PhysicsProject
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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

Sun, Aug 20

Aaron Carlisle (Blendify) added a project to T52238: Gravity ignores units scale: Physics.
Sun, Aug 20, 7:23 AM · Physics, BF Blender

Fri, Jul 28

Luca Rood (LucaRood) closed T52156: Particle simulation doesn't work after adding a texture to the particle system as "Resolved" by committing rB9b22dbcc0d05: Fix T52156: Hair dynamics broken with density texture.
Fri, Jul 28, 3:37 PM · Physics, BF Blender

Jul 24 2017

Andreas Halm (Tropics) added a comment to T52156: Particle simulation doesn't work after adding a texture to the particle system.

This might not be the right place to discuss. However, I don't really understand this:
If you have added a texture to a particle (hair) system, and you hit 'Bake', you get an 'empty bake', that is a simulation doing nothing. Ignoring all fields you have added. Without any warning or notice, that you have to remove the texture again before you can get a usable result. To be more clear, you get an 'erroneous result' without any hint why. This is considered a limitation?

Jul 24 2017, 10:59 PM · Physics, BF Blender

Jul 23 2017

ronan ducluzeau (zeauro) added a comment to T52156: Particle simulation doesn't work after adding a texture to the particle system.

Yes. It is an already reported problem. Not really a bug but a known limitation.

Jul 23 2017, 3:50 PM · Physics, BF Blender

Jul 22 2017

Andreas Halm (Tropics) created T52156: Particle simulation doesn't work after adding a texture to the particle system.
Jul 22 2017, 11:06 PM · Physics, BF Blender

Jul 11 2017

Bogumił (BogumilZ) added a comment to T51147: Fluid simulation - inflow - export animated mesh bug.

Is it fixable in future blender releases?

Jul 11 2017, 11:31 AM · Physics, BF Blender

Jul 10 2017

gimble (gimble) added a comment to T51147: Fluid simulation - inflow - export animated mesh bug.

Perhaps this is related to a couple of the "archived" bug reports?

Jul 10 2017, 4:21 AM · Physics, BF Blender

Jul 5 2017

lucas veber (lucky3) added a comment to T51759: Fluid simulation. An outflow mesh doesn't remove additional fluid mesh (Generated by Fluid Particles option).

Thank you Brecht! This being my first blender patch, I feel very proud :-)
Cheers

Jul 5 2017, 11:26 PM · Physics, BF Blender
Bogumił (BogumilZ) added a comment to T51147: Fluid simulation - inflow - export animated mesh bug.

Finally someone noticed! ^_^

Jul 5 2017, 6:55 PM · Physics, BF Blender
Luca Rood (LucaRood) added a comment to T51147: Fluid simulation - inflow - export animated mesh bug.

Hm, seems the issues here go much further than described. Besides not generating consistent amounts of fluid, the animated version causes the fluid to have a gigantic cavity, essentially turning it into a hollow "shell" of fluid.
From a quick look at the code I didn't get to any conclusion, but then again, I'm not familiar with the Elbeem code at all. This will require some more digging.

Jul 5 2017, 5:41 PM · Physics, BF Blender

Jul 4 2017

Bastien Montagne (mont29) assigned T51147: Fluid simulation - inflow - export animated mesh bug to Luca Rood (LucaRood).

Yeah, there is a weird difference between animated and non-animated inflow mesh here, not sure why… Maybe our emeritus physicist @Luca Rood (LucaRood) wants to have a look? ;)

Jul 4 2017, 5:29 PM · Physics, BF Blender

Jul 2 2017

Brecht Van Lommel (brecht) added a comment to T51759: Fluid simulation. An outflow mesh doesn't remove additional fluid mesh (Generated by Fluid Particles option).

Claiming the task is fine, patch committed now.

Jul 2 2017, 10:51 PM · Physics, BF Blender
Brecht Van Lommel (brecht) closed T51759: Fluid simulation. An outflow mesh doesn't remove additional fluid mesh (Generated by Fluid Particles option) as "Resolved" by committing rB405121d61368: Fix T51759: fluid simulation particles not remoevd when colliding with outflow….
Jul 2 2017, 10:51 PM · Physics, BF Blender

Jun 30 2017

Luca Rood (LucaRood) closed D2458: Fix T50230: Rigid Body simulation shouldn't step when time is beyond cached area by committing rB9cd6b03187b9: Fix T50230: Rigid Body simulation shouldn't step when time is beyond cached area.
Jun 30 2017, 4:02 PM · Physics
Campbell Barton (campbellbarton) closed T50887: fluid simulation: generate mesh bug as "Resolved" by committing rB9c2bbfb6ce90: Fix T50887: Holes in fluid mesh on Windows.
Jun 30 2017, 3:41 AM · Physics, BF Blender

Jun 26 2017

Aaron Carlisle (Blendify) triaged T51759: Fluid simulation. An outflow mesh doesn't remove additional fluid mesh (Generated by Fluid Particles option) as "Confirmed" priority.
Jun 26 2017, 5:38 AM · Physics, BF Blender

Jun 24 2017

Acorn Bits (AcornBits) added a comment to T50887: fluid simulation: generate mesh bug.

