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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

Today

Aaron Carlisle (Blendify) closed T60963: Hair dynamics: hair dynamics not rendered in animation mode when using a force field as Resolved.

No activity for more than a week. As per the tracker policy we assume the issue is gone and can be closed.

Tue, Feb 18, 7:31 PM · Datablocks and Libraries, Physics, BF Blender
Aaron Carlisle (Blendify) changed the status of T73921: Eevee volume render test hang in Mantaflow from Needs Triage to Confirmed.
Tue, Feb 18, 5:58 PM · Physics, Nodes & Physics, BF Blender
Sebastian Parborg (zeddb) claimed T73057: Cloth Simulation Rig behaves like jelly/jello in 2.8 and behaves gently in 2.79.
Tue, Feb 18, 5:57 PM · BF Blender, Physics
Sebastian Parborg (zeddb) updated subscribers of T73057: Cloth Simulation Rig behaves like jelly/jello in 2.8 and behaves gently in 2.79.

This is because velocity dampening was removed during the big cloth cleanup/rewrite.

Tue, Feb 18, 5:55 PM · BF Blender, Physics
Elison G. Bradley (RaenirSalazar) added a comment to T73057: Cloth Simulation Rig behaves like jelly/jello in 2.8 and behaves gently in 2.79.

I can confirm that the simulation is a bit different in 2.79 vs latest master. I a simple keyframe animation to make the simulation more reproducable.
Notice how the object slows down much more quickly in 2.79.
I'm not sure if that qualifies as a bug. @Sebastian Parborg (zeddb), can this be related to your work on cloth?

Tue, Feb 18, 5:22 PM · BF Blender, Physics
Jacques Lucke (JacquesLucke) updated subscribers of T73057: Cloth Simulation Rig behaves like jelly/jello in 2.8 and behaves gently in 2.79.

I can confirm that the simulation is a bit different in 2.79 vs latest master. I a simple keyframe animation to make the simulation more reproducable.

Tue, Feb 18, 4:47 PM · BF Blender, Physics
Dalai Felinto (dfelinto) updated the task description for T66307: Nodes & Physics Module.
Tue, Feb 18, 2:51 PM · Nodes & Physics, Physics, Nodes, BF Blender
SlyNine (SlyNine) added a comment to T70175: Mantaflow not using subframes for particle emitters in Gas sim.

I'm still having issues. The smoke works fine by itself. But when I add fire I get this effect. The top one has sub-frames set to 200 while the bottom is default. It seems it's having an effect but I don't believe it's the desired effect.

Tue, Feb 18, 2:16 PM · BF Blender, Physics
Brecht Van Lommel (brecht) triaged T73626: Crash While Scrubbing Viewport render of fire sim as High priority.
Tue, Feb 18, 11:06 AM · Render & Cycles, Physics, BF Blender
Campbell Barton (campbellbarton) changed the status of T73951: Mantaflow Adaptive Domain Switch from Needs Triage to Needs Information from User.

This report is missing a blend file.

Tue, Feb 18, 5:24 AM · Physics, BF Blender
Aaron Carlisle (Blendify) closed T70147: Mantaflow Gas sim does not use second emitter when third (particle) emitter added as Resolved.
Tue, Feb 18, 1:34 AM · BF Blender, Physics
Aaron Carlisle (Blendify) closed T70175: Mantaflow not using subframes for particle emitters in Gas sim as Resolved.
Tue, Feb 18, 1:33 AM · BF Blender, Physics
Mark Spink (marks) added a comment to T70147: Mantaflow Gas sim does not use second emitter when third (particle) emitter added.

This looks OK in 2.82 as well-

Tue, Feb 18, 1:07 AM · BF Blender, Physics
Mark Spink (marks) added a comment to T70175: Mantaflow not using subframes for particle emitters in Gas sim.

Looks OK in 2.82 to me-

Particle emitter in foreground, mesh in background, both with 200 subframes set in emitter settings.

Tue, Feb 18, 12:54 AM · BF Blender, Physics

Yesterday

Aaron Carlisle (Blendify) added projects to T73951: Mantaflow Adaptive Domain Switch: BF Blender, Physics.
Mon, Feb 17, 11:59 PM · Physics, BF Blender
Aaron Carlisle (Blendify) added a project to T73057: Cloth Simulation Rig behaves like jelly/jello in 2.8 and behaves gently in 2.79: BF Blender.
Mon, Feb 17, 8:38 PM · BF Blender, Physics
Aaron Carlisle (Blendify) added a project to T70147: Mantaflow Gas sim does not use second emitter when third (particle) emitter added: BF Blender.
Mon, Feb 17, 8:29 PM · BF Blender, Physics
Aaron Carlisle (Blendify) added a project to T70175: Mantaflow not using subframes for particle emitters in Gas sim: BF Blender.
Mon, Feb 17, 8:25 PM · BF Blender, Physics
Aaron Carlisle (Blendify) changed the status of T70175: Mantaflow not using subframes for particle emitters in Gas sim from Needs Developer to Reproduce to Needs Information from User.

