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Description

Physics simulation systems including rigid bodies, cloth, softbodies, smoke fluids and particles.

Developers

Bullet: @Erwin Coumans (erwin)
Rigid Body: @Sergej Reich (sergof)
Cloth: @Daniel Genrich (genscher)
Smoke: @Miika Hamalainen (miikah) @Daniel Genrich (genscher)
Fluids: @Daniel Genrich (genscher) @Nils Thuerey (n_t)
Particles: @Janne Karhu (jhk) @Lukas Toenne (lukastoenne)
Softbody: @Jens Ole Wund(bjornmose) (bjornmose)

Recent Activity

Fri, Oct 11

Mark Spink (marks) added a comment to T70175: Mantaflow not using subframes for particle emitters in Gas sim.

There you go-

Fri, Oct 11, 6:48 PM · Physics
Sebastián Barschkis (sebbas) added a comment to T70175: Mantaflow not using subframes for particle emitters in Gas sim.

The comparison of the mesh / particle looks very interesting. Can you send me that file?

Fri, Oct 11, 2:20 PM · Physics
Rombout Versluijs (rombout) added a comment to T53083: Bake All Dynamics doesn't work when baking particle hair.

Bake all in general doesnt do anything. It my last test, also cloth or other items wont start baking when using "Bake all". I haven tested 2.81 or latest build though.

Fri, Oct 11, 12:54 AM · Physics, BF Blender

Thu, Oct 10

Philipp Oeser (lichtwerk) added a revision to T70667: Playing animation (after deleting rigid body obj) crashes blender. (Different from the T70588 !): D6037: Fix T70667: crash playing animation (after deleting rigid body obj).
Thu, Oct 10, 1:44 PM · Physics, BF Blender
Philipp Oeser (lichtwerk) lowered the priority of T70667: Playing animation (after deleting rigid body obj) crashes blender. (Different from the T70588 !) from Needs Triage by Developer to Confirmed, Medium.

Confirmed, checking...

Thu, Oct 10, 1:00 PM · Physics, BF Blender
Philipp Oeser (lichtwerk) merged T70642: Bake All Dynamics not baking hair particles into T53083: Bake All Dynamics doesn't work when baking particle hair.
Thu, Oct 10, 11:55 AM · Physics, BF Blender
Philipp Oeser (lichtwerk) added a comment to T53083: Bake All Dynamics doesn't work when baking particle hair.

FYI, the skipping of hair particles with Bake All Dynamics was introduced in rB66918b3add4d.
On first sight, I dont see a particular reason to skip [tested non-skipping which seems to work], but this is ancient, so I guess this has never been considered a bug...

Thu, Oct 10, 10:44 AM · Physics, BF Blender

Wed, Oct 9

Michael George (benkyearn) added a comment to T70631: Cache of cloth simulation is not read by blender after reopening the file (pre-roll).

Well, I didn't know that the pre-roll feature was removed as I'm a beginner. So, I think it's better to show a warning message when someone tries to bake while entering a negative value. For me, the best thing is to make this feature work again. I know there might be programming limitations but the more features the software has, the better it will be.

Wed, Oct 9, 8:07 PM · Physics, BF Blender
Philipp Oeser (lichtwerk) renamed T70631: Cache of cloth simulation is not read by blender after reopening the file (pre-roll) from Cache of cloth simulation is not read by blender after reopening the file to Cache of cloth simulation is not read by blender after reopening the file (pre-roll).
Wed, Oct 9, 6:26 PM · Physics, BF Blender
Philipp Oeser (lichtwerk) lowered the priority of T70631: Cache of cloth simulation is not read by blender after reopening the file (pre-roll) from Needs Triage by Developer to Waiting for Developer to Reproduce.
Wed, Oct 9, 6:26 PM · Physics, BF Blender
Philipp Oeser (lichtwerk) renamed T70631: Cache of cloth simulation is not read by blender after reopening the file (pre-roll) from Chache of cloth simulation is not read by blender after reopening the file to Cache of cloth simulation is not read by blender after reopening the file.
Wed, Oct 9, 6:25 PM · Physics, BF Blender
Philipp Oeser (lichtwerk) added a project to T70631: Cache of cloth simulation is not read by blender after reopening the file (pre-roll): Physics.

This is tied to the simulation having a negative start frame.

Wed, Oct 9, 6:25 PM · Physics, BF Blender
Sebastian Villanueva (vr_sebas) added a watcher for Physics: Sebastian Villanueva (vr_sebas).
Wed, Oct 9, 7:28 AM

Tue, Oct 8

Dalai Felinto (dfelinto) added projects to T69578: Blender crash when playing with multiples metaballs particles system : Physics, Modeling.
Tue, Oct 8, 1:18 AM · Modeling, Physics, BF Blender (2.81)

Sat, Oct 5

john baker (jbaker8935) added a comment to T59995: Mantaflow Review.
Sat, Oct 5, 8:26 PM · Physics, BF Blender

Fri, Oct 4

Mark Spink (marks) added a comment to T70175: Mantaflow not using subframes for particle emitters in Gas sim.

