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Blender 2.6 Bug Tracker: Browse
[#19706] Smoke 'sticks' to Collision objects initial position
Date:
2009-10-21 23:49
Priority:
3
State:
Closed
Submitted by:
Eric Pranausk (
cire
)
Assigned to:
Janne Karhu (jhk)
Category:
Physics
Status:
Fixed / Closed
Relates to:
Duplicates:
Patches:
Summary:
Smoke 'sticks' to Collision objects initial position
Detailed description
OS version: Ubuntu 9.04 64-bit
3D card type: GeForce GTX285
Blender version: 2.50 r24032
When a Smoke sim's particle source comes into contact with a Smoke Collision object, it seems as if the particles are left behind, sticking to the objects surface at that frame, where they continue to emit smoke throughout the rest of the simulation.
Setup steps taken are the basic ones for creating a simulation.
The attached file contains 1 Domain object, 1 Flow object and 2 possible Collision objects.
Running the sim as is (resolution 32, 'cave' object as only Collision object) results in this behavior when the 'torch' comes close to the ground at about frame 130.
Running the sim at resolution 64 (allowing the flow to escape the 'cage' of the torch), with the torch object as the only Collision object results in this behavior as the torch leaves it's starting location at about frame 80.
Followup
Message
Date
: 2009-10-22 01:39
Sender
:
Eric Pranausk
Just to clarify this statement: "as if the particles are
left behind"
It's actually 'as if SOME particles are left behind' ... those that make contact.
BTW: this behavior is dependent on smoke resolution - setting the divisions to 64 prevents the first scenario, as the smoke is now 'finer' and does not touch the cave collision object (so it appears not to be directly particle-related, but SmokeSim itself).
Date
: 2009-11-05 20:32
Sender
:
Tom Musgrove
assigning to Daniel the smoke creator
Date
: 2010-01-25 23:49
Sender
:
Brecht Van Lommel
Confirmed the bug, there is some smoke staying behind at the bottom, clearly visible from about frame 200. Though could be a resolution issue that is not a bug, at low resolutions it may not be able to detect the collision properly somehow.
Date
: 2010-11-20 17:13
Sender
:
Ton Roosendaal
Assigning to Janne, Daniel has no time...
Date
: 2010-11-23 15:40
Sender
:
Janne Karhu
The collision objects were only updated after the smoke was emitted, so smoke was being emitted inside collision cells and it got stuck there. Fix committed, thanks for the report!
Attached Files:
Name
Date
Download
SmokeSim_Bug.blend
2009-10-21 23:49
Download
Changes:
Field
Old Value
Date
By
Resolution
Approved
2010-11-23 15:40
jhk
close_date
2010-11-23 15:40
2010-11-23 15:40
jhk
status_id
Open
2010-11-23 15:40
jhk
assigned_to
genscher
2010-11-20 17:13
ton
Resolution
None
2010-01-25 23:49
blendix
assigned_to
none
2009-11-05 20:32
letterrip
File Added
8877: SmokeSim_Bug.blend
2009-10-21 23:49
cire