It is happening for us all the time, in more than 10 frames out of 180 of a simulation (resolution 550, smoothing 1, remove air bubbles Yes, speed 0.8).

Jun 24 2017, 9:58 PM · Physics, BF Blender

Jun 23 2017

Sebastián Barschkis (sebbas) closed T51837: Mantaflow fluid crashes as "Resolved".

Okay, here is what happened:

  1. The "crash" occurred only in Debug build configuration.
  2. When reading particle velocities from disk, the number of particles from the file header were not considered. They were only set in the particle system (positions, flags) reading routine. It's apparently safer to read them twice.
Jun 23 2017, 9:54 PM · Physics

Jun 21 2017

lucas veber (lucky3) added a comment to T51759: Fluid simulation. An outflow mesh doesn't remove additional fluid mesh (Generated by Fluid Particles option).

Here is the patch:
https://developer.blender.org/D2719

Jun 21 2017, 9:30 PM · Physics, BF Blender
lucas veber (lucky3) claimed T51759: Fluid simulation. An outflow mesh doesn't remove additional fluid mesh (Generated by Fluid Particles option).

Sorry it's my first bug fixing time, i'm not sure to do it right.
I have a patch for this, can I claim this task?

Jun 21 2017, 8:50 PM · Physics, BF Blender
Sebastián Barschkis (sebbas) added a comment to T51837: Mantaflow fluid crashes.

Yeah, I'm on it. Just couldn't reproduce the "instant crash" on neither Linux nor OSX. So it's either really a Windows problem or a faulty build.

Jun 21 2017, 3:27 PM · Physics
Bastien Montagne (mont29) triaged T51837: Mantaflow fluid crashes as "Normal" priority.

Ideally would be better to communicate directly with the branch's author in that kind of cases… Will let @Sebastián Barschkis (sebbas) decide now.

Jun 21 2017, 12:36 PM · Physics
Bastien Montagne (mont29) removed a project from T51837: Mantaflow fluid crashes: BF Blender.
Jun 21 2017, 12:35 PM · Physics

Jun 19 2017

Bastien Montagne (mont29) closed T51774: Children particles hair interpolation not correct with textures or dp as "Resolved" by committing rB3190eaf10942: Fix T51774: Children particles hair interpolation not correct with textures or….
Jun 19 2017, 12:05 AM · Physics, BF Blender

Jun 18 2017

mic lack30 (miclack) assigned T51837: Mantaflow fluid crashes to Sebastián Barschkis (sebbas).
Jun 18 2017, 11:53 AM · Physics
mic lack30 (miclack) created T51837: Mantaflow fluid crashes.
Jun 18 2017, 11:53 AM · Physics
Felix (BlenderSpot) renamed T51759: Fluid simulation. An outflow mesh doesn't remove additional fluid mesh (Generated by Fluid Particles option) from "Physics: Fluid simulation. An outflow mesh doesn't remove additional, fluid mesh (fluid particles) that hits it. " to "Fluid simulation. An outflow mesh doesn't remove additional fluid mesh (Generated by Fluid Particles option)".
Jun 18 2017, 5:44 AM · Physics, BF Blender

Jun 17 2017

Brecht Van Lommel (brecht) closed T51826: Fluid contour in final render is different from viewport preview as "Invalid".

In the fluid domain settings, there's different Final Display and Viewport Display modes. If those match the result is the same.

Jun 17 2017, 6:38 PM · Physics, Rendering, BF Blender

Jun 16 2017

Bastien Montagne (mont29) triaged T51774: Children particles hair interpolation not correct with textures or dp as "Confirmed" priority.
Jun 16 2017, 10:57 PM · Physics, BF Blender
Serge Lyatin (SergeL) created T51826: Fluid contour in final render is different from viewport preview.
Jun 16 2017, 6:15 PM · Physics, Rendering, BF Blender

Jun 13 2017

Howard Matthews (howiem) added a comment to T51302: "Boid" Force field does nothing; should be removed.