Hello & thanks! (Sebbas) Downloaded the latest build last night from blender.org, much better!

Fri, Oct 4, 5:14 AM · Physics

Tue, Oct 1

Bastien Montagne (mont29) raised the priority of T69727: Dependency Cycle Detected when copying objects with cloth and collision modifier from Needs Information from User to Waiting for Developer to Reproduce.
Tue, Oct 1, 9:21 PM · Dependency Graph, Physics, BF Blender

Fri, Sep 27

Philipp Oeser (lichtwerk) added a revision to T69000: Hair: changing children related settings not updating in particle editmode (also crash when deleting a particle, then undo): D5914: Fix T69000: Hair: changing children related settings not updating in particle editmode.
Fri, Sep 27, 3:40 PM · Dependency Graph, Physics, BF Blender
Sebastián Barschkis (sebbas) added a comment to T70175: Mantaflow not using subframes for particle emitters in Gas sim.

The trails in the "with subframes" example seem to produce a "staircase" effect. Will investigate this further.

Fri, Sep 27, 3:04 PM · Physics
Sebastián Barschkis (sebbas) added a comment to T70176: Modifier added to object after mantaflow does not show in stack.

I think this issue resolved itseld with 0d31127d6ca2. Before that commit, some names were still old ("smoke" instead of "manta") and no additional modifiers could be added. So your bug was probably related to this.

Fri, Sep 27, 12:28 PM · Physics
Sebastián Barschkis (sebbas) added a comment to T70175: Mantaflow not using subframes for particle emitters in Gas sim.

Good catch, I was able to reproduce the issue. It seems there was an issue with the dependency graph. I made the particle emitter use the same setup as the mesh emitter and now I am able to generate decent smoke trails.

Fri, Sep 27, 11:45 AM · Physics

Thu, Sep 26

Philipp Oeser (lichtwerk) closed T68645: Hair Particle Edit - Particle Mirror Crash when children are visible in the viewport as Resolved by committing rBdb4571f3c331: Fix T68645: Hair Particle Edit - Particle Mirror crash when children are….
Thu, Sep 26, 5:38 PM · Physics, BF Blender

Wed, Sep 25

Sebastián Barschkis (sebbas) added a comment to T59995: Mantaflow Review.

Hi Gottfried!

Wed, Sep 25, 3:38 PM · Physics, BF Blender

Mon, Sep 23

Joseph Brandenburg (TheAngerSpecialist) added a comment to T68979: Decouple physics and animation clock.

I think this could be a great feature for animation, too, if you have a part of a rig that depends on a simulation. The cloth in a character's clothing could simulate while the animator is moving things, and stop when there's no transform going on. This would only give an idea of what the position of the cloth will be when baked, but it would be useful since you'd catch a lot of mistakes before a lengthy baking process.

Mon, Sep 23, 10:50 PM · Dependency Graph, Animation, Physics, BF Blender
Bastien Montagne (mont29) edited projects for T70175: Mantaflow not using subframes for particle emitters in Gas sim, added: Physics; removed BF Blender.
Mon, Sep 23, 6:20 PM · Physics
Bastien Montagne (mont29) edited projects for T70176: Modifier added to object after mantaflow does not show in stack, added: Physics; removed BF Blender.
Mon, Sep 23, 6:19 PM · Physics
Mark Spink (marks) added a comment to T70147: Mantaflow Gas sim does not use second emitter when third (particle) emitter added.

FYI: I made a couple of different sims yesterday- and neither did the above, so it's not happening every time.

Mon, Sep 23, 4:50 AM · Physics

Sun, Sep 22

Bastien Montagne (mont29) added a comment to T70133: 'Time'setting not seeming to affect noise speed in a Gas sim.

Note: removed the BF Blender tag, as this is not yet in official 'master' branch (still pending review).

Sun, Sep 22, 7:05 PM · Physics
Bastien Montagne (mont29) edited projects for T70133: 'Time'setting not seeming to affect noise speed in a Gas sim, added: Physics; removed BF Blender.
Sun, Sep 22, 7:04 PM · Physics
Bastien Montagne (mont29) edited projects for T70147: Mantaflow Gas sim does not use second emitter when third (particle) emitter added, added: Physics; removed BF Blender.
Sun, Sep 22, 7:03 PM · Physics
Gottfried Hofmann (gottfried) added a comment to T59995: Mantaflow Review.

I found another issue - here the fluid is has an offset to both the inflow and the collision object. The domain has been changed in edit mode:

Sun, Sep 22, 10:26 AM · Physics, BF Blender

Fri, Sep 20

Germano Cavalcante (mano-wii) lowered the priority of T69628: There's an undocumented nonsensical collections section in the rigid body options (just below the sensitivity settings) from Needs Triage by Developer to Confirmed, Medium.
Fri, Sep 20, 7:55 PM · Documentation, Physics, BF Blender
Jacques Lucke (JacquesLucke) updated subscribers of T69727: Dependency Cycle Detected when copying objects with cloth and collision modifier.

@Sergey Sharybin (sergey) is this a limitation of the cloth simulation?