Is this still an issue with blender 2.82?

Mon, Feb 17, 8:25 PM · BF Blender, Physics
Sybren A. Stüvel (sybren) moved T56818: Hair Dynamics does not work for all strands when hair has been cut from Backlog to Known Issues on the Animation & Rigging board.
Mon, Feb 17, 6:13 PM · Physics, Animation & Rigging, BF Blender
Sybren A. Stüvel (sybren) moved T54108: Child Of vertex group fails when controled by Particle System from Backlog to Known Issues on the Animation & Rigging board.
Mon, Feb 17, 6:11 PM · Physics, Animation & Rigging, BF Blender
Sybren A. Stüvel (sybren) moved T69873: Keyframing object scale with object hair particles makes particles scale in viewport from Backlog to Known Issues on the Animation & Rigging board.
Mon, Feb 17, 6:03 PM · Animation & Rigging, Physics, BF Blender
Bastien Montagne (mont29) assigned T73837: Mantaflow: Effect of forces increases over time. to Sebastián Barschkis (sebbas).
Mon, Feb 17, 3:25 PM · Physics, Nodes & Physics, BF Blender
Brecht Van Lommel (brecht) assigned T73921: Eevee volume render test hang in Mantaflow to Sebastián Barschkis (sebbas).

Alternatively you can enable WITH_OPENGL_RENDER_TESTS and run ctest -R eevee.

Mon, Feb 17, 1:38 PM · Physics, Nodes & Physics, BF Blender

Sun, Feb 16

Mark Spink (marks) added a comment to T72214: Noise seems to break / negate pre-roll on smoke sim.

Hello, this still happens in the 2.82 release build-


Sun, Feb 16, 1:23 AM · Nodes & Physics, Physics, BF Blender
Mark Spink (marks) renamed T73232: Mantaflow: Adaptive Domain breaks Dissolve if 'slow' is checked from Mantaflow: Adaptive Domain breaks Dissolve to Mantaflow: Adaptive Domain breaks Dissolve if 'slow' is checked.
Sun, Feb 16, 1:03 AM · Nodes & Physics, Physics, BF Blender
Mark Spink (marks) added a comment to T73232: Mantaflow: Adaptive Domain breaks Dissolve if 'slow' is checked.

Hello, this still happens in the 2.82 release build-

Sun, Feb 16, 1:02 AM · Nodes & Physics, Physics, BF Blender

Sat, Feb 15

Evan Wilson (EAW) changed the status of T73837: Mantaflow: Effect of forces increases over time. from Needs Triage to Confirmed.

Confirmed using 2.82 release

Sat, Feb 15, 4:24 PM · Physics, Nodes & Physics, BF Blender

Fri, Feb 14

Sebastián Barschkis (sebbas) closed T73137: Release notes for Mantaflow as Resolved.
Fri, Feb 14, 7:19 PM · Physics, BF Blender (2.82)

Thu, Feb 13

Mark Spink (marks) added a comment to T73232: Mantaflow: Adaptive Domain breaks Dissolve if 'slow' is checked.

@Sebastián Barschkis (sebbas) Thanks! I shall be going dark until I install 2.82 release by the way (can't be arsed to download any more betas!)

Thu, Feb 13, 2:42 PM · Nodes & Physics, Physics, BF Blender
Mark Spink (marks) added a comment to T70133: 'Time'setting not seeming to affect noise speed in a Gas sim.

Shall do, I'm going dark somewhat till 2.82 is released (can't be arsed to download another beta if I can wait a day!)...

Thu, Feb 13, 2:27 PM · Tracker Curfew, Physics
Germano Cavalcante (mano-wii) added a revision to T58044: Issue with rigid body and modifiers dependent on transform: D6834: Fix bad sync between rigid bodies and modifiers.
Thu, Feb 13, 1:50 PM · Nodes & Physics, BF Blender, Dependency Graph, Physics
Germano Cavalcante (mano-wii) added a revision to T63238: Rigid Body does not interact with Soft Body in a simulation [worked in 2.79]: D6834: Fix bad sync between rigid bodies and modifiers.
Thu, Feb 13, 1:50 PM · Nodes & Physics, Physics, BF Blender
Germano Cavalcante (mano-wii) added a revision to T73000: Particle System on a Rigid Body object spawns incorrectly under specific conditions: with small particle number and different start frame.: D6834: Fix bad sync between rigid bodies and modifiers.
Thu, Feb 13, 1:50 PM · Nodes & Physics, Physics, BF Blender

Wed, Feb 12

Jacques Lucke (JacquesLucke) changed the status of T69065: Bug on Rigid Body Simulation when an object is parented to another from Needs Developer to Reproduce to Confirmed.

