Smoke flow force field not working with Mantaflow Gas #74060
Labels
No Label
Interest
Alembic
Interest
Animation & Rigging
Interest
Asset Browser
Interest
Asset Browser Project Overview
Interest
Audio
Interest
Automated Testing
Interest
Blender Asset Bundle
Interest
BlendFile
Interest
Collada
Interest
Compatibility
Interest
Compositing
Interest
Core
Interest
Cycles
Interest
Dependency Graph
Interest
Development Management
Interest
EEVEE
Interest
EEVEE & Viewport
Interest
Freestyle
Interest
Geometry Nodes
Interest
Grease Pencil
Interest
ID Management
Interest
Images & Movies
Interest
Import Export
Interest
Line Art
Interest
Masking
Interest
Metal
Interest
Modeling
Interest
Modifiers
Interest
Motion Tracking
Interest
Nodes & Physics
Interest
OpenGL
Interest
Overlay
Interest
Overrides
Interest
Performance
Interest
Physics
Interest
Pipeline, Assets & IO
Interest
Platforms, Builds & Tests
Interest
Python API
Interest
Render & Cycles
Interest
Render Pipeline
Interest
Sculpt, Paint & Texture
Interest
Text Editor
Interest
Translations
Interest
Triaging
Interest
Undo
Interest
USD
Interest
User Interface
Interest
UV Editing
Interest
VFX & Video
Interest
Video Sequencer
Interest
Virtual Reality
Interest
Vulkan
Interest
Wayland
Interest
Workbench
Interest: X11
Legacy
Blender 2.8 Project
Legacy
Milestone 1: Basic, Local Asset Browser
Legacy
OpenGL Error
Meta
Good First Issue
Meta
Papercut
Meta
Retrospective
Meta
Security
Module
Animation & Rigging
Module
Core
Module
Development Management
Module
EEVEE & Viewport
Module
Grease Pencil
Module
Modeling
Module
Nodes & Physics
Module
Pipeline, Assets & IO
Module
Platforms, Builds & Tests
Module
Python API
Module
Render & Cycles
Module
Sculpt, Paint & Texture
Module
Triaging
Module
User Interface
Module
VFX & Video
Platform
FreeBSD
Platform
Linux
Platform
macOS
Platform
Windows
Priority
High
Priority
Low
Priority
Normal
Priority
Unbreak Now!
Status
Archived
Status
Confirmed
Status
Duplicate
Status
Needs Info from Developers
Status
Needs Information from User
Status
Needs Triage
Status
Resolved
Type
Bug
Type
Design
Type
Known Issue
Type
Patch
Type
Report
Type
To Do
No Milestone
No project
No Assignees
11 Participants
Notifications
Due Date
No due date set.
Dependencies
No dependencies set.
Reference: blender/blender#74060
Loading…
Reference in New Issue
No description provided.
Delete Branch "%!s(<nil>)"
Deleting a branch is permanent. Although the deleted branch may continue to exist for a short time before it actually gets removed, it CANNOT be undone in most cases. Continue?
System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 950M/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 442.19
Blender Version
Broken: version: 2.82 (sub 7), branch: master, commit date: 2020-02-12 16:20, hash:
77d23b0bd7Worked: (optional)
Short description of error
I'm making a smoke simulation with Blender 2.82 and I'm trying to guide a particle system with a smoke flow field (like this video: https://www.youtube.com/watch?v=iddFzef4H6E). Both normal velocity and gravity are in 0 but particles don't move at all. Should I change something else with the new simulation framework?
Exact steps for others to reproduce the error
Create a smoke simulation, create an object with a particle system with both normal velocity and gravity field weight with a value of 0, create a smoke flow force field with the smoke domain object of the smoke simulation
bug_gas _blender.zip
Added subscriber: @pierreee1
#76674 was marked as duplicate of this issue
#76321 was marked as duplicate of this issue
#75976 was marked as duplicate of this issue
Changed status from 'Needs Triage' to: 'Confirmed'
Added subscriber: @mano-wii
Changed status from 'Confirmed' to: 'Archived'
Did you try to change the Flow Source in the Flow settings?
https://docs.blender.org/manual/en/2.80/physics/smoke/types/flow_object.html#flow-source
This does not appear to be a bug.
For user support please use other channels:
https://www.blender.org/community/
Added subscriber: @iss
Changed status from 'Archived' to: 'Needs User Info'
Oops, confirmed wrong report.
I see some dependency cycle in the file, so it would be best to resolve that.
Also it is not evident what does not work in this report. Is it particle system or force field?
Changed status from 'Needs User Info' to: 'Archived'
Ok I will change this again...
If you can demonstrate bug with simple case that would be acceptable. it is hard to debug complex solutions like this one
@mano-wii I'm not sure I should change the flow source. I changed it to the particle system but it didn't work either. @iss What it not working is the particle system. Normally with a smoke flow force field the particles shoud follow the smoke direction but they don't.
Like this example: https://www.youtube.com/watch?v=Xkxvye9xA8o I woudn't know how to simplify the case
Did you delete the cache?
@pierreee1 sorry for misunderstanding I understand what problem is now
@mano-wii I have deleted the cache, and it works if you don't start from frame 1, but only once. Does playing simulation for second time work for you?
@mano-wii I didn't delete it bit I changed the cache's type to Replay and it works but with very strange results. @iss Using Modular type and deleting the cache also works once if I don't start from frame 1.
I was unable to replicate this problem here. (The baking works with the initial frame being 1, 2, 10 ...)
I’ll try making another sim from scratch. What steps did you take? Also, did you delete the whole cache folder?
Sill no luck @mano-wii @iss and I tried in a different machine: system-info.txt
With the Modular and Final type of cache the particles don't move, even if I make a change in the simulation domain settings and the smoke flow force field and re-bake the simulation nothing happens.
When I use the Replay type of cache the particles move but don't follow the smoke as they should.
smoke_flow.zip
Changed status from 'Archived' to: 'Confirmed'
I will re-open this, because I have still problems even when starting from scratch.
Added subscriber: @MichaelHermann
Added subscriber: @nede123
Can someone please answer this and stop complaining about it being vague? particles don't follow mantaflow smoke, pretty simple question and it's not working for me either - same tutorial
Report is confirmed so we need developer to go over this now. I apologize for delaying this, but please be patient.
Added subscriber: @aristotelis
This problem seems to be still around, tried the same with the other guys, same result. Particles don't follow the smoke..
Added subscriber: @kupiakos
@mano-wii If I'm understanding you, you've been able to get this working, correct? Would you be able to upload a sample blender file and instructions for reproduction? I've not been able to have Mantaflow smoke be affected by a particle force field, regardless of cache type or re-baking.
Added subscribers: @EvertonSchneider, @brecht
I also reported this bug, merged here, didn't know about this report... sorry. I just want to tell my experience with this "inconsistency" in the smoke flow force field.
1 - While baking the smoke sim with replay cache mode the smoke flow force field seems to work ok(but I still find something strange... it's hard to set up and make it work well but this is another thing separated from the problem from this report...)
2 - After the smoke sim is cached and you change some of the settings from the smoke flow force field the inconsistency is apparent, the particles become totally different and even when you set the values back to where they are before the result from case 1 never came back... you need to clear the smoke cache and simulate again...
SmokeFlow_Inconsistency.blend
I also started a discussion about "exposing"(I'm not dev and don't know if it's a simple "expose" case) more properties from gas sim to be used by the smoke flow force field.
You can check it here:
https://devtalk.blender.org/t/update-smoke-flow-force-field/12761
Well I found a very handy feature while investigating this bug and it's the viewport display setting inside mantaflow domain. The Debug Velocity option reveals that the velocity is calculated while the simulation runs but this information seems to be "released" or "cleaned" after the the smoke frames are baked.
While baking (Replay Mode)
After bake (Replay Mode)
Is there a way to store the velocity info with the cache?
Added subscriber: @sebbas
Nice observation! This is indeed weird, because the velocity is also stored in the cache folder (if you see the cached data on the computer, there are velocity frames saved). Also in the shading process, the velocity data are not there either. Maybe @sebbas can explain us why this is happening? Could be to make the bakes lighter?
Added subscribers: @Stanislav-Shelestov, @ankitm
Any news on this report? Is Someone checking here?
@EvertonSchneider That's a good point - the velocities are currently not loaded when reading the cache. I probably omitted them for optimization purposes. Will fix that!
Added subscriber: @YuraKharitonow
@sebbas Do you think that it is possible to keep the velocity data in the cache(I don't know exactly how it works so ignore my guessing)?
Also, what do you think that is causing the strange behavior with the smoke flow force field over particles? Do you know how to bring a similar behavior as before(old smoke system) or even better as discussed here ?
Or the smoke force field behavior is a separate issue here?
This issue was referenced by
fe257cc384Changed status from 'Confirmed' to: 'Resolved'
This is awesome! I can't express how nice is this... to be able to follow a bug begin smashed! Everything is working so nice now! Thank you all!!! Special thanks to @sebbas ! You're doing an awesome job! Thanks!
AdvectionAgain.mp4