QuoteDo you have GISD enabled? If so does this still happen if you turn it off? Note that some of the GI parameters (particularly in GISD) *are* dependent on render resolution.
GISD was enabled. I disabled that and reset the GI blur radius back to its default value of 8 and did an overnight rendering. Same result as before:
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Back in my mental ray days I would have called circular artifacts like these "photons" and would have fixed them exactly the same way as here – by increasing the radius. But those were cast from the camera while these seem to be projected along the y axis.
I remember running into this months ago, when I first set up the landscape and there was no grass or other geometry. But it disappeared when I added the trees (hidden by the detail, I guess) and I forgot about it.
This evening I'll try setting up a fresh scene to see if I can reproduce it.
QuoteThis may be caused by either luminosity or reflectivity settings within one or more textures. I often get this with crop renders of highly luminous or reflective items, though it is gone in full and high-detail (non-cropped) images.
Thanks, N-drju. I'm not using luminosity, though there may be some reflection. I'll take this into account when I set up the new scene.