Hello All,
I am receiving some rather strange lines in my volumetric renders. It does not appear to happen on solids.
Any thoughts on why this may be happening? Also If you have thoughts on how I could make my clouds appear cleaner and more realistic I would appreciate it. I am going for a blanket of clouds that fad off into the distance.
Thank you, specs below.
do you have OSL turned on (assuming cycles)? on my system, having OSL on creates weird black and dimmed bars across the image, and crops up more often with volumetrics. i’ve just kept them off ever since discovering that, and haven’t seen the issue again.
ahh, okay… for me it appears right under where you choose CPU or GPU acceleration for the Cycles engine, just a checkbox.
I had this happen once not too long ago. I had a gigantic cube with a volumetric material on it. Inside the cube was the camera, lights, props, etc. The material on the cube was to be the fog for my scene. Also, inside the cube was 2 smoke sims, one started at frame 60, the other at frame 80. When I started to render the animation in cycles, I saw horizontal lines in my renders. Turns out the lines were caused by the smoke sims.
I set the smoke domains (which had volumetric materials on them) to not rendering until the frame where they started working, then I turned on the rendering of the domains. This solved the problem, the lines were only present when the smoke sim wasn’t working.
IDK why it happened, but you might want to try turning off the rendering of all volumetric objects but one, render it. If no lines, turn on rendering of another volumetric object and render again. Rinse and repeat as needed…
Hope this helps,
Randy
Thank You, I will certainly try this. Make it rather difficult to render out a scene with multiple types of clouds. Hopefully this is just a bug that will be resolved in 4.0
Thank You again.
Hi,
Check out these also:
https://www.reddit.com/r/blender/comments/twbqdf/weird_angular_artifacts_while_rendering_volumes/
https://blender.stackexchange.com/questions/40996/horizontal-lines-showing-in-volume-scatter-shader
Update : This is was rendered out this morning, it uses only one object with a mesh to volume at a pretty high voxel count. Displacement only on the volume.
Cloud render, the lines look more like miss colored bars in this image.
Volume Step Size.
Volume Shape Settings
Volume Modifier Settings.
Thank You.
Thank You for sharing, I have my step size already set to .1 please see my updated images below. I am going to try rendering this out on a different computer as well to see if that has anything to do with it.
Shoots my theory of multiple volumetric objects overlapping each other as the cause of this down. IDK what is causing it, but trying on a different computer probably won’t work or cure the problem.
I did go back into my file where I saw this at and rendered a frame with one smoke domain renderable before it was active (overlapping volumetric objects)
Also just noticed a black vertical line to the left and above the character. That is one edge of the smoke domain cube. And I’m not sure why the most of that image is dark.
Anyway, disable the rendering of the smoke domain and I get this
IDK what is causing this. IDK if our problems are related.
I’ll keep an eye on this thread because I’d like to know what’s causing this.
I did not try any of @goorman suggestions to see if they would help.
Randy