I set this as known issue, because it fixing it might require deeper changes to how Rigid Bodies are implemented in Blender and it is unlikely, that someone is fixing this in the next couple of month.

Wed, Feb 12, 3:25 PM · Dependency Graph, Physics, BF Blender
Aaron Carlisle (Blendify) closed T70133: 'Time'setting not seeming to affect noise speed in a Gas sim as Resolved.

Please submit a new bug if this is still an issue with blender 2.82

Wed, Feb 12, 7:06 AM · Tracker Curfew, Physics

Tue, Feb 11

Brecht Van Lommel (brecht) merged T73703: MantaFlow Mesh generation offset from particles into T72644: [Mantaflow] Wrong fluid mesh position.
Tue, Feb 11, 11:40 AM · Nodes & Physics, Physics, BF Blender

Mon, Feb 10

Aaron Carlisle (Blendify) closed T63606: Soft Body bake doesn't delete in "Disk Cache" mode as Resolved.

No activity for more than a week. As per the tracker policy we assume the issue is gone and can be closed.

Mon, Feb 10, 5:54 PM · Tracker Curfew, Physics, BF Blender
Aaron Carlisle (Blendify) moved T73617: Fluid Sim Improve UI from Backlog to UI Tweaks on the User Interface board.
Mon, Feb 10, 5:40 PM · Physics, User Interface, BF Blender
Richard Antalik (ISS) changed the subtype of T53226: Parented Rigid Body offsets on transform if the parent has been moved from "Report" to "Known Issue".
Mon, Feb 10, 5:08 PM · Dependency Graph, Physics, BF Blender
Richard Antalik (ISS) closed T64862: Changing Scale on Object doesn't affect Rigid Body as Resolved.

@Sergej Reich (sergof) if seems like the bodies are deactivated (even if the option is not used).
So when the scale changes, the rigid bodies needs to be nudged to have them react to the new collision boxes.

Mon, Feb 10, 2:23 PM · Physics, BF Blender
Sybren A. Stüvel (sybren) changed the subtype of T60945: Force field + hair dynamics not working in (linked) instanced collections from "Report" to "Bug".
Mon, Feb 10, 1:39 PM · Datablocks and Libraries, Physics, BF Blender
Sybren A. Stüvel (sybren) removed a project from T60945: Force field + hair dynamics not working in (linked) instanced collections: Tracker Curfew.

@Andrew Williams (sobakasu) Is this the same problem as T60963?

Mon, Feb 10, 1:37 PM · Datablocks and Libraries, Physics, BF Blender
Sybren A. Stüvel (sybren) changed the status of T60963: Hair dynamics: hair dynamics not rendered in animation mode when using a force field from Confirmed to Needs Information from User.

@Andrew Williams (sobakasu) Please simplify the example blend files. If linking is not part of the bug, please don't include that in the steps to reproduce and the example blend files.

Mon, Feb 10, 1:04 PM · Datablocks and Libraries, Physics, BF Blender
Germano Cavalcante (mano-wii) changed the status of T73653: Mantaflow: Calculate Replay Cache while only playing in a forward direction from Needs Triage to Confirmed.
Mon, Feb 10, 12:44 PM · Nodes & Physics, Physics, BF Blender

Sat, Feb 8

Aaron Carlisle (Blendify) updated the task description for T73617: Fluid Sim Improve UI.
Sat, Feb 8, 11:30 PM · Physics, User Interface, BF Blender
Aaron Carlisle (Blendify) updated the task description for T73617: Fluid Sim Improve UI.
Sat, Feb 8, 5:41 AM · Physics, User Interface, BF Blender
Aaron Carlisle (Blendify) updated the task description for T73617: Fluid Sim Improve UI.
Sat, Feb 8, 4:09 AM · Physics, User Interface, BF Blender

Fri, Feb 7

Brecht Van Lommel (brecht) removed reviewers for D6760: Mantaflow: remove reminents of high res smoke: Brecht Van Lommel (brecht), User Interface.

I'll leave this one for @Sebastián Barschkis (sebbas) to review as well, if it does nothing anymore than seems like a good idea to remove it.

Fri, Feb 7, 7:27 PM · Physics, User Interface, BF Blender
Brecht Van Lommel (brecht) removed a reviewer for D6770: Mantaflow: Remove Noise Type Option: Brecht Van Lommel (brecht).

Fine with me if it's not supported, I'll leave it to @Sebastián Barschkis (sebbas) to check the correctness of this patch.

Fri, Feb 7, 6:40 PM · Physics, BF Blender