Fri, Sep 20, 9:09 AM · Dependency Graph, Physics, BF Blender

Thu, Sep 19

Matthias Dorfelt (mokafolio) added a comment to T69727: Dependency Cycle Detected when copying objects with cloth and collision modifier.

Did this work in older versions of Blender? I'm not entirely sure which kinds of interactions the current cloth system supports.

Thu, Sep 19, 7:30 PM · Dependency Graph, Physics, BF Blender
Jacques Lucke (JacquesLucke) added projects to T69727: Dependency Cycle Detected when copying objects with cloth and collision modifier: Physics, Dependency Graph.

Did this work in older versions of Blender? I'm not entirely sure which kinds of interactions the current cloth system supports.

Thu, Sep 19, 5:29 PM · Dependency Graph, Physics, BF Blender

Wed, Sep 18

Dalai Felinto (dfelinto) updated subscribers of T69578: Blender crash when playing with multiples metaballs particles system .

@Sergey Sharybin (sergey) want to add this to the depsgraph bug fix guide? How to proceed for race conditions in the depsgraph evaluation?

Wed, Sep 18, 11:54 PM · Modeling, Physics, BF Blender (2.81)
Philipp Oeser (lichtwerk) added a comment to T69000: Hair: changing children related settings not updating in particle editmode (also crash when deleting a particle, then undo).

Note the crasher on delete, undo is also fixed by D5755: Fix T68645: Hair Particle Edit - Particle Mirror crash when children are visible in the viewport

Wed, Sep 18, 3:01 PM · Dependency Graph, Physics, BF Blender
Rosario Rosato (R2792) added a comment to T68981: New hair system.

You could integrate HairNet in Blender 2.81

Wed, Sep 18, 6:07 AM · Physics, BF Blender

Tue, Sep 17

Dalai Felinto (dfelinto) added a comment to T69578: Blender crash when playing with multiples metaballs particles system .

This actually seems a running condition issue, likely on depsgraph end.

Tue, Sep 17, 4:08 PM · Modeling, Physics, BF Blender (2.81)
Dalai Felinto (dfelinto) updated the task description for T69578: Blender crash when playing with multiples metaballs particles system .
Tue, Sep 17, 3:43 PM · Modeling, Physics, BF Blender (2.81)
Dalai Felinto (dfelinto) added projects to T69578: Blender crash when playing with multiples metaballs particles system : Modeling, Physics.

BLI_assert failed: //source/blender/blenkernel/intern/customdata.c:2099, CustomData_get_active_layer_index(), at 'customdata_typemap_is_valid(data)'
Full backtrace: P1102

Tue, Sep 17, 3:38 PM · Modeling, Physics, BF Blender (2.81)
Brecht Van Lommel (brecht) edited projects for T58044: Issue with rigid body and modifiers dependent on transform, added: BF Blender; removed BF Blender (2.81).

This needs bigger design changes to the dependency graph and physics, and while it would be good if we can, it is not a requirement to be fixed for 2.81.

Tue, Sep 17, 3:30 PM · BF Blender, Dependency Graph, Physics

Sep 13 2019

til ation (tilation) added a comment to T59995: Mantaflow Review.

while compiling die manta-flow branch on ubuntu 18.04 i get many errors. there are no errors when compling the masterbranch.
i added the terminalout in a text file.

Sep 13 2019, 9:51 PM · Physics, BF Blender

Sep 12 2019

Philipp Oeser (lichtwerk) merged task T69365: Problem with dynamic paint with a particle setting into T62882: Dynamic Paint weight paint mode not working?.
Sep 12 2019, 6:42 PM · Physics, BF Blender
Philipp Oeser (lichtwerk) added a comment to T69365: Problem with dynamic paint with a particle setting.

Note this has been reported before T62882: Dynamic Paint weight paint mode not working?, will merge these reports...

Sep 12 2019, 6:42 PM · Physics, BF Blender
Philipp Oeser (lichtwerk) added a comment to T68742: Dynamic Paint : Paint Surface Type Not working.

Note this has been reported before T62882: Dynamic Paint weight paint mode not working?, will merge these reports...

Sep 12 2019, 6:41 PM · Physics, BF Blender
Philipp Oeser (lichtwerk) merged task T68742: Dynamic Paint : Paint Surface Type Not working into T62882: Dynamic Paint weight paint mode not working?.
Sep 12 2019, 6:41 PM · Physics, BF Blender
Philipp Oeser (lichtwerk) added a comment to T68742: Dynamic Paint : Paint Surface Type Not working.

Note this has been reported before T62882: Dynamic Paint weight paint mode not working?, will merge these reports...

Sep 12 2019, 6:41 PM · Physics, BF Blender
Philipp Oeser (lichtwerk) added a project to T69365: Problem with dynamic paint with a particle setting: Physics.
Sep 12 2019, 6:34 PM · Physics, BF Blender
Philipp Oeser (lichtwerk) added a project to T68742: Dynamic Paint : Paint Surface Type Not working: Physics.
Sep 12 2019, 6:32 PM · Physics, BF Blender