OK: I've finally found some time to write some better documentation for this, but it'd be useful to check if this is correct. It seems:

Jun 13 2017, 9:08 AM · Physics, BF Blender

Jun 10 2017

Felix (BlenderSpot) edited the description of T51759: Fluid simulation. An outflow mesh doesn't remove additional fluid mesh (Generated by Fluid Particles option).
Jun 10 2017, 8:58 PM · Physics, BF Blender

Jun 9 2017

Felix (BlenderSpot) edited the description of T51759: Fluid simulation. An outflow mesh doesn't remove additional fluid mesh (Generated by Fluid Particles option).
Jun 9 2017, 6:42 PM · Physics, BF Blender
Felix (BlenderSpot) created T51759: Fluid simulation. An outflow mesh doesn't remove additional fluid mesh (Generated by Fluid Particles option).
Jun 9 2017, 7:13 AM · Physics, BF Blender

Jun 6 2017

Manu Marin (gyakoo) added a watcher for Physics: Manu Marin (gyakoo).
Jun 6 2017, 4:35 PM
Luca Rood (LucaRood) closed T50896: Particles behave differently in rendered animation than in viewport as "Archived".

This is an odd behavior indeed. Might be a mesh evaluation order issue...
However particles are subject to an overhaul in 2.8, so we are limiting the work on the current system to only regressions.
Thanks for the report, but as this is not a regression, archiving it for now.

Jun 6 2017, 11:55 AM · Physics, BF Blender

May 29 2017

Bastien Montagne (mont29) closed T51390: Blender 2 .78c will freeze or force close when adding particles at random. as "Resolved" by committing rB06ca2c9d0320: Fix T51390: Blender 2.78c will freeze or force close when adding particles at….
May 29 2017, 4:12 PM · Physics, BF Blender
Bastien Montagne (mont29) claimed T51390: Blender 2 .78c will freeze or force close when adding particles at random..

Confirmed, issue is in DM evaluation code actually, never clears the deformedOnly flag when evaluating a generative modifier!!!

May 29 2017, 4:07 PM · Physics, BF Blender

May 22 2017

Bastien Montagne (mont29) merged task T51111: Using an added Cube in combination with Particles > Volume > Grid results in missing particles. into T51332: Startup cube does not match other cubes' geometry - need to update startup file.
May 22 2017, 11:13 PM · Physics, BF Blender

May 15 2017

Aaron Carlisle (Blendify) closed T51297: Use A Higher Hair Segment Limit as "Resolved" by committing rB4621583612fa: Fix T51297: Use A Higher Hair Segment Limit.
May 15 2017, 8:30 PM · User Interface, Physics, BF Blender

May 14 2017

gimble (gimble) edited the description of T51111: Using an added Cube in combination with Particles > Volume > Grid results in missing particles..
May 14 2017, 5:33 PM · Physics, BF Blender
gimble (gimble) edited the description of T51111: Using an added Cube in combination with Particles > Volume > Grid results in missing particles..
May 14 2017, 5:31 PM · Physics, BF Blender

May 10 2017

Leon Cheung (leon_cheung) added a comment to T51297: Use A Higher Hair Segment Limit.

Very nice solution, Aaron! ❤

May 10 2017, 4:59 AM · User Interface, Physics, BF Blender
Aaron Carlisle (Blendify) raised the priority of T51297: Use A Higher Hair Segment Limit from "Normal" to "Confirmed".
May 10 2017, 4:53 AM · User Interface, Physics, BF Blender
Aaron Carlisle (Blendify) added a comment to T51297: Use A Higher Hair Segment Limit.

Here is a fix which uses a soft limit of 50 and a hard limit of 128:

May 10 2017, 4:53 AM · User Interface, Physics, BF Blender

May 5 2017

Dimitar Pouchnikov (dimitarsp) added a comment to T44248: Dupligroup instances of particles instancing groups do not render in Blender Internal, but show fine in Viewport and Cycles.

I have observed the same bug. I guess it sill hasn't been addressed?

May 5 2017, 4:26 PM · Rendering, Physics, BF Blender
Bogumił (BogumilZ) added a comment to T51147: Fluid simulation - inflow - export animated mesh bug.

All I want to achieve is to fluid inflow object emit fluid the same way on animated mesh as on non animated mesh. I already tried the displacement and ocean modifier, looks good but I wanted drops dripping from running character. As soon as I tick option "export animated mesh" inflow emits enormous amounts of fluid. Is there a way to make deformed mesh emit fluid like non deformed (not animated)?

May 5 2017, 11:10 AM · Physics, BF Blender
Aaron Carlisle (Blendify) moved T51390: Blender 2 .78c will freeze or force close when adding particles at random. from Backlog to Particles on the Physics board.
May 5 2017, 12:16 AM · Physics, BF Blender
Aaron Carlisle (Blendify) assigned T51390: Blender 2 .78c will freeze or force close when adding particles at random. to Luca Rood (LucaRood).
May 5 2017, 12:16 AM · Physics, BF Blender

Apr 30 2017

Howard Matthews (howiem) added a comment to T51302: "Boid" Force field does nothing; should be removed.

Thought: perhaps renaming it to Boid Goal/Avoid field would help.

Apr 30 2017, 12:25 PM · Physics, BF Blender