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Dynamic Paint weight group isn't updated unless weight has been assigned
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Description

System Information
Operating system: Windows-10-10.0.17763 64 Bits
Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 388.13

Blender Version
Broken: version: 2.80 (sub 74), branch: master, commit date: 2019-07-11 13:50, hash: rB06312c6d2db8
Worked: (optional)

Short description of error
if you worked in dynamic paint, and used weight mode, you will feel bothered, nothing will show in viewport. in 2.79x, you can preview the weight color, and easy used in modifier.

Exact steps for others to reproduce the error

Just download my .blend file, and play animation with space bar.

[Please describe the exact steps needed to reproduce the issue]
[Based on the default startup or an attached .blend file (as simple as possible)]

Event Timeline

just test it just for curiosity, its not only a visualization issue, it doesn't seems to be working at all.
I just added a displace to the plane and masked it with the group, works in 2.79, i also try baking the vertex group, didn't work in 2.8

@Nahuel Belich (belich) I can't determine the running situation because I can't see it. I add the mask modifier, looks good, but displace modifier seems not work.

Sebastian Parborg (zeddb) lowered the priority of this task from 90 to 30.Jul 15 2019, 12:28 PM

The viewport display is a known limitation.

I can't reproduce the display modifier not working though. So you guys will have to be a bit more descriptive:

This issue is that the 'dp_weight' vertex group isn't working as expected in the modifier stack for most modifiers that take a vertex group input... I've found that if you assign a single vertex to the 'dp_weight' group it seems to initialize the group and everything works... you can even remove the vertex from the group and everything still works as expected...

version: 2.80 (sub 74), branch: master, commit date: 2019-07-11 13:50, hash: rB06312c6d2db8

Sebastian Parborg (zeddb) raised the priority of this task from 30 to 50.
Sebastian Parborg (zeddb) renamed this task from Don't show weight group when used Dynamic Paint [2.8] to Dynamic Paint weight group isn't updated unless weight has been assigned.Jul 15 2019, 5:37 PM

I've posed a potential fix: D5263


@Sebastian Parborg (zeddb) In my video, you can see, the dynamic is worked with mask and wireframe modifier, but nothing with displace modifier, it's Strangely.