Geometry nodes. Attribute mix work wrong way #84106
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Reference: blender/blender#84106
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System Information
Operating system: Windows-7-6.1.7601-SP1 64 Bits
Graphics card: GeForce GTX 660 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 456.71
Blender Version
Broken: version: 2.92.0 Alpha, branch: master, commit date: 2020-12-23 18:13, hash:
c9efb54240
Short description of error
Using Attribute Mix produces on Vertex Groups produces incorrect results.
Exact steps for others to reproduce the error
You should notice that at factor 1 the result does not match the input from Painted. The result looks equal at a factor of about 0.58.
mixbad.blend
As title says.
I am mixing two vertex groups with zeros and random values and Factor=1. So result should be equal to second group.
But it is not.
2020-12-24_13-17-04.mp4
Added subscriber: @Vyach
I suppose, randomize cause issues.
2020-12-24_13-24-09.mp4
Added subscriber: @rjg
I don't think this is a bug. If you randomize the attribute to values between 0 and 1 that was formerly all zero and then mix it with another attribute, the result will not be all zero anymore. Could you please explain what the expected result is with regards to the second video you've posted?
@rjg even without randomizer I have wrong result. I am mixing 0 and gradient and result is different from that gradient
mixbad.blend
2020-12-28_05-06-36.mp4
I expect, mix should work like this custom nodegroup
mixgood.blend
2020-12-28_05-12-41.mp4
I can't reproduce the problem with a build based on
960a0b892c
2020-12-27 14:55 on Linux. Could you please test this again with a current daily build? You seem to be using a different color gradient for display in weight painting (normally zero is blue), perhaps modified through an add-on? Does this also happen when you start Blender with factory defaults?@rjg 2020-12-28_15-39-55.mp4
Already tested. Same result.
My bad, I see the problem now. That is indeed strange, you get approximately equal results at about 0.58.
Changed status from 'Needs Triage' to: 'Confirmed'
This issue was referenced by
17be2149a8
Changed status from 'Confirmed' to: 'Resolved'