Metaballs particles with drag force disapearing #78996

New Issue

Jean-Pascal GAIFFAS · 2020-07-16T17:19:40+02:00

2020-07-16 17:19:40 +02:00

System Information
Operating system: Linux-5.3.0-62-generic-x86_64-with-debian-buster-sid 64 Bits
Graphics card: GeForce RTX 2080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 440.33.01

Blender Version
Broken: version: 2.83.2, branch: master, commit date: 2020-07-09 05:50, hash: 239fbf7d93
Worked: Never (2.8+)

Short description of error
Hi Guys,

as you could see in the atachment file, the metaballs instances particles disapears on certains frames ...
There is no problem when Drag Force is not applied

Thanks in advance for your help !
Your Software is amazing !! We love it !

Exact steps for others to reproduce the error
MetaballsParticlesBug.blend

Open file
Play animation

**System Information** Operating system: Linux-5.3.0-62-generic-x86_64-with-debian-buster-sid 64 Bits Graphics card: GeForce RTX 2080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 440.33.01 **Blender Version** Broken: version: 2.83.2, branch: master, commit date: 2020-07-09 05:50, hash: `239fbf7d93` Worked: Never (2.8+) **Short description of error** Hi Guys, as you could see in the atachment file, the metaballs instances particles disapears on certains frames ... There is no problem when Drag Force is not applied Thanks in advance for your help ! Your Software is amazing !! We love it ! **Exact steps for others to reproduce the error** [MetaballsParticlesBug.blend](https://archive.blender.org/developer/F8699415/MetaballsParticlesBug.blend) - Open file - Play animation

Jean-Pascal GAIFFAS commented

2020-07-16 17:19:40 +02:00

Added subscriber: @jpgaiffas

blender-admin commented

2020-07-16 17:19:40 +02:00

#79413 was marked as duplicate of this issue

Richard Antalik commented

2020-07-17 03:25:48 +02:00

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

Richard Antalik commented

2020-07-17 03:28:26 +02:00

Added subscriber: @iss

Richard Antalik commented

2020-07-17 03:28:26 +02:00

Looks like drag field is making particlas go crazy. I have tried quite conservative settings and got more or less same result

Jacques Lucke commented

2020-07-30 18:15:56 +02:00

Added subscriber: @JacquesLucke

Jacques Lucke commented

2020-07-30 18:15:56 +02:00

This issue is driving me nuts ^^
I was not able to track down the root issue yet. What makes this hard to fix is that every individual operation seems to make sense. There is some kind of feedback loop that lets the values explodes over time. Maybe someone else has more luck debugging this.

This issue is driving me nuts ^^ I was not able to track down the root issue yet. What makes this hard to fix is that every individual operation seems to make sense. There is some kind of feedback loop that lets the values explodes over time. Maybe someone else has more luck debugging this.

Jacques Lucke commented

2020-07-30 18:19:57 +02:00

As a starting point you might want to apply P1559 and then open the provided .blend file. The printed information should show that the values explode over time.

As a starting point you might want to apply [P1559](https://archive.blender.org/developer/P1559.txt) and then open the provided .blend file. The printed information should show that the values explode over time.

Richard Antalik commented

2020-08-02 00:47:22 +02:00

Added subscriber: @mbutscher

Philipp Oeser removed the

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Metaballs particles with drag force disapearing #78996