I am working on this video where the camera is flying along the ground for around 90 seconds as the sun rises, to save making a massive scene i created a looping terrain and have the camera keyframed to snap back to the start when it loops, to give the illusion that it is just continuously flying. I am using a copy location constraint on the sun and sky in the background, copying the camera movement so it remains in the background (I first used parenting but didn't want the sun and sky to copy the camera rotation, just x location values). For the most part i have the look i want, but when in rendered view the sky and sun look like they get smaller in the last frame of the loop, stutter if you will. Furthermore, when i rendered out the video it was still visible and there was also an orange colour glitch happening every time it looped (I'm guessing these two problems are linked).
To see what i mean its best you look at the project file which i have attached. Am not sure how to fix this glitch or stutter? I thought it was a problem with my keying so i redid them all in different methods but still get the same problem. I then thought the copy location was lagging by a frame but that seemed unlikely as i had the same problem when using parenting. Have been running in circles the last week or so with this so any info or help would be much appreciated, thanks!