Smoke strange behaviour (when scaling 'collision' type objects) #47551

New Issue

Deny Soares Trevisan · 2016-02-24T15:08:43+01:00

2016-02-24 15:08:43 +01:00

System Information

iMac
NVIDIA GeForce GT 755M 1024 MB

Blender Version

Broken:
I think the version is irrelevant in this case, as I tried it in various recent versions, and the problem is consistent.

Description of error

Smoke simulation starts to behave very strangely when I try to scale the 'collision' type object.
I've capture this video showing exactly what I'm talking:
some_bug.mov

Sorry if I'm using this channel the wrong way, but I really tried to find the answer to this problem before, and it seems nobody else have faced it. Maybe I'm missing something, but I don't know what. So, if it helps, here is also the .blend file with the simple setup you can see in the video:
smoke_bug.blend

Thanks for your attention!

**System Information** iMac NVIDIA GeForce GT 755M 1024 MB **Blender Version** Broken: I think the version is irrelevant in this case, as I tried it in various recent versions, and the problem is consistent. **Description of error** Smoke simulation starts to behave very strangely when I try to scale the 'collision' type object. I've capture this video showing exactly what I'm talking: [some_bug.mov ](https://dl.dropboxusercontent.com/u/36964210/smoke_bug.mov) Sorry if I'm using this channel the wrong way, but I really tried to find the answer to this problem before, and it seems nobody else have faced it. Maybe I'm missing something, but I don't know what. So, if it helps, here is also the .blend file with the simple setup you can see in the video: [smoke_bug.blend ](https://dl.dropboxusercontent.com/u/36964210/smoke_bug.blend) Thanks for your attention!

Deny Soares Trevisan commented

2016-02-24 15:08:43 +01:00

Changed status to: 'Open'

Deny Soares Trevisan commented

2016-02-24 15:08:43 +01:00

Added subscriber: @denyslave-1

Wolfgang Faehnle commented

2016-02-25 16:06:16 +01:00

Added subscriber: @mib2berlin

Wolfgang Faehnle commented

2016-02-25 16:06:16 +01:00

Hi, this is not a but, Blender try to recalculate smoke during scaling/moving thats because you get artifacts in 3Dview.
After finish scaling/moving all work as expected again.

Cheers, mib

Hi, this is not a but, Blender try to recalculate smoke during scaling/moving thats because you get artifacts in 3Dview. After finish scaling/moving all work as expected again. Cheers, mib

Dennis Fassbaender commented

2016-02-27 11:54:38 +01:00

Added subscriber: @DennisFassbaender

Dennis Fassbaender commented

2016-02-27 11:54:38 +01:00

I think its a bug, too.
If you rotate any smoke-collision-object around its z-axis, the same thing happens.
Thats often a problem when you want to use RB´s as colliders in a smokesim.

I think its a bug, too. If you rotate any smoke-collision-object around its z-axis, the same thing happens. Thats often a problem when you want to use RB´s as colliders in a smokesim.

Peter Boos commented

2016-02-27 13:57:51 +01:00

Added subscriber: @PeterBoos

Peter Boos commented

2016-02-27 13:57:51 +01:00

the smoke sim doesnt handle scaling, all object scales should be applied.
not sure if it is a bug, its always been that way.
Think of smoke as an advanced cycles material.
if one scales the domain, then also the smoke doesnt change, as a material it only stretches.

the smoke sim doesnt handle scaling, all object scales should be applied. not sure if it is a bug, its always been that way. Think of smoke as an advanced cycles material. if one scales the domain, then also the smoke doesnt change, as a material it only stretches.

Dennis Fassbaender commented

2016-02-27 14:30:05 +01:00

But rotating around any axis should not be a problem. Limiting a smoke-collider-animation just to movements without rotation is no deal.
Using rigidbody-smoke-colliders is actualy a problem- when there is the too much rotation the smoke puff´s like in Deny´s Video.
Ill attach a video: https://www.dropbox.com/s/k7da62vhc2omp8d/SmokeBugs.mp4?dl=0

But rotating around any axis should not be a problem. Limiting a smoke-collider-animation just to movements without rotation is no deal. Using rigidbody-smoke-colliders is actualy a problem- when there is the too much rotation the smoke puff´s like in Deny´s Video. Ill attach a video: https://www.dropbox.com/s/k7da62vhc2omp8d/SmokeBugs.mp4?dl=0

Kévin Dietrich commented

2016-02-28 01:40:56 +01:00

Added subscriber: @kevindietrich

Kévin Dietrich commented

2016-02-28 01:40:56 +01:00

Not sure where this instability comes from (clearly something fishy is happening in the velocity field), but this was already submitted and archived since no active developer is working in that area.

Kévin Dietrich commented

2016-02-28 01:41:13 +01:00

Closed as duplicate of #43220

Kévin Dietrich closed this issue

2016-02-28 01:41:13 +01:00

blender-admin commented

2016-07-18 18:03:05 +02:00

This issue was referenced by f593333099

This issue was referenced by f5933330998dc6c1aff9dc9fca32469717bf4dc3

Alexander Gavrilov commented

2016-08-02 19:18:05 +02:00

Changed status from 'Duplicate' to: 'Resolved'

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Smoke strange behaviour (when scaling 'collision' type objects) #47551