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Cloud v3 seam between render tiles?

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arnaudc:
I'm rendering 16k panoramic views using TG4. To keep RAM usage under control I render the scene part by part using tiles. It has 2 cloud layers v3.
Here is part of the render between 2 tiles:


As you can see, there's a sort of seam in the clouds. It looks like the lighting in the clouds v3 is not correctly matching on both sides of the tiles.
GI is ok though.

Is it a bug? What is causing this, and is there anything I can do to prevent it?

WASasquatch:
It seems like scene lighting. Even the slightest change in camera pitch can change scattering/refraction/lighting settings I am sure. It only seems natural, like a camera.

pokoy:
This is probably due to voxel or GI caching which is interpolated in screen space I suppose. I'm not sure if you can render the cache to disk with clouds v3, though.
An obvious solution without saving the cache would be to render both tiles with an additional overlap so you can overlay both of them and mask that area with a gradient.

arnaudc:

--- Quote from: pokoy on March 23, 2018, 09:39:29 AM ---This is probably due to voxel or GI caching which is interpolated in screen space I suppose.
--- End quote ---
Yeah, I was thinking maybe it's because the clouds' voxels don't exist outside the rendered view for some technical reason, making the lighting "incorrect" in the clouds v3 on the borders of the image.


--- Quote from: pokoy on March 23, 2018, 09:39:29 AM ---An obvious solution without saving the cache would be to render both tiles with an additional overlap so you can overlay both of them and mask that area with a gradient.
--- End quote ---
That's an idea. This would complexify my current workflow but it would probably work. I hope I won't have to do that.


--- Quote from: WASasquatch on March 22, 2018, 07:55:07 PM ---It seems like scene lighting. Even the slightest change in camera pitch can change scattering/refraction/lighting settings I am sure. It only seems natural, like a camera.

--- End quote ---
True, but tiles must be seamless, given that I correctly take care of GI. Unless there's something I'm missing with clouds v3.


I just found the "Transition dist. (voxels)" parameter under the optimisation tab of clouds v3 (and v2 too). The wiki doesn't say anything about it, so perhaps it's what I'm looking for, I'll do some testing and report back.

WASasquatch:
Curious question, are you using atmospheric bloom, or bloom?

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