the shimmering:
https://www42.zippyshare.com/v/XHxTGOfJ/file.html
The foreground and the rock on the left are stable, in the centre the pixels are shimmering in a band extending to the right, the top of the cliff is stable.
The file has been encoded but the encoding isn't causing the shimmering to stop at the rock on the left.
I see!
So shimmering is only happening along a horizontal band, right? But it's not a bug, but a design "mistake". It's a post process effect added to the scene and, for some reason, they have limited it to that certain height. With a simple tweak to the effect I have extended it up to the top of the cliffs too. So it's a design issue, but not a bug.
Best regards!
I understand this better now after more testing, there are only 3 layers for this shimmering in the light part of the demo. The near plane, the middle plane and the far plane. The shimmering effect is being applied to the middle plane only, ie horizontally the middle 1/3 of the screen. It is also being occluded by objects in the near plane which is correct.
However a real heat haze should continue from the middle plane to the far plane and be more pronounced in the far plane (like Nanite it should be calibrated) but it is only being applied to the middle plane and then it stops for some reason.
