Dynamic Paint Substeps don't work #87275

Closed
opened 2021-04-07 21:38:47 +02:00 by Georg Bernhard · 11 comments

System Information
Operating system: MacOS Big Sur 11.2.2
Graphics card: Intel Iris Plus Graphics 1536 MB

Blender Version
Broken: 2.92.0 (release)
Worked: ?

When I use substeps for Dynamic Paint it doesn't make a difference in the images generated.

Exact steps for others to reproduce the error
Add particle system to default cube
Turn the cube into a Dynamic Paint Brush, set Source to Particle System, Particle System to "ParticleSettings"
Add in a plane and scale it by 4
Turn the plane into a Dynamic Paint Canvas, set Format it to image
Set Sub-Steps to 20 (maximum)
(Optional: Set Plane cache path to something reasonable you would find later)
Click "Bake Image Sequence"
(Optional: Set Sub-Steps to 0 (minimum)
(Optional: Set Plane cache path to something different than before)
(Optional: Click "Bake Image Sequence")
(Optional: Compare baked images)

If you compare 0 Sub-Steps to 20 Sub-Steps they look the same; I think Sub-Steps has no influence on the result whatsoever.

Based on the default startup or an attached .blend file (as simple as possible). bug_dynamic_paint_substeps.blend

**System Information** Operating system: MacOS Big Sur 11.2.2 Graphics card: Intel Iris Plus Graphics 1536 MB **Blender Version** Broken: 2.92.0 (release) Worked: ? When I use substeps for Dynamic Paint it doesn't make a difference in the images generated. **Exact steps for others to reproduce the error** Add particle system to default cube Turn the cube into a Dynamic Paint Brush, set Source to Particle System, Particle System to "ParticleSettings" Add in a plane and scale it by 4 Turn the plane into a Dynamic Paint Canvas, set Format it to image Set Sub-Steps to 20 (maximum) (Optional: Set Plane cache path to something reasonable you would find later) Click "Bake Image Sequence" (Optional: Set Sub-Steps to 0 (minimum) (Optional: Set Plane cache path to something different than before) (Optional: Click "Bake Image Sequence") (Optional: Compare baked images) If you compare 0 Sub-Steps to 20 Sub-Steps they look the same; I think Sub-Steps has no influence on the result whatsoever. Based on the default startup or an attached .blend file (as simple as possible). [bug_dynamic_paint_substeps.blend](https://archive.blender.org/developer/F9923215/bug_dynamic_paint_substeps.blend)
Author

Added subscriber: @gogo

Added subscriber: @gogo
Member

Added subscriber: @lichtwerk

Added subscriber: @lichtwerk
Member

Changed status from 'Needs Triage' to: 'Needs Developer To Reproduce'

Changed status from 'Needs Triage' to: 'Needs Developer To Reproduce'
Member

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 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...
Author

It was working in 2.97 so i don't consider it a feature request; maybe it's a degradation?

It was working in 2.97 so i don't consider it a feature request; maybe it's a degradation?
Member

Changed status from 'Needs Developer To Reproduce' to: 'Needs Triage'

Changed status from 'Needs Developer To Reproduce' to: 'Needs Triage'
Member

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?

Thx getting back, will double-check then.

> 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? Thx getting back, will double-check then.
Member

Added subscriber: @PratikPB2123

Added subscriber: @PratikPB2123
Member

will double-check then.

@lichtwerk , possibly the report is similar to #85523 (Dynamic Paint sub-steps doesn't work with particles)

> will double-check then. @lichtwerk , possibly the report is similar to #85523 (Dynamic Paint sub-steps doesn't work with particles)
Member

In #87275#1194025, @PratikPB2123 wrote:

will double-check then.

@lichtwerk , possibly the report is similar to #85523 (Dynamic Paint sub-steps doesn't work with particles)

Yes, indeed, thx catching that, will merge these reports

> In #87275#1194025, @PratikPB2123 wrote: >> will double-check then. > @lichtwerk , possibly the report is similar to #85523 (Dynamic Paint sub-steps doesn't work with particles) Yes, indeed, thx catching that, will merge these reports
Member

Closed as duplicate of #85523

Closed as duplicate of #85523
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Reference: blender/blender#87275
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