Artifacts when rendering procedural Blenderman with Blender 2.8< (needs updating the assset on Blender Cloud) #86320
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Reference: archive/blender-cloud#86320
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This was not a bug, but an artifact of the solidify with negative offset followed by a bevel modifier [which is just more apparent in 2.8+]
So the task here is just updating the asset on the Blender Cloud with slightly tweaked values on the solidify modifier.
What I have done: on object
Plane.229set the Offset on the solidify modifier from -1.0 to 0.0Here is the updated file (opened, tweaked and resaved in 2.78c)
Blenderman.blend
Original report:
System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce RTX 2080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.72
system-info.txt
Blender Version
Broken: version: 2.92.0, branch: master, commit date: 2021-02-24 16:25, hash:
blender/blender@02948a2cabWorked: Blender <2.79b
Short description of error
Strange artifacts only visible in the rendered frame. Not in the viewport.
Exact steps for others to reproduce the error
Just download the project files from the official Blender site: https://cloud.blender.org/p/gallery/57e5084f0fcf294119c5055c
Open with Blender 2.8<
Press F12
Artifact should appear.
I reduced the .blend to the responsible object:
Blender 2.zip
Added subscriber: @Raimund58
Added subscriber: @deadpin
To further help triage: the problem goes away when using "Clamp Overlap" in the Bevel modifier for that object. Why this only appears as a problem during the full render is still a mystery.
Added subscriber: @lichtwerk
Changed status from 'Needs Triage' to: 'Archived'
Can confirm the behavior (pretty sure it is a not a bug though).
Happens in the viewport as well if subdivision modifier is set to 2 subdivisions in the viewport.
If you look closely 2.79 actually has the same problem/artifact, just a little less extreme:
It is the solidify modifier generating intersecting edges which then the bevel modifier has problems dealing with:
solidify without offset
solidify with negative offset (as in the file)
I think there is no way of preventing the user to set up a solidify modifier in a way that would cause problems with consecutive modifiers.
Sure, bevel code changed in a way that made this more obvious in this special case, but that would not be considered a bug either.
Solution here is to slightly change the mesh or change the offset in the solidify modifier so that such intersecting edges would not be happening in the first place.
Thanx reporting, nice find, but I dont think we can really chase this further as a "proper" bug.
(feel free though to comment again if issues persist)
@lichtwerk
Thank you for looking into it!
You might want to add a note to the the original Blenderman files so no more people stumble over it without a way to fix it :)
Added subscriber: @dfelinto
@dfelinto : can we consider just saving this file with the solidify modifier tweaked (see above for why this fails) and reupload?
@lichtwerk this is for the Blender Cloud team to decide. Having it tagged should be enough for them. Though may be better to create a new report only for the cloud (update asset, see known issue Txxx) instead.
Changed status from 'Archived' to: 'Confirmed'
I will just reuse this task here as the task for updating the asset on the cloud [will update the task description accordingly and upload the tweaked asset]
Bug/Regression Artifacts when rendering procedural Blenderman with Blender 2.8<to Artifacts when rendering procedural Blenderman with Blender 2.8< (needs updating the assset on Blender Cloud)Added subscriber: @MikeyN
Hey @lichtwerk are you able to provide an updated file?
I can add it to the cloud from there.
@MikeyN The first file in the task description should be the updated file.
@lichtwerk for the records. Blender cloud related issues have:
This is the default values when someone reports a bug from the [Blender cloud > contact > report bug ]]. The form that is used in these cases is [ https:*developer.blender.org/transactions/editengine/maniphest.task/view/15/ | this .
Changed status from 'Confirmed' to: 'Resolved'
File updated
@MikeyN : thx
@dfelinto : noted