Dynamic Paint sub-steps doesn't work with particles #85523

New Issue

Luka Glisic · 2021-02-10T17:11:40+01:00

Luka Glisic commented

2021-02-10 17:11:40 +01:00

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 1070 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 457.51

Blender Version
Broken: version: 2.93.0 Alpha, branch: master, commit date: 2021-02-08 23:42, hash: eab9165c25

Short description of error
When using a particle system as a dynamic paint brush, the sub-steps setting of the canvas doesn't work. The sub-steps appear to work as intended with all other brush types. Whether the painting is done with vertex or texture maps doesn't seem to have an impact on the bug.

Exact steps for others to reproduce the error

Open attached .blend
Bake the dynamic paint cache with a sub-steps value > 0
The result shows no sub-steps
Bug2.blend

**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: GeForce GTX 1070 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 457.51 **Blender Version** Broken: version: 2.93.0 Alpha, branch: master, commit date: 2021-02-08 23:42, hash: `eab9165c25` **Short description of error** When using a particle system as a dynamic paint brush, the sub-steps setting of the canvas doesn't work. The sub-steps appear to work as intended with all other brush types. Whether the painting is done with vertex or texture maps doesn't seem to have an impact on the bug. **Exact steps for others to reproduce the error** * Open attached .blend * Bake the dynamic paint cache with a sub-steps value > 0 * The result shows no sub-steps [Bug2.blend](https://archive.blender.org/developer/F9770884/Bug2.blend)

Luka Glisic commented

2021-02-10 17:11:40 +01:00

Added subscriber: @LG787

blender-admin commented

2021-02-10 17:11:40 +01:00

#87275 was marked as duplicate of this issue

Philipp Oeser commented

2021-02-10 18:52:10 +01:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2021-02-10 18:52:10 +01:00

Changed status from 'Needs Triage' to: 'Confirmed'

Philipp Oeser commented

2021-02-10 18:52:10 +01:00

Looks like this is just not implemented, BKE_object_modifier_update_subframe is doing nothing special for particle systems.

So this might not be a bug in the end maybe a Known Issue?
Will confirm for now though.

Looks like this is just not implemented, `BKE_object_modifier_update_subframe` is doing nothing special for particle systems. So this might not be a bug in the end maybe a Known Issue? Will confirm for now though.

Philipp Oeser commented

2021-07-21 14:53:48 +02:00

Added subscribers: @gogo, @PratikPB2123

Philipp Oeser commented

2021-07-21 14:54:48 +02:00

dropping notes from #87275:

In #87275#1142672, @lichtwerk wrote:
In code, it looks like only the brush objects (so Source being anything but Particle System) are updated specifically for each subframe.
Afaict, their particle data is not available in subframes for dynamic paint to use though.

It would be nice to somehow have that data available [maybe in conjunction with specifying a higher value for Physics > Integration > Subframes on the particle system], but this would be more like a feature request (which is not handled in this bugtracker).

I am not 100% sure though if this is by design, so will have the module devs have a confirming look...

In #87275#1142705, @gogo wrote:
It was working in 2.97 so i don't consider it a feature request; maybe it's a degradation?

dropping notes from #87275: > In #87275#1142672, @lichtwerk wrote: > In code, it looks like only the brush **objects** (so `Source` being anything **but** `Particle System`) are updated specifically for each subframe. > Afaict, their particle data is not available in subframes for dynamic paint to use though. > > It would be nice to somehow have that data available [maybe in conjunction with specifying a higher value for `Physics` > `Integration` > `Subframes` on the particle system], but this would be more like a feature request (which is not handled in this bugtracker). > > I am not 100% sure though if this is by design, so will have the module devs have a confirming look... > In #87275#1142705, @gogo wrote: > It was working in 2.97 so i don't consider it a feature request; maybe it's a degradation?

Dalai Felinto commented

2022-05-09 15:17:51 +02:00

Added subscriber: @dfelinto

Dalai Felinto commented

2022-05-09 15:17:51 +02:00

Thanks for the report. Marking this as known issue since it depends on the old particle settings which is end of life .

Thanks for the report. Marking this as known issue since it depends on the [old particle settings which is end of life ](https://developer.blender.org/tag/nodes_physics/).

Philipp Oeser removed the

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Dynamic Paint sub-steps doesn't work with particles #85523