Regression: Metaballs have jagged normals in 3.4 #103021
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Reference: blender/blender#103021
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System Information
Operating system: macOS-12.5.1-arm64-arm-64bit 64 Bits
Graphics card: Apple M1 Max Apple 4.1 Metal - 76.3
Blender Version
Broken: version: 3.4.0, branch: blender-v3.4-release, commit date: 2022-12-06 18:46, hash:
a95bf1ac01Worked: (3.3)
Caused by:
eaa87101cdShort description of error
Metaballs have jagged edges on refractions in Cycles.
Exact steps for others to reproduce the error
Use Glass BSDF in Cycles. In the example you can see Icosphere on the left and Metaball on the right side.
Metaballs 3.4.blend
Added subscriber: @Daunt
Added subscriber: @OmarEmaraDev
Changed status from 'Needs Triage' to: 'Confirmed'
Bisecting.
Metaballs / Jagged Refractionsto Regression: Metaballs have jagged refractions in 3.4Added subscriber: @mod_moder
Added subscriber: @HooglyBoogly
Caused by
eaa87101cd.Regression: Metaballs have jagged refractions in 3.4to Regression: Metaballs have jagged normals in 3.4Added subscriber: @TheRedWaxPolice
I'm not quite sure about what to do about this. The normals are retrieved directly from the metaball tessellation algorithm, so theoretically they're correct.
Maybe it's the way they're interpolated that has changed. Either way, since I don't have an immediate solution, I'll un-claim this for now.
The normals do seem fine when the resolution is lower anyway.
I looked into this again today and I'm still not sure what's causing the change. The normals themselves are only ever calculated by the metaball tessellation algorithm in this file, so theoretically they should be correct. However, I made a small test file to show that they aren't actually-- the normals for the sphere don't line up correctly with its center (which I assume is the goal?).
Anyway, the next thing I'll try is looking through
eaa87101cdagain to try to spot any problems with the code.This is still scheduled for 3.5 and we are one week away from Bcon4. Any updates here?
This is true for all shaders (Principled BSDF too), it seems.