(DP) Paint not following object, when object constraint to dp weight created vertex group #71166
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Reference: blender/blender#71166
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System Information
Operating system: Windows-10-10.0.18362 64 Bits
Graphics card: GeForce GTX 970/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 388.13
Blender Version
Broken: version: 2.81 (sub 16), branch: master, commit date: 2019-10-27 13:40, hash:
9b6aa740be
also broken in 2.80 release
Worked: (optional)
Short description of error
I want to control the location of an object by drawing weight paint on a plane and constraint the object to this vertex group created by the weight paint. The problem occurs when the object with the constraint should also be a brush painting colors on the plane. The colour will not follow the object, but stay at the objects "original origin".
examples
2.81: https://www.dropbox.com/s/cougeh7xhujnvp2/DynPaint_2-81.blend?dl=0
[2.80 https://www.dropbox.com/s/n9tbxbeo0hh6hpe/DynPaint_2-80.blend?dl=0]
Exact steps for others to reproduce the error
#71166.blend
from scratch:
collections:
plane (master or other collection):
Add a cylinder (will mark the spot for the cube to be via dp weight on the plane)
Cube
If you would constrain the cube to the location of the cylinder, the cube will brush paint as expected.
I hope you can reproduce and find the problem. ... At one point of setting up this exact example for you I added keyframes to the cube and it painted correctly .... I tested that because of another bug in the same setup, where the cube is not following the cylinder when it has location keyframes (minimum of two)...as if the keyframes overwrite the constraint. However, in the minimal setup I can't reproduce it. So if you have an idea connected to it to it go for it... I'll try to find a setup that makes clear where the problem comes from
thanks for your work.
Added subscriber: @BjornEckhardt
Added subscriber: @iss
Changed status from 'Needs Triage' to: 'Needs User Info'
Can you upload sample .blend file that we can investigate?
thx for looking into the issue.
Here is the link to the example file.
https://www.dropbox.com/s/cougeh7xhujnvp2/DynPaint_2-81.blend?dl=0
This technique is used in my Addon "Advanced Ocean Modifier" where you can get the descriped path quickly with a few clicks. Be welcome to use it for your investigation (or fun):
https://www.dropbox.com/s/6ki5mhe6vy8p8lc/AOM_2-80_V6.zip?dl=0
in the n-panel of 3D Viewport, Advanced Ocean tab, press "generate ocean". then choose an mesh object (e.g. standard cube) and press float object(s). It does what what is described above + Oceananimation, Ocean material...
don't hesitate to ask if you need more information
regards Björn
Changed status from 'Needs User Info' to: 'Confirmed'
I can confirm the issue.
When I
Cube now follows cylinder and also draws on plane
Added subscriber: @mont29
Changed status from 'Confirmed' to: 'Archived'
Thanks for the report, but no bug here, this set-up is not expected to work, as position of the cube depends on the results of the dynamic paint evaluation, it cannot be used for it… Depsgraph does infor you about those dependency cycles: