Mantaflow: Cache not invalidated when moving domain #76911

New Issue

Andrea Coppola · 2020-05-20T14:58:03+02:00

Andrea Coppola commented

2020-05-20 14:58:03 +02:00

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce RTX 2080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 445.87

Blender Version
Broken: version: 2.83 (sub 17), branch: master, commit date: 2020-05-19 23:15, hash: dfe8195dfe
Worked: (newest version of Blender that worked as expected)

Short description of error
Hi, In Blender 2.83 beta, can't bake the "Fluid" simulations. So, when I create a new domain, scaling it, the smoke stay in the original position. The same problem appears when I use Liquid similation. Scaling or moving Domain the particles scale and move but don't consider the original position of the flow object. Can't adjust it without bake? How to solve it? How to restart the simulation considering the new Domain dimension and position?

Exact steps for others to reproduce the error

Create a liquid domain and an inflow object within it. Ensure the cache type is set to Replay.
Set the domain to show as wireframe in the viewport so you can see the particles within it.
Play 20-30 frames and observe particles behaving properly.
Move the domain down on the Z axis while keeping the inflow object within it.

Rewind to frame 1 and play again. Note that the fluid positions are still cached and calculated relative to the original domain position.

The only way to fix it is to set cache type to Final, start baking, then free all data, then go back to Replay cache type.

**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: GeForce RTX 2080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 445.87 **Blender Version** Broken: version: 2.83 (sub 17), branch: master, commit date: 2020-05-19 23:15, hash: `dfe8195dfe` Worked: (newest version of Blender that worked as expected) **Short description of error** Hi, In Blender 2.83 beta, can't bake the "Fluid" simulations. So, when I create a new domain, scaling it, the smoke stay in the original position. The same problem appears when I use Liquid similation. Scaling or moving Domain the particles scale and move but don't consider the original position of the flow object. Can't adjust it without bake? How to solve it? How to restart the simulation considering the new Domain dimension and position? ![liquid.JPG](https://archive.blender.org/developer/F8544798/liquid.JPG) ![smoke 283.JPG](https://archive.blender.org/developer/F8544794/smoke_283.JPG) **Exact steps for others to reproduce the error** - Create a liquid domain and an inflow object within it. Ensure the cache type is set to Replay. - Set the domain to show as wireframe in the viewport so you can see the particles within it. - Play 20-30 frames and observe particles behaving properly. - Move the domain down on the Z axis while keeping the inflow object within it. # Rewind to frame 1 and play again. Note that the fluid positions are still cached and calculated relative to the original domain position. The only way to fix it is to set cache type to Final, start baking, then free all data, then go back to Replay cache type.

Andrea Coppola commented

2020-05-20 14:58:03 +02:00

Added subscriber: @blenderhighschool

Andrea Coppola commented

2020-05-20 14:58:32 +02:00

![smoke 283.JPG](https://archive.blender.org/developer/F8544802/smoke_283.JPG)

Andrea Coppola commented

2020-05-20 15:53:43 +02:00

I wondered that, deleting the cache in the panel in Blender, the problem is solved and the particles or the smoke start correctly around the Flow object.
So, I think that this is non a friendly method.
It's OK to remove the Bake buttons and the real time simulations, but maybe you can add a "RESET CACHE" button?
Thanx!
Andrea

I wondered that, deleting the cache in the panel in Blender, the problem is solved and the particles or the smoke start correctly around the Flow object. So, I think that this is non a friendly method. It's OK to remove the Bake buttons and the real time simulations, but maybe you can add a "RESET CACHE" button? Thanx! Andrea

Germano Cavalcante commented

2020-05-21 23:21:07 +02:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2020-05-21 23:21:07 +02:00

Changed status from 'Needs Triage' to: 'Needs User Info'

Germano Cavalcante commented

2020-05-21 23:21:07 +02:00

I don't understand the problem.
Could you provide a simple .blend file and describe the steps to reproduce the problem?

guideline for making bug reports: https://wiki.blender.org/wiki/Process/Bug_Reports

