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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

Thu, Oct 17

Jeroen Bakker (jbakker) closed D6076: Volumetric: Debug Voxel Size.
Thu, Oct 17, 12:18 PM · BF Blender (2.81), Physics, GPU / Viewport
Jeroen Bakker (jbakker) updated the diff for D6076: Volumetric: Debug Voxel Size.

Use uniform_copy

Thu, Oct 17, 12:13 PM · BF Blender (2.81), Physics, GPU / Viewport
Clément Foucault (fclem) added inline comments to D6076: Volumetric: Debug Voxel Size.
Thu, Oct 17, 12:08 PM · BF Blender (2.81), Physics, GPU / Viewport
Clément Foucault (fclem) accepted D6076: Volumetric: Debug Voxel Size.
Thu, Oct 17, 12:07 PM · BF Blender (2.81), Physics, GPU / Viewport
Jeroen Bakker (jbakker) requested review of D6076: Volumetric: Debug Voxel Size.

@Clément Foucault (fclem): mind having a second look at this patch :-) I just fixed a related issue T70868 :-)

Thu, Oct 17, 11:54 AM · BF Blender (2.81), Physics, GPU / Viewport
Jeroen Bakker (jbakker) updated the diff for D6076: Volumetric: Debug Voxel Size.

Velocity debugging

Thu, Oct 17, 11:52 AM · BF Blender (2.81), Physics, GPU / Viewport
Clément Foucault (fclem) accepted D6076: Volumetric: Debug Voxel Size.
Thu, Oct 17, 11:46 AM · BF Blender (2.81), Physics, GPU / Viewport
Sebastián Barschkis (sebbas) accepted D6076: Volumetric: Debug Voxel Size.

Perfect!

Thu, Oct 17, 10:24 AM · BF Blender (2.81), Physics, GPU / Viewport
Jeroen Bakker (jbakker) updated the diff for D6076: Volumetric: Debug Voxel Size.

Added the changes @Sebastián Barschkis (sebbas) proposed.

Thu, Oct 17, 10:09 AM · BF Blender (2.81), Physics, GPU / Viewport
Jeroen Bakker (jbakker) planned changes to D6076: Volumetric: Debug Voxel Size.

Yes, just noticed that the matrix needed more changes to work correct.

Thu, Oct 17, 10:03 AM · BF Blender (2.81), Physics, GPU / Viewport
Jeroen Bakker (jbakker) added a comment to T70868: Unexpected Behavior - Smoke domain does not match viewport container.

Cause is inside the volume_velocity_vert.glsl here it is assumed that the velocity texture has to be drawn around the center of the object.

Thu, Oct 17, 9:57 AM · Physics, BF Blender

Wed, Oct 16

Jeroen Bakker (jbakker) added a comment to T70868: Unexpected Behavior - Smoke domain does not match viewport container.

I can take a look at this one. Is more in my alley than the fragment shader

Wed, Oct 16, 10:56 PM · Physics, BF Blender
Germano Cavalcante (mano-wii) assigned T70868: Unexpected Behavior - Smoke domain does not match viewport container to Clément Foucault (fclem).

I can confirm.
As seen in the image attached by @Jacques Lucke (JacquesLucke), the needles indicating speed are partially out of the domain.

Wed, Oct 16, 10:51 PM · Physics, BF Blender
J. Kissel (Masterheavy) added a comment to T70868: Unexpected Behavior - Smoke domain does not match viewport container.

Jupp - Looks the same.
if you now center the origin, ist gone.

Wed, Oct 16, 4:00 PM · Physics, BF Blender
Jacques Lucke (JacquesLucke) lowered the priority of T70868: Unexpected Behavior - Smoke domain does not match viewport container from Needs Triage by Developer to Confirmed, Medium.

Don't know if this is the same issue, but I can confirm the issue described here.

Wed, Oct 16, 3:21 PM · Physics, BF Blender
Sebastián Barschkis (sebbas) added a comment to D6076: Volumetric: Debug Voxel Size.

Same as before. I just added a translation to the voxel indicator so that it stays inside the domain when resizes occur.

Wed, Oct 16, 12:17 PM · BF Blender (2.81), Physics, GPU / Viewport
Jeroen Bakker (jbakker) added a task to D6076: Volumetric: Debug Voxel Size: T70678: smoke sim glitch in solidmode.
Wed, Oct 16, 11:03 AM · BF Blender (2.81), Physics, GPU / Viewport
Jeroen Bakker (jbakker) added reviewers for D6076: Volumetric: Debug Voxel Size: Sebastián Barschkis (sebbas), Clément Foucault (fclem).
Wed, Oct 16, 11:03 AM · BF Blender (2.81), Physics, GPU / Viewport

Tue, Oct 15

Philipp Oeser (lichtwerk) closed T70667: Playing animation (after deleting rigid body obj) crashes blender. (Different from the T70588 !) as Resolved by committing rBd54ccb90ab57: Fix T70667: crash playing animation (after deleting rigid body obj).
Tue, Oct 15, 11:10 AM · Physics, BF Blender
Demeter Dzadik (Mets) added a comment to T70774: Hidden Particle paths draw solid [2.79 draws them half transparent].

Please adjust your attitude. The report was set to Confirmed status. He just said he's checking the issue.

Tue, Oct 15, 1:17 AM · GPU / Viewport, Physics, BF Blender

Mon, Oct 14

CHET (cheteron) added a comment to T70774: Hidden Particle paths draw solid [2.79 draws them half transparent].

Some excuses. In 2.79 it was a normal hide. Can you complete the task normally? It's 2019 year, and you say that it’s normally done, that's funny

Mon, Oct 14, 11:57 PM · GPU / Viewport, Physics, BF Blender
Philipp Oeser (lichtwerk) added projects to T70774: Hidden Particle paths draw solid [2.79 draws them half transparent]: Physics, GPU / Viewport.
Mon, Oct 14, 10:35 AM · GPU / Viewport, Physics, BF Blender

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