Elastic Deform brush becomes extremely slow when Dyntopo is active #76725
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Reference: blender/blender#76725
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System Information
Operating system: Windows 10 Pro 64-bit
Graphics card: NVIDIA GeForce RTX 2080 Ti
Blender Version
Broken: Blender 2.90 Alpha,
f9d0f59bed
Worked: ?
Short description of error
I don't know if this can be considered to be a bug / error, but it is inconsistent and inconvenient behaviour:
Using the Elastic Deform brush while Dyntopo is active makes the effect agonizingly slow.
This results in constantly having to Control + D before and after activating Elastic Deform, while this isn't necessary when using the Grab brush. Dyntopo is automatically inactive when using Grab, but you don't need to deactivate Dyntopo.
If this could be fixed, that would make me a happy camper again. Thanks in advance.
Exact steps for others to reproduce the error
Add three levels of subdivision to a Suzanne mesh and apply the modifier.
Enter Sculpt Mode
Activate Dyntopo (I'm using Constant Detail), and increase the Dyntopo resolution to 30 or more.
Use the Elastic Deform brush. It will be very slow.
Switch off Dyntopo and use the Elastic Deform brush again. It will work smoothly.
Added subscriber: @MetinSeven-1
#94866 was marked as duplicate of this issue
Added subscriber: @PabloDobarro
Elastic Deform needs to affect all nodes in the sculpt to produce its effect. In dyntopo nodes are small (100 primitives per node), so it adds extra overhead to these kind of brushes, which adds to the not great performance of dyntopo in general.
Thanks for the explanation, Pablo, appreciated. Is there maybe a workaround possible with a check that temporarily auto-deactivates Dyntopo when Elastic Deform is active?
Changed status from 'Needs Triage' to: 'Confirmed'
Added subscriber: @Vyach
Agree, it is better to have one freeze, when you select deformation tools, than to have extremely slow tools with dyntopo. OFC if there is no better solution.
Added subscriber: @Garek