I don't understand the problem. Could you provide a simple .blend file and describe the steps to reproduce the problem? guideline for making bug reports: https://wiki.blender.org/wiki/Process/Bug_Reports

Nikhil Shringarpurey commented

2020-05-22 17:25:49 +02:00

Added subscriber: @Nikhil.Net

Nikhil Shringarpurey commented

2020-05-22 17:25:49 +02:00

I can attach a blend file but I see what he is saying, and it is not related to Gas domains only - it also affects liquid domains. Here's what happens and I can replicate it 100% on 2.83 as of current build:

Create a liquid domain and an inflow object within it. Ensure the cache type is set to Replay.
Set the domain to show as wireframe in the viewport so you can see the particles within it.
Play 20-30 frames and observe particles behaving properly.
Move the domain down on the Z axis while keeping the inflow object within it.
Rewind to frame 1 and play again. Note that the fluid positions are still cached and calculated relative to the original domain position.
The only way to fix it is to set cache type to Final, start baking, then free all data, then go back to Replay cache type.

Some button or option to clear the replay cache is what OP is asking for, and I think that's a reasonable request. Or, the replay cache should reset at the start of playback at frame 1 if changes to the domain transform have occurred.

Currently, fiddling with domain settings and changing them back does force a cache reset, but that's not a clean way to handle this use case.

I can attach a blend file but I see what he is saying, and it is not related to Gas domains only - it also affects liquid domains. Here's what happens and I can replicate it 100% on 2.83 as of current build: - Create a liquid domain and an inflow object within it. Ensure the cache type is set to Replay. - Set the domain to show as wireframe in the viewport so you can see the particles within it. - Play 20-30 frames and observe particles behaving properly. - Move the domain down on the Z axis while keeping the inflow object within it. - Rewind to frame 1 and play again. Note that the fluid positions are still cached and calculated relative to the original domain position. - **The only way to fix it is to set cache type to Final, start baking, then free all data, then go back to Replay cache type**. Some button or option to clear the replay cache is what OP is asking for, and I think that's a reasonable request. Or, the replay cache should reset at the start of playback at frame 1 if changes to the domain transform have occurred. Currently, fiddling with domain settings and changing them back does force a cache reset, but that's not a clean way to handle this use case.

Andrea Coppola commented

2020-05-22 20:07:57 +02:00

Correct Nikhil.
I think that includIng into the final version 2.83 a reset button for the chache or force anyway the chache to reset automatically when restart the animation is a very reasonable solution.
Waiting.
Thank you

Correct Nikhil. I think that includIng into the final version 2.83 a reset button for the chache or force anyway the chache to reset automatically when restart the animation is a very reasonable solution. Waiting. Thank you

Germano Cavalcante commented

2020-05-22 20:23:30 +02:00

Changed status from 'Needs User Info' to: 'Needs Triage'

Nikhil Shringarpurey commented

2020-05-22 20:55:14 +02:00

Added subscriber: @sebbas

Nikhil Shringarpurey commented

2020-05-22 20:55:14 +02:00

I wanted to tag @sebbas so he saw this, as he is one of the super-smart physics brains here! 😀

Sebastián,

Take a quick look at my comment above with steps to reproduce and I think you'll see right away what we are talking about.

I wanted to tag @sebbas so he saw this, as he is one of the super-smart physics brains here! 😀 Sebastián, Take a quick look at my comment above with steps to reproduce and I think you'll see right away what we are talking about.

Richard Antalik changed title from ~~Can't adjust the smoke simulation scaling domain in blender 2.83 beta~~ to Mantaflow: Cache not invalidated when moving domain

2020-05-25 11:46:44 +02:00

Richard Antalik commented

2020-05-25 11:46:44 +02:00

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

Germano Cavalcante commented

2020-05-25 15:59:53 +02:00

Closed as duplicate of #76095

Germano Cavalcante closed this issue

2020-05-25 15:59:53 +02:00

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Mantaflow: Cache not invalidated when moving domain #76911

Rewind to frame 1 and play again. Note that the fluid positions are still cached and calculated relative to the original domain position.